Instruction manual CIU Prime type 880 (CIU858 emulation)

Transcription

1 Instruction manual CIU Prime type 88 (CIU858 emulation) Version.2 November 2 Part no.: Enraf B.V. P.O. Box AV Delft Netherlands Tel.: , Fax: Info@enraf.nl Offices in: Netherlands - France - Germany - Russia - UK - USA - China - Singapore Instruction manual CIU Prime type 88 (CIU858 emulation) Page

2 Copyright 2 Enraf B.V. All rights reserved. Reproduction in any form without the prior consent of Enraf B.V. is not allowed. This instruction manual is for information only. The contents, descriptions and specifications are subject to change without notice. Enraf B.V. accepts no responsibility for any errors that may appear in this instruction manual. The warranty terms and conditions for Enraf products applicable in the country of purchase are available from your supplier. Please retain them with your proof of purchase. Page 2

3 Preface Preface This manual has been written for the technicians involved with the communication with the Enraf series 88 communication interface units via CIU858 emulation protocol. For installation and commissioning of the CIU Prime, please refer to the related installation guide and configuration manuals. This manual describes the communication between a CIU Prime and higher layered systems. Safety and prevention of damage "Notes" have been used throughout this manual to bring special matters to the immediate attention of the reader. A Note points out a statement deserving more emphasis than the general text. Legal aspects The information in this configuration manual is copyright property of Enraf B.V., Netherlands. Enraf B.V. disclaims any responsibility for personal injury or damage to equipment caused by: Deviation from any of the prescribed procedures; Execution of activities that are not prescribed; Additional information Please do not hesitate to contact Enraf or its representative if you require additional information. Instruction manual CIU Prime type 88 (CIU858 emulation) Page 3

4 Table of contents Table of Contents Preface... 3 Introduction... 5 Communication parameters... 6 CIU (858) address... 6 Communication procedure... 7 Command records... 8 CIU individual command record... 8 Instrument individual command record... 8 Instrument group command record... 9 CIU answer records... 9 X-record (identification record)... Time-out record... Instrument answer records... BCC calculation... 2 ACK characters... 3 Appendix A: Related documents... 4 Page 4

5 Introduction Introduction CIU Prime Field ports Host ports Automatic polling The CIU Prime type 88 is the successor of the CIU type 858. This unit is an interface between the field instrumentation (e.g. 854 ATG, 873 SmartRadar, etc.) and inventory systems (CIU Plus, PLC, ENSITE, etc.). Up to four input boards can be installed to interface the EN-bus (BPM Bi- Phase Mark). By replacing one or more input boards by an RS- 232C/RS485 input board, the CIU Prime can interface to the 858 CIU (Communications Interface Unit). Two fixed RS-232C/RS485 output boards interface to a CIU Plus, PLC, ENSITE, etc. After configuration, the CIU Prime automatically performs the polling of the connected gauges and stores the information in a database. For a description of the configuration and programming, refer to the CIU Prime s configuration manual. For compatibility reasons most of the CIU858 protocol is implemented in the CIU Prime. This protocol is only available on host port 2. The CIU858 emulation mode must be enabled via the Ensite Pro configuration program. Received data request records from the host will be handled as follows: answer is generated by the CIU Prime based on information in the database, provided that the addressed instrument is known and data is available. the received record is transmitted to the addressed instrument (field line) in case the addressed instrument is known, but no data available in the database. The received instrument reply will be transmitted to the host. in case the addressed instrument is not known, the received record is transmitted to all field ports and wait for first reply. The received instrument reply will be transmitted to the host. Note: In case of receiving time-out records from the CIU (no gauge answer) retry 3 times to retrieve correct data from the CIU before setting an alarm. Instruction manual CIU Prime type 88 (CIU858 emulation) Page 5

6 Communication parameters Communication parameters The following communication parameters are supported: Transmission mode Baudrate Parity asynchronous, RS232-C / RS485, nonisolated, DTE-side. only available on host port 2 of the CIU Prime. 2, 24, 48, 96, 92 baud Odd or Even Start bit Data bits 7, LSB first (7 bits ASCII character) Stop bit(s) TX/RX mode Turn around delay Half Duplex Adjustable in msec. CIU (858) address Two different type fieldports can be plugged in the CIU Prime:. EN-bus to which Enraf instruments are connected direct. 2. RS-232c to which a CIU858 can be connected. Ad.: The CIU (858) address in the CIU858 emulation is the last decade of the decimal representation of the RTU address for host port 2. E.g. in case RTU address is 23 -> the CIU858 emulation address is 3. Ad 2.: The CIU (858) address in the CIU858 emulation is the address of the connected CIU858. The address of the connected CIU858 may not be identical to the last decade of the decimal representation of the RTU address of host port 2. E.g. in case RTU address is 3, then CIU858 address may not be. Page 6

7 Communication procedure Communication procedure The CIU858 uses a communication protocol based on a request/reply schedule. The protocol consists of command records and answer records. There are three types of command records: individual CIU command records individual instrument command records instrument group command records A record consists of a data field packed in an envelope. The envelope allows the receiver to detect the incoming record and to verify its proper reception. A record consists of: STX DATAFIELD ETX BCC In which: STX is the Start of TeXt character (ASCII value 2). data field data field packed in an envelope. ETX is the End of TeXt character (ASCII value 3). BCC is the Block Check Character. The general form of a communication record is as follows: STX ADDRESS(ES) TOI TOR (DATA) ETX BCC Instruction manual CIU Prime type 88 (CIU858 emulation) Page 7

8 Communication procedure Command records The following records can be sent to the CIU Prime. CIU individual command record This command is executed in the addressed CIU Prime, which sends back an answer record. STX N TOI TOR ETX BCC Pos : STX start of transmission Pos 2 : N CIU address (-9) Pos 3 : TOI R CIU-GPU version Pos 4 : TOR X send identify record Pos 5 : ETX end of transmission Pos 6 : BCC block check character Instrument individual command record The CIU will pass on these records (without the CIU address) to any connected field instrument. STX N nn TOI TOR ETX BCC Pos : STX start of transmission Pos 2 : N CIU address (-9) Pos 3,4 : nn instrument address (-99) Pos 5 : TOI B 8, 854, 873 instrument with GPU protocol and instruments with Gauge Type = B C 83 MGT + instruments with Gauge Type = C D 875 (Field Interface Unit) E 8 instrument with external alarms and instruments with Gauge Type = E F 874 (Analog Input any type Pos 6 : TOR see the Protocol Manual of the related instrument. Pos 7 : ETX end of transmission. Pos 8 : BCC block check character. Page 8

9 Communication procedure Instrument group command record The instrument group commands are transmitted (without the CIU address) to every connected instrument. STX N n n TOI TOR ETX BCC Pos : STX start of transmission Pos 2 : N CIU address (-9) Pos 3,4 : nn instrument address (-99) ** indicates that the command is intended for all connected instruments. *n indicates that the command is intended for all instruments ending with instrument address n n* indicates that the command is intended for all instruments starting with instrument address n Pos 5 : TOI B 8, 854, 873 instrument with GPU protocol and instruments with Gauge Type = B C 83 + instruments with Gauge Type = C E 8 instrument with external alarms and instruments with Gauge Type = any instrument Pos 6 : TOR see the Protocol Manual of the related instrument Pos 7 : ETX end of transmission Pos 8 : BCC block check character The CIU will answer with a time-out record (see chapter further in this manual) to the computer system as an acknowledgement that the instrument group command has been transmitted to all field instruments. CIU answer records The following records are transmitted to the computer system after reception of a CIU individual command record. Instruction manual CIU Prime type 88 (CIU858 emulation) Page 9

10 Communication procedure X-record (identification record) For compatibility reasons the X-record is implemented. A default answer will be given. STX N RXLOO ETX BCC Pos : STX start of transmission Pos 2 : N CIU address (-9) Pos : RXLOO default answer Pos : ETX end of transmission Pos : BCC block check character Time-out record This record will be transmitted to the computer system after an instrument group command is transmitted to the connected field instruments. The time-out record will also be transmitted if there was a malfunction in the field or in case a field instrument is not responding. STX ETX BCC Pos : STX start of transmission Pos 2 : N CIU address Pos 3 type of instrument is CIU858 compatible Pos 4 : (zero)error code (default is ) Pos 5 : ETX end of transmission Pos 6 : BCC block check character Here is an example of a correct answer record: STX 2 B B as ls IIIIIl ETX BCC Here is an example of an erroneous answer sequence: STX 2 STX ETX BCC 2nd : last character received from the instrument without error. 2nd STX : start of time-out record indicating that the information from the instrument is wrong. Page

11 Communication procedure Instrument answer records After a correctly received instrument individual command, the addressed instrument will answer to the CIU. This answer is passed on to the computer system by the CIU (the CIU adds its own address to the record). STX N n n TOI TOR data data... data ETX BCC Pos : STX start of transmission Pos 2 : N CIU address Pos 3,4 : nn instrument address Pos 5 : TOI type of instrument B 8, 854, 873 instrument with GPU protocol and instruments with Instrument Type = B C 83 + instruments with Gauge type = C D 875 (Field Interface Unit) E 8 instrument with external alarms and instruments with Gauge Type = E F 874 (Analog Input Module) Pos 6 : TOR type of record, see the Protocol Manual of the related field instrument. Pos 7,8 : data for the data in answer record, see the Protocol Manual Pos n- : ETX end of transmission Pos n : BCC block check character Instruction manual CIU Prime type 88 (CIU858 emulation) Page

12 Communication procedure BCC calculation The BCC is calculated by taking the binary sum without carrying over the seven individual data bits (exclusive or) of all transmitted bytes, according to ANSI standard X STX is excluded; ETX is included. The BCC is also called the horizontal parity check. Since the BCC summation can produce any one of the 28 code combinations, be sure to interpret it as the BCC, not as something else. For example if the value of the BCC is 2 (hexadecimal) do not read this as an STX character. Here is the example of a command record for a CIU with address. STX R X ETX BCC spelled out in bits: Char Parity b6 b5 b4 b3 b2 b b Comment STX R X ETX Start of TeXt (not in BCC calculation) BCC BCC character (calculated over 7 bits) Page 2

13 Communication procedure Here is the answer record from the CIU to the computer system: STX R X L O O ETX BCC spelled out in bits: Char Parity b6 b5 b4 b3 b2 b b Comment STX R X L O O ETX Start of TeXt (not in BCC calculation) BCC BCC character (calculated over 7 bits) ACK characters The computer system always initiates communication with the CIU using a command record. After sending this record, the computer system must wait for a reply from the CIU in the form of an answer record. After the turn around time, an answer record may be sent. But if the CIU is still busy preparing its reply - or if it is otherwise engaged in field communication - the CIU transmits ACK characters about every 5 msec. These characters are an ACKnowledgement of the command record, and show that the CIU intends to send an answer record to the computer system as soon as possible. The time out period of the computer system should start again on reception of an ACK character from the CIU. When a command record is accepted and being processed (i.e. ACKcharacters are sent every 5 msec.) a new command is not accepted. Instruction manual CIU Prime type 88 (CIU858 emulation) Page 3

14 Appendix A Appendix A: Related documents Title Instruction manual 88 CIU Prime Instruction manual 88 CIU+ Instruction manual Modbus TM protocol Instruction manual ENSITE Pro - 88 CIU Prime Instruction manual ENSITE Pro - 88 CIU+ Instruction manual ENSITE - ENTIS Pro under Windows NT Page 4

15 Notes Instruction manual CIU Prime type 88 (CIU858 emulation) Page 5

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