LDU Load Cell Digitizing Unit Technical Manual

Transcription

1 LDU 79. Load Cell Digitizing Unit Technical Manual Flintec GmbH Bemannsbruch Meckesheim GERMANY

2 Table of Contents:. Safety Instructions Declaration of Conformity Intduction and Specifications Communications and Getting started Serial Interface Command Language Baud Rate Getting Started Hardware and Wiring Wiring Terminal Configuration Load Cell Connection Serial Port Connection CAN Connection CANopen interface General The PDOs The SDOs Communication Pfile Object Directory Commands Overview Commands Description System Diagnosis Commands ID, IV, IS, SR, RS ID Get Device Identity IV Get Firmware Version IS Get Device Status SR Software Reset RS Read Serial Number Calibration Commands CE, CM n, CI, MR, DS, DP, CZ, CG, ZT, FD, IZ, ZR, ZI, TM, TN, ZN, AZ, AG, CS CE Read TAC* Counter / Open Calibration Sequence CM n Set Maximum Output Value CI Set Minimum Output Value MR Set Multirange / Multiinterval DS Set Display Step Size DP Set Decimal Point Position CZ Set Calibration Ze Point CG Set Calibration Gain (Span) ZT Enable / Disable Ze Tracking FD Reset to Factory Default Settings IZ Correction of System Ze ZR Ze Range ZI Initial Ze Range TM Tare mode TN Set / Clear NonVolatile Tare ZN Set / Clear NonVolatile Ze AZ Absolute ze point calibration (ecal) AG Absolute gain calibration (ecal) CS Save the Calibration Data Motion Detection Commands NR, NT NR Set Nomotion Range NT Set Nomotion Time Filter Setting Commands FM, FL, UR... 8 LDU 79. Technical Manual Rev.. January 7 Page of 46

3 8.4.. FM Filter Mode FL Filter setting UR Update Rate and Averaging Taring and Zeing Commands SZ, ZA, RZ, ST, RT, SP SZ Set System Ze ZA Set Averaged System Ze RZ Reset Ze ST Set Tare RT Reset Tare SP Set Preset Tare Output Commands GG, GN, GT, GS, GW, GA, GL, OF GG Get Gss Value GN Get Net Value GT Get Tare Value GS Get ADC Sample Value GW Get Data String Net, Gss and Status GA Get Triggered Average Value GL Get Data String Average, Gss and Status OF Output Format for Data String GW and GL Auto transmit Commands SG, SN, SX, SA, SL SG Send Gss Value continuously SN Send Net Value continuously SX Send ADC Sample Value continuously SA Send Triggered Average Value automatically SL Send Data String Average, Gss and Status automatically Commands for External I/O Contl IN, IO and OM IN Read status of the logic inputs IO Read / modify the status of the logic outputs OM Contl of the logic outputs by the host application Setpoint Output Commands S n, H n, A n, HT S n Setpoint Value H n Hysteresis and Switching Action for a Setpoint A n Allocation source for a Setpoint HT Hold time for all Setpoints Communication Setup Commands AD, NA, NS, BR, DX AD Device Address Serial channel NA Network Address CAN NS Network Settings CAN BR Baud Rate Serial channel DX Full Duplex Serial channel Save Calibration and Setup Data Commands CS, WP, SS, GI, PI CS Save the Calibration Data WP Save the Setup Parameters SS Save Setpoint Parameters GI Get an Image File fm the EEPROM PI Download an Image File to the EEPROM Trigger Commands SD, MT, GA, TE, TR, TL, SA SD Start Delay Time MT Measuring Time GA Get Triggered Average Value TE Trigger Edge TR Software Trigger TL Trigger Level SA Send Triggered Average Value automatically ReTrigger Commands RW, TT, TS, DT, TW and TI RW Trigger Window for ReTrigger Function TT Averaging Time for Retrigger Function TS Stop Value for Retrigger Function DT Shorttime Averaging Period TW Window for Automatic Taring TI Averaging Time for Automatic Taring Use in Appved Applications LDU 79. Technical Manual Rev.. January 7 Page of 46

4 RIGHTS AND LIABILITIES All rights reserved. No part of this publication may be repduced, stored in a retrieval system, or transmitted in any form or by any means, mechanical, photocopying, recording, or otherwise, without the prior written permission of Flintec GmbH. No patent liability is assumed with respect to the use of the information contained herein. While every precaution has been taken in the preparation of this book, Flintec GmbH assumes no responsibility for errs or omissions. Neither is any liability assumed for damages resulting fm the use of the information contained herein. The information herein is believed to be both accurate and reliable. Flintec GmbH, however, would be obliged to be informed if any errs occur. Flintec GmbH cannot accept any liability for direct or indirect damages resulting fm the use of this manual. Flintec GmbH reserves the right to revise this manual and alter its content without notification at any time. Neither Flintec GmbH nor its affiliates shall be liable to the purchaser of this pduct or third parties for damages, losses, costs, or expenses incurred by purchaser or third parties as a result of: accident, misuse, or abuse of this pduct or unauthorized modifications, repairs, or alterations to this pduct, or failure to strictly comply with Flintec GmbH operating and maintenance instructions. Flintec GmbH shall not be liable against any damages or pblems arising fm the use of any options or any consumable pducts other than those designated as Original Flintec GmbH Pducts. NOTICE: The contents of this manual are subject to change without notice. Copyright 6 by Flintec GmbH, D7499 Meckesheim, Germany. Safety Instructions CAUTION READ this manual BEFORE operating or servicing this equipment. FOLLOW these instructions carefully. SAVE this manual for future reference. DO NOT allow untrained personnel to operate, clean, inspect, maintain, service, or tamper with this equipment. ALWAYS DISCONNECT this equipment fm the power source before cleaning or performing maintenance. CALL Flintec GmbH for parts, information, and service. WARNING ONLY PERMIT QUALIFIED PERSONNEL TO SERVICE THIS EQUIPMENT. EXERCISE CARE WHEN MAKING CHECKS, TESTS AND ADJUSTMENTS THAT MUST BE MADE WITH POWER ON. FAILING TO OBSERVE THESE PRECAUTIONS CAN RESULT IN BODILY HARM. WARNING FOR CONTINUED PROTECTION AGAINST SHOCK HAZARD CONNECT TO PROPERLY GROUNDED OUTLET ONLY. DO NOT REMOVE THE GROUND PRONG. WARNING SERVICING. DISCONNECT ALL POWER TO THIS UNIT BEFORE REMOVING THE FUSE OR WARNING BEFORE CONNECTING/DISCONNECTING ANY INTERNAL ELECTRONIC COMPONENTS OR INTERCONNECTING WIRING BETWEEN ELECTRONIC EQUIPMENT ALWAYS REMOVE POWER AND WAIT AT LEAST THIRTY (3) SECONDS BEFORE ANY CONNECTIONS OR DISCONNECTIONS ARE MADE. FAILURE TO OBSERVE THESE PRECAUTIONS COULD RESULT IN DAMAGE TO OR DESTRUCTION OF THE EQUIPMENT OR BODILY HARM. CAUTION DEVICES. OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

5 . Declaration of Conformity EUKonformitätserklärung EUDeclaration of Conformity Monat/Jahr: month/year: 8/6 Hersteller: Manufacturer: Flintec GmbH Anschrift: Address: Bemannsbruch 9 D7499 Meckesheim Deutschland / Germany Pduktbezeichnung: Pduct name: LDU 79. Das bezeichnete Pdukt stimmt mit folgenden Vorschriften der Eupäischen Richtlinien überein: This pduct confirms with the following regulations of the Directives of the Eupean Community Richtlinie 4/3/EU des Eupäischen Parlaments und des Rates vom 6. Februar 4 zur Angleichung der Rechtsvorschriften der Mitgliedstaaten über die elektmagnetische Verträglichkeit und zur Aufhebung der Richtlinie 4/8/EG. Richtlinie 4/35/EU NiederspannungsRichtlinie Die Absicherung aller pduktspezifischen Qualitätsmerkmale erfolgt auf Basis eines zertifizierten QualitätsmanagementSystems nach DIN ISO 9. Diese Erklärung bescheinigt die Übereinstimmung mit den genannten Richtlinien, beinhaltet jedoch keine Zusicherung von Eigenschaften. Directive 4/3/EU of the Eupean Parliament and of the Council of 6th February 4 on the appximation of the laws of the Member States relating to electmagnetic compatibility and repealing Directive 4/8/EC. Directive 4/35/EU Low Voltage Directive All pductrelated features are assured by a quality system in accordance with ISO 9. This declaration certifies the conformity with the listed directives, but it is no pmise of characteristics. Folgende Normen werden zum Nachweis der Übereinstimmung mit den Richtlinien eingehalten: As a pof of conformity with the directives following standards are fulfilled: OIML R76 NichtSelbsttätig Waagen Metlogische und technische Anforderungen (OIML R76:6 Teil ) Nonautomatic weighing systems Metlogical and technical requirements (OIML R76:6 Part ) DIN EN 445 Metlogische Aspekte nichtselbsttätiger Waagen; Deutsche Fassung EN 455:5 Metlogical aspects of nonautomatic weighing instruments; German version EN 455:5 Anhang B.3: Funktionsprüfungen unter Störeinflüssen / Annex B3 Performance tests for disturbances. LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

6 3. Intduction and Specifications The model LDU 79. is a very precise highspeed digital amplifier for weighing and force measurements with strain gauge (SG) sensors. The LDU 79. can be used in legal for trade as well as for industrial applications. The device features a CAN interface with support for the CAN Open ptocol as well as a full duplex RS3 interface using a straightforward ASCII command set. The LDU 79. and the well known LDU 78., both use nearly the same command set. The LDU 79. with its accurate A to D converter and a sample rate of up to measurement values per second is particularly suitable for static or dynamic measurements and contl purposes. Specifications Accuracy class III or IIII Maximum number of verification scale intervals (n) for class III, for class IIII Minimum input voltage per VSI µv. Measuring range (FS) mv/v ±3.3 Maximum resolution at FS (appx.) incr ±88 Measuring rate Hz 9.4 to Digital filter cutoff frequency (3dB) Hz.5 to 8 Bridge excitation voltage V DC 5 Maximum bridge excitation current ma 5 Load cell cable length (for n = ) m/mm 934 Maximum resistance per wire (for n = ) Ω 49.6 Linearity err (relative to full scale) % ±.5 Temperature effect on ze (relative to full scale) %/ K ±.3 (Typical) Temperature effect on span %/ K ±. (Typical) Interface CAN Bit rate kbits/s to Ptocol CAN Open Interface RS3 Baud rate bits/s 96 to 468 Frame format 8 data bits, stop bit, no parity bits Ptocol Readable ASCII Logical inputs Maximum input voltage V DC 3 Threshold voltage (appx.) V DC 6 Input resistance (appx.) kω 8 Logical outputs Maximum voltage V DC 3 Maximum current A.5 Supply voltage V DC to 3 Power consumption (without load cells) mw <5 Operating temperature range C 5 to +55 Storage temperature range C 3 to +7 Dimensions (LxWxH) excluding pins mm 8.3 x 3.7 x 6.5 Weight g 8 Ptection IP LDU 79. Technical Manual Rev.. January 7 Page 5 of 46

7 4. Communications and Getting started 4.. Serial Interface Communicating with the LDU 79. digitizer is carried out via serial RS 3 port. The data format is the familiar 8/N/ structure (8 data bits, no parity, stop bit). Available baud rates via the RS3 port are as follows: 96, 9, 384, 576, 5, 34 and 468 baud. Factory default: 5 baud 4.. Command Language The command set of the LDU 79. is based on a simple ASCII format ( letters). This enables the user to setup the device, get results or check parameters. Example: LDU 79. is connected via the RS3 port to a PC / PLC system. You want to get the identity, firmware version or net weight. Remark: In this manual means: Space _ and Enter (CR/LF) ID D:79 Identity of the device IV V:7 Firmware version of the device GN N Net weight with algebraic sign/floating point 4.3. Baud Rate For baud rate setup use command BR, see chapter..3 Factory default: 5 baud 4.4. Getting Started You will require: PC or PLC with a RS3 communication port A load cell / scale with test weights or a load cell simulator A 4 VDC power supply capable of delivering appximately ma One or more LDU 79. A suitable ASCII communication software ** Refer to the following wiring diagram in chapter 5. ** You can easily communicate between a PC and a LDU 79. using pgrams such as Pcomm, Telemate, Kermit, HyperTerminal or HTerm etc. Additional the powerful software DOP 4 with graphical user interface and oscilloscope function for the operating systems Windows XP / Vista / 7 / 8 / is available. LDU 79. Technical Manual Rev.. January 7 Page 6 of 46

8 5. Hardware and Wiring 5.. Wiring Colour code of standard Flintec load cells 5.. Terminal Configuration LDU 79. Pin no. Shield Load cell + Excitation + Sense 3 + Signal 4 Signal 5 Sense 6 Excitation 7 Shield 8 NC 9 NC LDU 79. Pin no. Pin Function TxD RS3 TxD RxD RS3 RxD CAN_L CAN line low 3 CAN_H CAN line high 4 In Logical input 5 Out Logical output 6 In Logical input 7 Out Logical output 8 + PWR Power supply VDC 9 Gnd Power supply / RS3 / CAN 5.3. Load Cell Connection The load cell wiring should be made carefully before applying power to avoid damages to the amplifier and the load cells. The input resistance of the load cells that you want to connect should be 43 Ω (ohms). In case of a four wire load cell the sense wires must be connected to the excitation i.e. pin to pin and pin 5 to pin Serial Port Connection The RS3 port can be used for communication with a PC, PLC system or other devices. The GND terminal (pin 9) must be used as signal gund for the RS3 interface CAN Connection The CAN lines can be connected to a CANopen master. Termination resistors must be present in the CAN network but there is no such resistors inside the LDU. The GND terminal (pin 9) must be used as signal gund for the CAN interface. LDU 79. Technical Manual Rev.. January 7 Page 7 of 46

9 6 CANopen interface 6. General The CAN interface follows the CAN.B recommendations. It receives both bit identifiers, and tolerates 9 bit identifiers. It only transmits bit identifiers. The CAN rate is setup as default to 5 kbit/s. The LDU is always quiet on the CAN bus until the NMT Start command is received, except for the very first node guard message. When started by the NMT Start the LDU 79. starts transmitting TPDO messages with weight and status. The default is the net value. When filling is in pgress the gateway transmits a TPDO every time a module changes state to wait for trigger. This TDPO contains the module number, the module status and the dosed weight. In checkweigher applications the TPDO is used to send triggered measurements. With RDPO frames you can send simple commands without an acknowledgement. The functions are: select gss or net value in TPDO, set or clear system ze, set or clear tare. With RPDO frames you can send triggers or stop triggers. For the filling application the trigger can be used to start the filling cycle. On checkweigher applications the trigger can start measurements and a stoptrigger will stop further internal retriggers. In case of an overrun, err or failure an EMERGENCY message is sent to the CAN contller indicating the nature of the err or failure. RPDO3 and RPDO4 are ignored by the LDU. SDOs are handled according to pfile and CANopen recommendation. The LDU supports both node guarding and heart beat. LDU 79. Technical Manual Rev.. January 7 Page 8 of 46

10 6. The PDOs The Weight and status is sent using TPDO. One TPDO is sent each time a new measurement is ready. The high measuring rate of the LDU 79. will result in appx. TPDO s per second. If the system can t handle so many messages the update rate can be reduced see the UR command. The TPDO is sent when an average measurement is ready. The TPDO has the same format as TPDO. The TPDO3 is sent when the tare changes. It has the same format as TPDO. The format of the TPDO, TPDO and TPDO3 is: 3 bit 6 Bit 8 bits 8 Bit Weight Status The first field is a single precision float value carrying weight information, gss or net value if it is a TDPO, average weight if it is a TPDO and tare value if it is a TPDO3. Then status follows as a 6 bit field with the following values defined: $ Under range, $ Over range, $8 Center ze, $ No motion, $ Tare set, $8 ADC Err, $ Setpoint (source>limit), $ Setpoint, TPDO Weight values are available at all times The following table shows the information of TPDO: 3 bit 6 bit 8 bit 8 bit Weight Module Status Default: Net weight. Refresh time: Contlled by the setup of command UR. Format: Floating point single precision (IEEE 754) TPDO Average weight GA is available and refreshes when a new measurement is ready. TPDO3 Tare weight GT is available and refreshes when a new tare value is set. RPDO The following commands can be executed direct: bit7 bit6 bit5 bit4 bit3 bit bit bit SG SN ST RT SZ RZ Examples: Setting tare: Transmit RPDO [8] Setting gss weight in TPDO: Transmit RPDO [8] LDU 79. Technical Manual Rev.. January 7 Page 9 of 46

11 RPDO The following commands can be executed direct: bit7 bit6 bit5 bit4 bit3 bit bit bit TR 8 Example: Setting trigger start: Transmit RPDO [8] 6.3 The SDOs The CANopen SDOs is a confirmed service, and overrun does not occur if the CAN contller only communicates with the LDU in the PREOPERATIONAL state. When a SDO has been received by the contller no further communication takes place until the service has been acknowledged (or a timeout occurs). SDO s Are only available on request See tables 6.5 Object Directory Can be used for complete setup of the LDU 79. via CAN bus master, e.g: Filter setting: Index, Subindex 4 Filter Mode setting: Index, Subindex 9 Can be used to get information regarding all the commands available, e.g: Net weight: Index 9, Subindex AD sample: Index 9, Subindex 7 LDU 79. Technical Manual Rev.. January 7 Page of 46

12 6.4 Communication Pfile The parameters, which are critical for communication, are determined in the communication pfile. This includes the data for manufacturer's pduct nomenclature, for identification, or the parameters for object mapping. Abbreviations used in Tables: rw wo read only read / write write only (read will not be regarded as an err, but returns undefined results) Unsigned 8 UI6 Unsigned 6 UI3 Unsigned 3 I3 Signed 3 REAL3 VS 3 bit IEEE754 floating point Visible String 6.5 Object Directory The object directory of the CAN communication system is described below. These entries are in the documentation for the sake of mapping information. These functions must be used thugh Pcess Data Objects (PDO). LDU 79. Technical Manual Rev.. January 7 Page of 46

13 Communication Pfile (Tables) Index Subindebute Name Type Attri Defaultvalue Meaning Device Type UI3 Non standard device pfile Err Register Bit : Generic err Bit 4: Communication err Bit 7: Manufacturer specific err Manufacturer Status UI3 Not used Register 5 COBID Sync message U 8H COBID of the SYNC object 6 Communication cycle U Not used Period 7 Synchnous Window U Not used Length C Guard Time UI6 rw 3 Cycle time in ms, set by the NMT Master or the configuration tool. Index Ch and Dh are used if index 7h is ze. D Life Time Factor rw 3 Life time is set by the NMT Master or the configuration tool. 4 COBID Emergency UI3 8H + COBID of the Emergency Object Message Node ID 7 Heartbeat Time UI6 rw Pducer Heartbeat time in ms. If index 7h is nonze the Heartbeat ptocol is used, otherwise the Nodeguard ptocol is used Identity Object Vendor ID Pduct Code Revision Number Serial Number UI3 UI3 UI3 UI3 4 69H Number of entries Vendor ID Pduct Code Revision Number Serial Number 4 Number of elements COBID Transmission type UI3 H + Node ID FFH Communication parameters of st Receive PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. 4 Number of elements COBID UI3 3H + NodeID Communication parameters of nd Receive PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. Transmission type FFH 4 Number of elements Communication parameters of 3 rd Receive PDO LDU 79. Technical Manual Rev.. January 7 Page of 46

14 Index 43 6 Subindex Name Type Attribute COBID UI3 Transmission type Number of elements COBID Transmission type Entries in Rx PDO st Object Cmd. Byte UI3 UI3 Defaultvalue 84H + NodeID FFH 85H + NodeID FFH 638H Meaning Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. Communication parameters of 4 th Receive PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. Mapping parameters of the st ReceivePDO Object is a bitwise command: Bit7 Bit6 Bit5 Bit4 Bit3 Bit Bit Bit Cmd: SnG SnN ST RT SZ RZ 6 Entries in Rx PDO st Object Cmd. Byte UI3 648H Mapping parameters of the nd ReceivePDO Object is a bitwise command: Bit7 Bit6 Bit5 Bit4 Bit3 Bit Bit Bit Cmd: TR TS 6 Number of mapped Entries in Rx PDO 3 63 Number of mapped Entries in Rx PDO 4 Mapping parameters of the 3 rd Receive PDO (disabled) Mapping parameters of the 4 th ReceivePDO (disabled) 8 Number of elements COBID Transmission type UI3 8H + Node ID FFH Communication parameters of st Transmit PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

15 Index Sub Index 8 Name Type Attribut Number of elements COBID UI3 Transmission type Default Value 8H + Node ID FFH Meaning Communication parameters of nd Transmit PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. 8 Number of elements COBID Transmission type UI3 38H + NodeID FFH Communication parameters of 3 rd Transmit PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. 83 Number of elements COBID Transmission type UI3 48H + NodeID FFH Communication parameters of 4 th Transmit PDO Determined using the CANopen minimum system ID assignment pcedure. Asynchnous communication. (Not used, will not be transmitted) A Number of mapped Entries in Tx PDO st Object nd Object UI3 UI3 9H 9DH Mapping parameters of the st TransmitPDO 3 bit IEEE754 floating point weight value. Status A Number of mapped Entries in Tx PDO st Object nd Object UI3 UI3 96H 9DH Mapping parameters of the nd TransmitPDO 3 bit IEEE754 floating point average value. Status LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

16 Index Sub Index A Name Type Attribut Number of mapped Entries in Tx PDO 3 st Object UI3 nd Object UI3 Default Value 93H 9DH Meaning Mapping parameters of the 3 rd Transmit PDO 3 bit IEEE754 floating point Tare Module Status A3 Number of mapped Entries in Tx PDO 4 Mapping parameters of the 4 th TransmitPDO (disabled) Index Sub Index Name Type Attribut Number of entries. Dummy wo Calibration wo General setup wo Dummy wo Setpoints wo Default Value 5 Meaning Number of parameters. Not used Save calibration settings (TAC ptected) Save general setup parameters Not used Save setpoint parameters Number of entries Dummy Factory Default Command byte Command byte wo wo wo wo Number of system entries. Not used Set factory default values (TAC ptected) See RPDO See RPDO LDU 79. Technical Manual Rev.. January 7 Page 5 of 46

17 Index Sub Index Name Type Attribut Number of entries. Dummy Dummy Dummy Filter setting Dummy Logic outputs Logic inputs I3 Measure Time Filter Mode No motion Range No motion Time Output Mask Dummy Start Delay Dummy Dummy Update Rate Ze Tracking Dummy Dummy Dummy Reserved Preset Tare Default Value 3 3 Meaning Number of parameters. Not used Not used Not used Filter setting Not used Digital Outputs Digital Inputs Measuring Time Filter mode Nomotion range Nomotion time Digital outputs mask Not used Start Delay Not used Not used Update rate Ze track (TAC ptected) Not used Not used Not used For internal use do not change Preset Tare LDU 79. Technical Manual Rev.. January 7 Page 6 of 46

18 Index Sub Index Name Type Attribut Number of entries. Absolute gain Absolute ze Calibrate enable Calibrate gain Dummy Dummy Calibrate max Calibrate min Dummy Calibrate ze Decimal point Display step size Multi Range Calibrate max Calibrate max 3 Initial ze range Ze Range Tare mode Non volatile tare Non volatile ze Default Value Meaning Number of calibration parameters. Absolute gain calibrate (TAC ptected) Absolute ze calibrate (TAC ptected) Calibrate enable (enables TAC when the TAC is written) Calibrate gain (TAC ptected) Not used Not used Calibrate max (TAC ptected) Calibrate min (TAC ptected) Not used Calibrate ze (TAC ptected) Decimal point (TAC ptected) Display step size (TAC ptect) Multi range / multi interval selection (TAC ptected) Calibrate max (TAC ptected) Calibrate max 3 (TAC ptected) Initial ze range (TAC ptected) Ze range (TAC ptected) Tare mode (TAC ptected) Non volatile / volatile tare select (TAC ptected) Non volatile / volatile ze select (TAC ptected) Index Sub Index Name Type Attribut Number of entries. Trigger Level Trigger Egde ReTrigWindow ReTrigTime HoldTime TareWindow TareTime ReTrigStop Dummy Dummy Δ Time Default Value Meaning Number of CheckWeigher parameters Trigger Level Trigger Egde ReTrigWindow ReTrigTime HoldTime TareWindow TareTime ReTrigStop Not used Not used Delta time LDU 79. Technical Manual Rev.. January 7 Page 7 of 46

19 6 Number of entries. Setpoint Setpoint I3 I3 rw rw 5 Number of Setpoint parameters. Setpoint value Setpoint value 7 Number of entries. Setpoint Setpoint I3 I3 rw rw Number of Setpoint parameters. Setpoint hysteresis Setpoint hysteresis LDU 79. Technical Manual Rev.. January 7 Page 8 of 46

20 Index Sub Index 8 Name Type Attribut Number of entries. Setpoint rw Setpoint rw Default Value Meaning Number of Setpoint parameters. Setpoint source Setpoint source Number of entries Gss weight Net Weight Tare Dummy Dummy Average weight A/D sample FLINTEC Device ID FLINTEC FW Version Device Status Dummy Serial Number Extended status REAL3 REAL3 REAL3 UI3 UI3 REAL3 I3 UI3 UI3 UI3 UI3 UI3 UI3 Number of entries in info array. Not used Not used Not used See TPDO s LDU 79. Technical Manual Rev.. January 7 Page 9 of 46

21 7. Commands Overview Command Short description Parameter value Page AD Communication: Device Address A n Allocation source for a set point, or 37 AZ Absolute ze point calibration ± 33 8 AG Absolute gain calibration ± 33 8 BR Communication: Baud Rate baud 39 CE Calibration: Open Calibration Sequence; Read TAC Counter CG Calibration: Set Calibration Gain (Span) at Load > Ze d 6 CI Calibration: Minimum Output Value d 4 CL Close communication (For compatibility only) None CM n Calibration: Set Maximum Output Value (n =, or 3) d 4 CS Save the Calibration Data (CM, CI, DS, DP, etc.) to the EEPROM None 8 CZ Calibration: Set Calibration Ze Point Scale Without Load None 5 DP Calibration: Set Decimal Point Position DS Calibration: Set Display Step Size,, 5,,, 5 d 5 DT Trigger function: Calculation Time for Shorttime Average ms 43 DX Communication: Set Fullduplex () (For compatibility only) 39 FD Factory default settings: Write Data to the EEPROM (TAC ptected) None 6 FM Digital filter: Filter Mode 9 FL Digital filter: Filter Cutoff Frequency GA Output: Get Triggered Average Value None 34 GG Output: Get Gss Value None 3 GI Retrieves an image file fm the LDU s EEPROM None 4 GL Output: Get Data String Average/Gss/Status None 34 GN Output: Get Net Value None 3 GS Output: Get ADC Sample Value None 3 GT Output: Get Tare Value None 3 GW Output: Get Data String Net/Gss/Status None 34 H n Setpoints: Hysteresis for Setpoint S (H) and S (H) d 37 HT Trigger function: Hold time for Violation of Setpoint Limit ms 38 ID Device information: Identify Device None 3 IN Logical Input: Input Status None 36 IO Logical Output: Output Status 36 IS Device information: Identify Device Status None 3 IV Device information: Identify Firmware Version None 3 IZ Calibration: Correction of System Ze None 6 MR Calibration: Define Multiinterval () or Multirange () or 5 MT Trigger function: Measuring Time for Averaging...3 ms 4 NA Network Address (CAN Open address) 7 39 NR Motion detection: Nomotion Range d 9 NS Network Settings (CAN Interface) 39 NT Motion detection: Nomotion Time Period ms 9 OF Output Format of Data String GL and GW 3 34 OM Output Mask 36 ON Open communication and send net weight (For compatibility only) 55 OP Open communication (For compatibility only) 55 PI Download a saved image file to the LDU s EEPROM None 4 LDU 79. Technical Manual Rev.. January 7 Page of 46

22 Command Short description Parameter value Page RS Device information: Read serial number None 4 RT Scale function: Reset Tare None 3 RW Trigger function: Trigger Window for Retrigger Function d 4 RZ Scale function: Reset Ze Point None 3 SA Autotransmit: Send Triggered Average Value automatically None 35 SD Trigger function: Start Delay ms 4 SG Autotransmit: Send Gss Value continuously None 35 SL Autotransmit: Send Data String Average/Gss/Status continuously None 35 SN Autotransmit: Send Net Value continuously None 35 S n Setpoints: Setup of Setpoints S and S d 37 SP Preset Tare value d 3 SR Software Reset None 3 SS Save the Setpoint Data (Sx, Hx, Ax) to the EEPROM None 4 ST Scale function: Set Tare None 3 SW Autotransmit: Send Data String Net/Gss/Status continuously SX Autotransmit: Send ADC Sample Value continuously None 35 SZ Scale function: System Ze Point None 3 TD Transmit delay (For compatibility only) 55 ms TE Trigger function: Trigger on Rising Edge () or Falling Edge () or 4 TI Trigger function: Averaging Time for Automatic Tarring ms 44 TL Trigger function: Trigger Level d 4 TM Calibration: Tare mode 3 7 TN Calibration: Set/Clear nonvolatile tare or 7 TR Trigger function: Software Trigger None 4 TS Trigger function: Stop Value for Retrigger Function d 43 TT Trigger function: Averaging Time for Retrigger Function ms 43 TW Trigger function: Window for Automatic Tarring d 43 UR Digital filter: Update Rate,, WP Save the Setup Data (FL, NR, NT, AD, BR, DX) to the EEPROM None 4 ZA Scale function: Set System Ze Point using TI setting None 3 ZI Calibration: Initial Ze Range d 7 ZN Calibration: Set/Clear nonvolatile ze or 8 ZR Calibration: Ze Range d 7 ZT Ze Tracking: Range 55 6 LDU 79. Technical Manual Rev.. January 7 Page of 46

23 8. Commands Description For better clarity, all commands are divided into gups as described on the following pages. Note: In the brakets [.] you see the CAN bus index and subindex; if [n.a.] is mentioned, the command is not available over CAN bus. 8.. System Diagnosis Commands ID, IV, IS, SR, RS Use these commands you get the LDU 79. type, firmware version or device status. These commands are sent without parameters ID Get Device Identity [ SDO 9 sub 8 ] Master (PC / SPS) sends Slave (LDU 79.) responds ID D:79 The response to this request gives the actual identity of the device. This is particularly useful when trying to identify different device types on a bus IV Get Firmware Version [ SDO 9 sub 9 ] Master (PC / SPS) sends Slave (LDU 79.) responds IV V:7 The response to this request gives the firmware version of the device IS Get Device Status [ SDO 9 sub A ] Master (PC / SPS) sends IS Slave (LDU 79.) responds S:67 (example) The response to this request comprises of two 3digit decimal values (67 and ), which can be decoded according to the table below: Leftmost 3digit value Rightmost 3digit value Signal stable (no motion) (not used) Zeing action performed (not used) 4 Tare active 4 (not used) 8 Center ze 8 (not used) 6 Input 6 (not used) 3 Input 3 (not used) 64 (Setpoint) output active 64 (not used) 8 (Setpoint) output active 8 (not used) The example decodes the result S:67 as follows: Signal stable (no motion) [ = ] Zeing action performed [ = ] Tare not active [ = ] Weight <> [ = ] Input not active [ = ] Input not active [ = ] Output active [ = 64] Output not active [ = ] SR Software Reset [ n.a. ] Master (PC / SPS) sends SR Slave (LDU 79.) responds OK This command will respond with OK and after maximum 4 ms perform a complete reset of the LDU. It has the same functionality as power OFF and ON again. LDU 79. Technical Manual Rev.. January 7 Page of 46

24 8..5. RS Read Serial Number [ SDO 9 sub C ] Issuing the RS command will return the current serial number in the format S Master (PC / SPS) sends Slave (LDU79.) responds Meaning RS S Request: SN = Calibration Commands CE, CM n, CI, MR, DS, DP, CZ, CG, ZT, FD, IZ, ZR, ZI, TM, TN, ZN, AZ, AG, CS 8... CE Read TAC* Counter / Open Calibration Sequence [ SDO 3 sub 3 ] With this command you can read the TAC counter (*TAC = Traceable Access Code) or you can open a calibration sequence. CE E+7 (example) TAC counter = 7 CE7 OK Calibration sequence active This command must be issued PRIOR to any attempt to set the parameters in the calibration gup of commands. In legal for trade applications the TAC counter can be used to check if critical parameters have been change without reverification. After each calibration save (CS) the TAC counter increases by CM n Set Maximum Output Value [ CM / CM: SDO 3 sub 7 ] [ CM: SDO 3 sub E ] [ CM3: SDO 3 sub F ] This command (CM n with n =, or 3) is used to set up the maximum output value (respective the switching point in multi range applications). Permitted values are fm to CM M+3 Request: CM = 3 d CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CM_5 OK Setup: CM = 5 d This value will determine the point at which the output will change to ooooooo, signifying overrange respective the point at which the output will change the measuring range / interval size. Application CM = MAX CM = MAX CM 3 = MAX 3 CM = Single range CM = (means CM not used) CM 3 = Dual range or dual interval (means CM 3 not used) CM =...MAX CM = MAX ( Command MR) Triple range or triple interval CM =...MAX CM = MAX...MAX CM 3 = MAX ( Command MR) It is necessary: MAX < MAX < MAX Note: The range, in which a scale can be set to ze (SZ) or automatic ze tracking (ZT) is active, is +/ % of CM value. Factory default: CM = , CM =, CM 3 = CI Set Minimum Output Value [ SDO 3 sub 8 ] This command is used to set up the minimum output value. Permitted values are fm to. CI I 9 Request: CI = 9 d CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CI OK Setup: CI = d This value will determine the point at which the output will change to uuuuuuu, signifying underrange. LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

25 Note: In bipolar applications (e.g. force or torque measurements) this parameter defines the max. output value for input signals with negative sign. Factory default: CI = MR Set Multirange / Multiinterval [ SDO 3 sub D ] This command is only relevant, if CM > or CM 3 >. Is this the case, then this command defines, if the application is multirange or multiinterval. Permitted values are (Multiinterval) or (Multirange). MR M+ Request: MR = (Multiinterval) CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active MR OK Setup: MR = (Multirange) Note: Single range applications ignore this parameter DS Set Display Step Size [ SDO 3 sub C ] This command allows the output to step up or down by a unit other than. Permitted values are,, 5,,, 5,, and 5. DS S+ Request: Step size CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active DS5 OK Setup: Step size 5 Legal for trade applications allow for up to intervals. The allowed step size has to be considered DP Set Decimal Point Position [ SDO 3 sub B ] This command allows the decimal point to be positioned anywhere between leftmost and rightmost digits of the 6digit output result. Permitted values are,,, 3, 4, 5 and 6. Position means no decimal point. Factory default: DP = 3 DP P+3 Request: Position of decimal point 3 CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active DP OK Setup: no decimal point CZ Set Calibration Ze Point [ SDO 3 sub A ] This is the reference point for all weight calculations, and is subject to TAC contl. Factory default: appx. mv/v input signal Master (PC / SPS) sends Slave (LDU79.) responds Meaning CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CZ OK Ze point saved LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

26 8..8. CG Set Calibration Gain (Span) [ SDO 3 sub 4 ] This is the reference point for calibration under load, and is subject to TAC contl. Permitted values are fm to CG G+ Request: Calibration weight = d CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CG5 OK Setup: Calibration weight = 5 d For calibrating an input signal near the display maximum (CM) will give the best system performance. The minimum calibration load of at least % is recommended. Is the calibration weight smaller than % of display maximum (CM), the LDU will respond with an err message ( ERR ). Factory default: =. mv/v input signal ZT Enable / Disable Ze Tracking [ SDO sub ] This command enables or disables the ze tracking. ZT = disables the ze tracking and ZT = or higher enables the ze tracking. Issuing the command without any parameter returns the current ZT value. Permitted values are to 55. Master (PC / SPS) sends Slave (79.) responds Meaning ZT Z: Request: ZT status CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active ZT OK Setup: ZT = Disable Ze tracking will be performed only on results less than ZT range at a rate of.4 d/sec, where d = display step size (see DS command). The ze can only be tracked to +/ % of maximum (see CM n command). ZT = means ±.5 d ZT = means ±5 d Factory default: ZT = [Disable] 8... FD Reset to Factory Default Settings [ SDO 6 sub ] This command puts the LDU back to a known state. The data will be written to the EEPROM and the TAC will be incremented by. Note: All calibration and setup information will be lost by issuing this command! CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active FD OK Factory default setting 8... IZ Correction of System Ze [ n.a. ] This command can correct the system ze after a successful calibration, e.g. to correct the unknown weight of a mounting accessory which was used to hold the calibration weight during the calibration pcedure. By a simple parallel shift of the gain curve the sensitivity of the scale will stay unaffected. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active IZ OK System ze corrected LDU 79. Technical Manual Rev.. January 7 Page 5 of 46

27 8... ZR Ze Range [ SDO 3 sub ] Sets the ze range manually this is the range in increments within which the weighing scale can be zeed. Issuing the ZR command without any parameter will return the current value. Permitted values are between the lower limit of (= factory default setting) and the upper limit of A value of ze enables the standard ze range of +/% of max. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active ZR OK Setup: Ze range = d ZI Initial Ze Range [ SDO 3 sub ] Define the initial ze range ( d). If ZI is nonze the device will perform an automatic SetZe when the weight stabilizes with the Nomotion settings and the weight is within the ZI range. Factory default:. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active ZI OK Setup: Initial Ze range = d TM Tare mode [ SDO 3 sub ] This command sets the tare mode. The tare modes are defined in the table below. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active TM OK Setup: Tare mode = Tare modes: TM Allow tare of negative values Clear preset tare at return to range (Default) Yes Yes No Yes Yes No 3 No No For OIML R76 compatible applications a tare mode of must be used TN Set / Clear NonVolatile Tare [ SDO 3 sub 3 ] This command sets the tare mode to volatile or nonvolatile. Value range is or ; Factory default is (volatile). If set to (nonvolatile), every set/clear tare will write the value directly to the EEPROM. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active TN T: Actual setting: TN = volatile TN OK Setup: TN = nonvolatile LDU 79. Technical Manual Rev.. January 7 Page 6 of 46

28 8..6. ZN Set / Clear NonVolatile Ze [ SDO 3 sub 4 ] This command sets the ze mode to volatile or nonvolatile. Value range is or ; Factory default is (volatile). If set to (nonvolatile), every set/clear ze will write the value directly to the EEPROM. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active ZN Z: Actual setting: ZN = volatile ZN OK Setup: ZN = nonvolatile AZ Absolute ze point calibration (ecal) [ SDO 3 sub ] The command AZ is used as reference point for all weight calculations and will setup in mv/v. Permitted values are ± 33 (= ± 3.3 mv/v). AZ Z+796 Request: Ze mv/v CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active AZ_5 OK New: Ze mv/v Factory default: input signal AG Absolute gain calibration (ecal) [ SDO 3 sub ] The command AG is used as absolute gain (or measuring range) for all weight calculations and will setup in mv/v. Permitted values are ± 33 (= ± 3.3 mv/v). AG G+868,+ Request: gain mv/v CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active AG_+_+5 OK New: gain 5 mv/v Factory default: input signal CS Save the Calibration Data [ SDO 4 sub ] This command results in the calibration data being saved to the EEPROM and causes the TAC to be incremented by. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CS OK Calibration values saved The CS command saves all of the calibration gup values, as set by CZ, CG, CM n, DS, DP and ZT. The command returns ERR and has no updating action unless it is preceded by the CE_XXXXX. LDU 79. Technical Manual Rev.. January 7 Page 7 of 46

29 8.3. Motion Detection Commands NR, NT The motion detection facility pvides a means of disabling certain functions whenever a condition of instability, or motion, is detected. The no motion or stable condition is achieved whenever the signal is steady for the period of time set by NT, during which it cannot fluctuate by more than NR increments. The stable condition activates the relevant bit of responses to Info Status (IS). Following functions are disabled if motion is detected: Calibrate Ze (CZ) Calibrate Gain (CG) Set Ze (SZ) and Set Tare (ST). After such a command the system returns an err ( ERR ), if the signal is not stable NR Set Nomotion Range [ SDO sub A ] This is the range within which the weighing signal is allowed to fluctuate and still be considered as stable. Permitted values are fm to NR R+ Request: NR = d NR OK Setup: NR = d WP OK Setup saved Example: For NR = the fluctuations within a maximum of ± d, in the period NT, will be considered stable. Factory default: NR = [= ±d] NT Set Nomotion Time [ SDO sub B ] This is the period of time (in milliseconds) over which the weight signal is checked to be stable or not. The weight signal has to vary by less than NR divisions over the period of time NT to be considered stable. Permitted values are fm to NT T+ Request: NT = ms NT5 OK Setup: NT = 5 ms WP OK Setup saved If the value of NT = 5 milliseconds, the output must not fluctuate more than NR increments within 5 milliseconds in order to be considered stable. Factory default: NT = [ms] 8.4. Filter Setting Commands FM, FL, UR A digital filter can be set which will eliminate most of the unwanted disturbances. The commands FM and FL are used to define the digital filter settings, the command UR is used to define an averaging of up to 8 measurement values. Please note that these filters are positioned immediately after the A/D Converter and therefore affect all aspects of the weighing operation FM Filter Mode [ SDO sub 9 ] This command defines the filter mode. Choose the filter mode for your application. Permitted values are for IIR filter and for FIR filter. FM M+ Request: FM = (IIR filter) FM OK Setup: FM = (IIR filter) WP OK Setup saved The digital IIR filter operates as nd order low pass filter and Gaussian characteristics. The attenuation is 4dB/decade ( db/octave). The digital FIR filter works as a lowpass filter with quick response; damping see table mode. Default setting: (IIR filter) LDU 79. Technical Manual Rev.. January 7 Page 8 of 46

30 8.4.. FL Filter setting [ SDO sub 4 ] This command defines the 3dB filter cutoff frequency. FL F+3 Request: FL = 3 (4 Hz) FL OK Setup: FL = WP OK Setup saved The permitted settings are fm to 8 (see below table). Default setting: 3. Mode (IIR filter) Settings / Characteristics FL Settling time to.% (ms) 3 db Cutoff frequency (Hz) 3 Hz (db) Output rate* (samples/s) No filtering ** * Output rate = / UR samples/s ** Prefilter 8 Hz Mode (FIR filter) Settings / Characteristics FL Settling time to.% 3 db Cutoff frequency db damping at frequency 4 db damping at frequency Damping in the stopband Stopband Output rate* (ms) (Hz) (Hz) (Hz) (db) (Hz) (samples/s) No ** filtering >9 > >9 > >9 > >9 > >9 > >9 > >9 > >9 > 53 * Output rate = Table value/ UR samples/s ** Prefilter 8 Hz LDU 79. Technical Manual Rev.. January 7 Page 9 of 46

31 UR Update Rate and Averaging [ SDO sub ] Depending on the selected filter mode this command defines an averaging for the output value. The permitted settings are fm to 7 (see table below). The average value is always calculated fm UR measurement values. LDU 79. allows for the following settings: UR Average of UR values Check / Setup of the averaging: UR U+3 Request: Averaging of 8 values UR7 OK Setup: Averaging of 8 values WP OK Setup saved Default setting: 8.5. Taring and Zeing Commands SZ, ZA, RZ, ST, RT, SP The following commands allow you to set and reset the ze and tare values. The ze set up during calibration remains the true ze but the new current ze can be set up by using the SZ command. If the SZ command is issued and accepted then all weight values will then be based on the new current ze. Please remember that the ze value will be subject to the Ze tracking function if enabled. If the weight signal is not stable (as defined by the No motion range NR and the No motion time NT) then both the set ze SZ and set tare ST commands will be disabled. Also the Set Ze SZ command is not allowed if the new ze value required and the calibration ze differ by more than % of the CM value (maximum allowable value). See chapter 9 Used in Appved applications SZ Set System Ze [ RPDO, ] This command sets a new current ze which is then the basis of all weight values until further updated by the ze tracking function, another SZ command or the reset ze command RZ. Master (PC / SPS) sends Slave (LDU 79..) responds Meaning SZ OK Set ze performed The SZ command will fail (LDU 79. responds with ERR) if the new current ze is more than % (of the CM value) higher or lower than the true ze set during calibration. The SZ command will also fail if the weight signal is not stable as defined by the No motion range (NR) and the No motion time (NT). If the weight signal is stable, the response to the IS command (Device Status) will show the signal stable bit active and the SZ command will be accepted (OK). If the signal stable bit is not active, the SZ command will be rejected and the LDU will respond with ERR (err) ZA Set Averaged System Ze [ n.a. ] This command will set the system ze as SZ, but using an average over the TI time period RZ Reset Ze [ RPDO, ] This command cancels the SZ command and the ze reading reverts to that set by the CZ command during calibration. RZ OK Ze point CZ active The LDU responds to the RZ command with either OK or ERR. If OK is returned then the ze action performed bit in the Device Status (IS) response will be set to. LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

32 ST Set Tare [ RPDO,8 ] This command will activate the net weighing function by storing the current weight value as a tare value. The weight signal must be stable within the limits set by NR (No Motion Range) and NT (No Motion Time) commands for the signal stable bit to be active and set tare command to be accepted. ST OK Tare performed / Net operation If the weight signal is stable, the response to the IS command (Device Status) will show the signal stable bit active and the ST command will be accepted (OK). If the signal stable bit is not active, the ST command will be rejected and the LDU will respond with ERR (err) RT Reset Tare [ RPDO,4 ] This command resets the tare and the weighing signal returns to gss mode. RT OK Tare deactivated / Gss operation The LDU responds to the RT command with either OK or ERR. If OK is returned then the tare active bit in the Device Status (IS) response will be set to SP Set Preset Tare [ SDO sub 7 ] This command sets a tare value. SP T+ Tare value (factory default SP OK Setup tare value d 8.6. Output Commands GG, GN, GT, GS, GW, GA, GL, OF The following commands Get s the gss, net, tare and ADC sample values fm the LDU GG Get Gss Value [ SDO 9 sub ] GG G+. Gss value:. d GN Get Net Value [ SDO 9 sub ] GN N+. Net value:. d GT Get Tare Value [ SDO 9 sub 3 ] GT T+. Tare value: d LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

33 GS Get ADC Sample Value [ SDO 9 sub 7 ] This command gets the actual Analogue to Digital Converter (ADC) value. This can be useful during development or when calibrating to see how much of the ADC range is being used. GS S+5785 ADC sample value = 5785 d For service purposes it may be helpful to note the GS values for the noload or ze output and when the calibration load is applied GW Get Data String Net, Gss and Status [ n.a. ] Master (PC / SPS) sends Slave (LDU 79.) resp. Meaning GW The status bits and are defined as follows: W++59 (example) Net value: + d (no decimal point) Gss value: + d (no decimal point) Status bit : 5 (not used) Status bit : (Hex) Check sum: 9 (Hex) Status Value = Value = Value = 4 Value = 8 Status bit Not used Not used Output active Output active Status bit Signal stable Set ze performed Tare active Not used The check sum is the recipcal value of the sum of all ASCII values within the data string without the check sum itself GA Get Triggered Average Value [ SDO 9 sub 6 ] This command reads the measurement result of a measurement cycle. The measurement value has been averaged according the defined measuring time. The trigger commands can be found in chapter 8. and 8.3. GA A+. Request: GA = g Note: For preventing errs during the read out of the data, the register GA has stored the value at the beginning of the measurement cycle. The measurement result can only be read after the defined measuring time MT has been elapsed and before a new measurement cycle has been started GL Get Data String Average, Gss and Status [ n.a. ] Master (PC / SPS) sends Slave (LDU 79.) resp. Meaning GL L++59 (example) For check sum, status bit and status bit, see command GW. Average value: + d (no decimal point) Gss value: + d (no decimal point) Status bit : 5 (not used) Status bit : (Hex) Check sum: 9 (Hex) LDU 79. Technical Manual Rev.. January 7 Page 3 of 46

34 OF Output Format for Data String GW and GL [ n.a. ] This command puts the range information and/or the decimal point into the long data strings of the GW and GL output response. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active OF OK Setup: OF = Output Format Parameter setting Range Information Decimal Point in GW/GL response (= factory default) No No Yes No No Yes 3 Yes Yes E.g. when the range information is selected, the data strings will change fm G+ to Gn+, where n 3. LDU 79. Technical Manual Rev.. January 7 Page 33 of 46

35 8.7. Auto transmit Commands SG, SN, SX, SA, SL The following commands allow the gss weight or net weight values to be continuously sent. Continuous transmission starts as soon as the relevant command has been issued and finishes when any other valid command is accepted by the LDU 79.. The continuous transmission of either the gss or net values will stop when another valid command is received. Note: All commands in this chapter: [ n.a. ] SG Send Gss Value continuously SG G+. Gss value:, d SN Send Net Value continuously SN N+. Net value:, d SX Send ADC Sample Value continuously SX S+5785 ADC sample value = 5785 d SA Send Triggered Average Value automatically SA OK AutoTransmit: triggered average value This command will start to autotransmit the measurement value of the current trigger cycle. The trigger setup commands are described in the chapters 8. and SL Send Data String Average, Gss and Status automatically Master (PC / SPS) sends Slave (LDU 79.) resp. Meaning SL L++59 (example) For check sum, status bit and status bit see command SW. Average value: + d (no decimal point) Gss value: + d (no decimal point) Status bit : 5 (not used) Status bit : (Hex) Check sum: 9 (Hex) LDU 79. Technical Manual Rev.. January 7 Page 34 of 46

36 8.8. Commands for External I/O Contl IN, IO and OM IN Read status of the logic inputs [ SDO sub 7 ] This command reads the status of the logic inputs. IN IN: Input and inactive IN IN: Input active IN IN: Input active The status response is in the form of a four digit code where = false and = true (inputs are active high ). The least significant bit corresponds to Input IO Read / modify the status of the logic outputs [ SDO sub 6 ] This command reads and can modify the status of the logic outputs (if enabled by the OM command). The status response is in the form of a four digit code where = false and = true (outputs are normally open, open drain MOSFET s), the least significant bit corresponds to Output. IO IO: Output is active IO IO: Output is active The status of the outputs can be changed by issuing the IO command with the apppriate 4 digit code e.g. IO where in this example output will be activated (FET conducting). Please note that the status of the logic outputs is normally determined by the internal setpoints (see section.9.) and therefore setting the logic output status using the IO commands is not allowed. Setting IO_ OK Set output active IO_ OK Set outputs and active However, the OM command can be used to allow the status of the logic outputs to be set via the IO command OM Contl of the logic outputs by the host application [ SDO sub C ] The logic outputs can be contlled by the host application (as opposed to the normal internal setpoints) if they are enabled by the OM command and the apppriate 4 digit code. OM OM: Setting Output is enabled OM OM: Setting Outputs and are enabled A bit in the code enables the corresponding logic output to be contlled by the host application using the IO command. A in the code leaves the corresponding logic output contlled by the internal setpoint. Logic output is again the least significant bit. Setting Master (PC / SPS) sends Slave (DAD 79.) responds Meaning OM_ OK Enables output OM_ OK Enables outputs and Note: When reading the status of the logic outputs using the IO command, the setpoint status will be returned regardless of the OM setting. Sending OM_ disables the external logic output contl. LDU 79. Technical Manual Rev.. January 7 Page 35 of 46

37 8.9. Setpoint Output Commands S n, H n, A n, HT Each logic output can be assigned to an independent setpoint value (S n ) with a corresponding hysteresis/switch action (H n ) and allocation (A n source is the Gss, Net or Average weight) S n Setpoint Value [ S: SDO 6 sub ] [ S: SDO 6 sub ] A setpoint is the trigger level that causes action of the output channel relay, according to the settings of the contls A n and H n. S S:+ Request: Setpoint S = d S_3 OK Setup: Setpoint S = 3 d S S:+ Request: Setpoint S = d S_5 OK Setup: Setpoint S = 5 d H n Hysteresis and Switching Action for a Setpoint [ H: SDO 7 sub ] [ H: SDO 7 sub ] The setpoint switching logic is defined by the numeric value and polarity of the hysteresis. Examples of the switching actions for a Setpoint value of kg H H:+ Request: setup hysteresis of setpoint S H_ OK Setup: pos. hysteresis d for setpoint S H H:+ Request: setup hysteresis of setpoint S H_5 OK Setup: neg. hysteresis 5d for setpoints Allowed hysteresis values are within the range fm 9999 to at a step size of A n Allocation source for a Setpoint [ A: SDO 8 sub ] [ A: SDO 8 sub ] Set the source for setpoint n. This source will trigger the required action of the output channel relay, according to the settings of the contls S n and H n. Choose the source for the setpoint n : Gss weight Net weight Average weight A A:+ Request: Source Gss for setpoint S A_ OK Setup: Source Net for setpoint S A A:+ Request: Source Net for setpoint S A_ OK Setup: Source Net for setpoint S Note: All changes to the setpoint settings have to be stored in the EEPROM using the SS command. See chapter. LDU 79. Technical Manual Rev.. January 7 Page 36 of 46

38 HT Hold time for all Setpoints [ SDO 5 sub 5 ] This command defines the hold time for the setpoint limit. The signal has to exceed the setpoint limit continuously at least for this time period before a switch event will be initiated (see chapter 8.9 for setpoint setup). Note: This setup will affect both setpoints. Permitted value rang eis to ms. Default setting: HT = ms. HT T+ Request: HT = ms HT OK Setup: HT = ms LDU 79. Technical Manual Rev.. January 7 Page 37 of 46

39 8.. Communication Setup Commands AD, NA, NS, BR, DX 8... AD Device Address Serial channel [ n.a. ] This command can set up the device address in the range fm to 55. AD A: Request: Address (= factory default) AD49 OK Setup: Address 49 Setting the device address to will cause the device to be permanently active, listening and responding to every command on the bus without the need for an OP command. Note: After editing the address you first have to save the changes (command WP) and then restart the device NA Network Address CAN [ n.a. ] This command displays or sets a network address for the CAN interface. The permitted range is fm to 7. NA A: Show CAN interface address NA_5 OK Set CAN interface address to5 Factory default: NS Network Settings CAN [ n.a. ] The command NS [Param] [New Value] can be used to set up the CAN address and bit rate. NS_ D:79 The device type is LDU 79 NS_ A: The actual CAN address is NS_ B 5 The actual CAN bit rate is 5kBit/s NS OK Set the CAN bit rate to Mbit/s BR Baud Rate Serial channel [ n.a. ] With this command the following baud rates can be setup: 96, 9, 384, 576, 5, 34 and 468 Baud. BR B 5 Request: 5 Baud (= factory default) BR34 OK Setup: 34 Baud Factory default: 5 baud Note: After editing the baud rate you first have to save the changes (command WP) and then restart the device DX Full Duplex Serial channel [ n.a. ] The LDU 79. always operate in full duplex mode. Master (PC / SPS) sends Slave (LDU 79.) resp. Meaning DX X: Request: DX = (Full duplex, factory default)) DX OK Setup: DX = (Full duplex) LDU 79. Technical Manual Rev.. January 7 Page 38 of 46

40 8.. Save Calibration and Setup Data Commands CS, WP, SS, GI, PI The calibration and setup parameters can be divided in 3 gups: Calibration: CM, DS, DP, CZ, CG, ZT, IZ and FD, etc. saved by command CS Setup: FL, FM, NR, NT, BR, AD, DX and others, saved by command WP Setpoints: S, S, H, H, A, A saved by command SS Note: Calibration data can only be saved if the TAC code is known and precedes the CS command. See the CE and CS commands in chapter 8.. The setup data and the setpoint data will be stored nonvolatile in the EEPROM using the WP respective SS command CS Save the Calibration Data [ SDO 4 sub ] This command results in the calibration data being saved to the EEPROM and causes the TAC to be incremented by. CE E+7 (example) Request: TAC counter CE7 CE7 OK Calibration sequence active CS OK Calibration values saved The CS command saves all of the calibration gup values, as set by CZ, CG, CM n, DS, DP and ZT. The command returns ERR and has no updating action unless it is preceded by the CE_XXXXX WP Save the Setup Parameters [ SDO 4 sub 3 ] With this command the settings of the Filter (FL, FM), the Nomotion (NR, NT) and the communication (AD, BR, DX) will saved in the EEPROM. WP OK Setup data saved WP ERR Err SS Save Setpoint Parameters [ SDO 4 sub 5 ] With this command the setpoints (S n ), the setpoint hysteresis (H n ) and the setpoint allocation (A n ) will be saved in the EEPROM. SS OK Setpoint parameters saved SS ERR Err GI Get an Image File fm the EEPROM [ n.a. ] Retrieves a HEXINTEL formatted EEPROM image file fm the EEPROM of the source LDU. The image file contains all stored information except the calibration data. This image file can be downloaded to any LDU with the same firmware type and revision No. as the source LDU PI Download an Image File to the EEPROM [ n.a. ] Downloads a HEXINTEL formatted EEPROM image file to the target LDU EEPROM. The image file contains all stored information except the calibration data. Attention: The target LDU must have same firmware type and revision no. as the source LDU. LDU 79. Technical Manual Rev.. January 7 Page 39 of 46

41 8.. Trigger Commands SD, MT, GA, TE, TR, TL, SA Note: All changes to the trigger commands have to be stored in the EEPROM using the WP command. See chapter SD Start Delay Time [ SDO sub E ] This command defines a time delay between the trigger and the start of the measurement. Setting range: ms to ms. SD S+ Request: SD = ms SD OK Setup: SD = ms Default setting: SD = ms; time plot of a typical checkweigher cycle see below 8... MT Measuring Time [ SDO sub 8 ] This command defines the measuring time for the averaged measurement result. Setting range: ms to 3 ms. Master (PC / SPS) sends Slave (79.) responds Meaning MT M+ Request: MT = ms MT5 OK Setup: MT = 5 ms Note: The setting MT = disables the trigger function and the averaging. Default setting: MT = [= trigger function disabled]; time plot of a typical checkweigher cycle see below GA Get Triggered Average Value [ SDO 9 sub 6 ] This command reads the measurement result of a measurement cycle. The measurement value has been averaged according the defined measuring time. GA A+. Request: GA = g Note: For preventing errs during the read out of the data the register GA has stored the value at the beginning of the measurement cycle. The measurement result can only be read after the defined measuring time MT has been elapsed and before a new measurement cycle has been started TE Trigger Edge [ SDO 5 sub ] This command defines the trigger edge. Allowed settings are for falling edge and for rising edge. This command can only be used in conjunction with a hardware trigger on the digital input channel. TE E: Request: TE = (rising edge) TE OK Setup: TE = (falling edge) Default setting: TE = [= falling edge]; time plot of a typical checkweigher cycle see below TR Software Trigger [ RPDO,8 ] This command starts a measurement cycle. Its execution can be compared to a hardware trigger on the digital input channel. TR OK Trigger event LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

42 8..6. TL Trigger Level [ SDO 5 sub ] This command defines a level for a rising edge trigger on the measurement signal. Setting range: to TL T Request: TL = TL OK Setup: TL = In the example a new measurement cycle would automatically start, if the signal exceeds d (e.g., g; trigger commands SD and TL). Default setting: TL = [= trigger level disabled] Note: All trigger possibilities are always available in parallel. If a software trigger (command TR) or a hardware trigger (Digital input ) will be used the trigger level should be set to its maximum value (TL = ). This setting disables the trigger level. Figure: Time plot of a typical checkweigher cycle SA Send Triggered Average Value automatically [ n.a. ] SA OK AutoTransmit: triggered average value This command will start to autotransmit the measurement value of the current trigger cycle ReTrigger Commands RW, TT, TS, DT, TW and TI Note: All changes to the retrigger commands have to be stored in the EEPROM using the WP command. See chapter. LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

43 8.3.. RW Trigger Window for ReTrigger Function [ SDO 5 sub 3 ] This command defines a trigger window in unit d (digits) aund the current cycle average value. If the signal leaves this window even for one sample, then the averaging over the time period TT will be started again. For using the automatic retrigger function, it is required to define a shorttime averaging period (command DT, see below) before you can use this function. Default value: RW = d. RW R Request: RW = d RW5 OK Setup: RW = 5 d TT Averaging Time for Retrigger Function [ SDO 5 sub 4 ] This command defines an averaging time for calculating the cycle average value. If this time period has been elapsed, the measurement cycle will be finished at the latest. The setting TT = disables the retrigger function. Default setting: TT = ms. TT T Request: TT = ms TT3 OK Setup: TT = 3 ms TS Stop Value for Retrigger Function [ SDO 5 sub 8 ] This command defines a stop criteria in unit d (digits) for the retrigger function. If the signal falls more than this value TS below the cyclic average value, then the measurement cycle will be finished. Default setting: TS = d. Master (PC / SPS) sends Slave (LDU79.) responds Meaning TS T Request: TS = d TS48 OK Setup: TS = 48 d DT Shorttime Averaging Period [ SDO 5 sub B ] This command defines a time period to calculate shorttime averages. If the shorttime average falls outside the trigger window, then the measurement will be started again. DT T+5 Request: DT = 5 ms DT5 OK Setup: DT = 5 ms TW Window for Automatic Taring [ SDO 5 sub 6 ] This command defines an amplitude window for the automatic taring. The setting TW = means, that the system calculates a new tare value, if the averaged net value of the empty scale falls within digits of the net ze point. The new tare value will be averaged over the time period TI (see below). If the averaged tare value falls outside this window, then the tare value will not be updated. Default setting: TW = [= automatic taring disabled] TW T+ Request: TW = d TW OK Setup: TW = d LDU 79. Technical Manual Rev.. January 7 Page 4 of 46

44 TI Averaging Time for Automatic Taring [ SDO 5 sub 7 ] This command defines the averaging time for the automatic taring. Within this time period the system calculates an averaged tare value. Default setting: TI = ms. TI T+ Request: TI = ms TI OK Setup: TI = ms Figure: Time plot of a measurement cycle with the retrigger function LDU 79. Technical Manual Rev.. January 7 Page 43 of 46