USB-Based 14-Channel Data-Acquisition Module

Transcription

1 USB-Based -Channel Data-Acquisition Module DLP-IO LEAD FREE FEATURES: IO s: 0- Analog, Digital In/Out, Temperature Two Bipolar Analog Inputs; ± Input Range Max All Analog Inputs: Up to 0Ksps Sample Rate and Selectable Sample Size: Rate: 00, 00, K, K, K, 0K, 0K, 0K Samples Per Second Size:, 6, 8, 6,, 0, 08, 096, 89 Samples (Binary Mode) SPDT Latching Relay Digital Temperature Sensor Feature Supported on Digital I/O Lines Both Binary and ASCII (HyperTerminal) Modes Available Two -Bit Interrupt-Driven Event Counters; KHz Max Count Rate USB Port Powered USB.- and.0-compatible Interface Small Footprint; Easily Fits on a Desktop Easy-To-Use Programming Interface APPLICATIONS: Robotics Control Motion Control/Presentation Data Acquisition Industrial/Process Control Process Monitoring Relay Control Audio Analysis.0 INTRODUCTION The DLP-IO Data-Acquisition Module is a low-cost, easy-to-use data-acquisition system for analyzing AC voltages, controlling and monitoring processes and measuring DC voltages in the range of both 0- volts and ± volts. This module provides topside wire terminal blocks for the wiring connections. The channels on the DLP-IO are broken down as follows: digital I/O; all of which can also be set to Analog Input Mode (0-). Two -bit, interrupt driven counter inputs. The DLP-IO also provides SPDT latching relay contacts. Each of the channels and relay contacts can be individually Rev.. (June 0) DLP Design, Inc.

2 controlled via simple single- and dual-byte commands. All operational power is taken from the host PC via the USB port. The mode of each I/O is automatically changed with each command sent. For example, if an I/O is set to Digital Output-High and then the Digital Input Mode is selected; the I/O is first changed to Input Mode, and then the high/low state is read and returned to the host..0 SPECIFICATIONS The DLP-IO is an all -volt system that derives its power from the host USB port. Channels have the following capabilities: Relay Contacts: There is one set of SPDT relay contacts on the board. These contacts are latching and are capable of handling loads of up to A. The relay has two sets of SPDT contacts that have been connected in parallel to increase their current carrying capability. (These are detailed in Section 6 under the table describing K.) Analog In: Fourteen inputs can read and return the voltage on the analog inputs using a 0-bit ADC. The maximum sample rate is 0Ksps. The input voltage range is 0- volts. (Refer to Section 8 of this document for more details.) Two additional channels are dedicated to analog in only and can measure voltages in the range of - volts to + volts. Digital Output: Set high or clear low; configurable as digital outputs (). (The actual high/low voltage depends upon sink/source current.) Digital Input: Reads the input s high/low state. Temperature Measurement: Up to DS8B0+ temperature sensors can be connected to Channels through. Four settings of temperature measurement accuracy and speed are supported, as well as the ability read the permanent serial number of the sensor. Counter Inputs: Two inputs are dedicated to counting pulses. Values are stored in -bit registers that can be read and cleared..0 ABSOLUTE MAXIMUM RATINGS Stresses beyond the ranges listed below may cause permanent damage to the DLP-IO: Operating Temperature: 0-70 C Voltage on Digital Inputs with Respect to Ground: -0.V to +.V Voltage on Analog Inputs with Respect to Ground: -0.V to +.V Voltage on Relay Contacts with Respect to Ground/Return: 0VDC, AC Sink/Source Current on Any I/O: ma Sink/Source Current on All I/O Combined: 90mA Rev.. (June 0) DLP Design, Inc.

3 .0 WARNINGS Unplug from the host PC before connecting to the I/O terminals on the DLP-IO. Isolate the bottom of the board from all conductive surfaces. Observe static precautions to prevent damage to the DLP-IO module..0 USB DRIVERS USB drivers for the following operating systems are available for download from the DLP Design website: Windows 7 x6 Windows XP Windows XP x6 Windows Server 00 Windows CE, 98, ME Windows Server 008 x6 Windows Vista Mac OSX Mac OS8, OS9 Linux These drivers are available for download from the following pages: and Note: If you are utilizing the dual-mode drivers from FTDI (CDM.x.x) and you want to use the Virtual COM Port (VCP) drivers, then it may be necessary to disable the DXX drivers first via Device Manager. To do so, right click on the entry under USB Controllers that appears when the DLP-IO is connected, select Properties, select the Advanced tab, put a check mark in the option for Load VCP and click OK. Then unplug and replug the DLP-IO, and a COM port should appear in Device Manager under Ports (COM & LPT). 6.0 TERMINAL BLOCK PIN DEFINITIONS PIN NAME A A G C G TABLE Terminal Block Pin Definitions DESCRIPTION Analog Input A. Channel. Input voltage range is - to +. Analog Input A. Channel. Input voltage range is - to +. Ground Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). -bit Counter Input with a max countable frequency of KHz. Count increments after toggling low then high. Ground Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). External Reference Input (see Command 0xA for details). Rev.. (June 0) DLP Design, Inc.

4 Notes: C 6 Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). -bit Counter Input with a max countable frequency of KHz. Count increments after toggling low then high. Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Channel 6, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). COM Latching Relay Common Contact (see Note ). R Latching Relay Reset Contact (see Note ). S Latching Relay Set Contact (see Note ). 7 8 G 9 0 G Channel 7, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Channel 8, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Ground Channel 9, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Channel 0, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). VCC Output +.0V. Limit current drawn from this pin to 00mA to avoid exceeding the available current from the host USB port. Channel, Analog Input: Voltage range is 0 to + (see Note ). Digital I/O: pullup) (see Note ). Ground. The Analog Input Range is 0-. The maximum sample rate is 0Ksps. Refer to Section 8 for more details.. Digital outputs can sink or source ma; 90mA for all outputs combined. Open-drain outputs are implemented by making the I/O pin an input. The maximum pullup voltage is.0 volts.. Relay contacts can support resistive loads of up to 0 VDC, 0 VDC and VAC. If this value is exceeded, the DLP-IO can be damaged. The relay is set and reset only under software control. For a functional schematic of the relay connections, refer to Section 7. Rev.. (June 0) DLP Design, Inc.

5 7.0 RELAY FUNCTIONAL SCHEMATIC The DLP-IO contains one latching relay. The relay is controlled by host software. The relay contacts R, S and COM are described in Table. A functional view of how the relay works is shown here: Figure : Relay Functional Schematic Note: On power-up of the DLP-IO, the relay states will be unknown. Each can power up in either the Set or Reset state. If a known initial state is required, the user will need to issue either a Set or Reset Command upon power-up. 8.0 USING THE DLP-IO Simply connect the DLP-IO to the PC to initiate the loading of USB drivers. Once the USB drivers are loaded, the DLP-IO is ready for use. All commands are issued as single-byte or double-byte command packets. First a channel is set by sending an ASCII -9, a, b, c, d or e for the desired channel. Then a byte is sent for the desired function. Table describes all of the available functions. You can either utilize the TestApp program provided with the DLP-IO, or you can write your own program in your language of choice. If the DLP-IO is set to ASCII mode, HyperTerminal can be used as the user interface. Begin by opening the COM port, and then send commands as shown in Table below. There is no need to set the baud rate because the DLP-IO uses a parallel interface between the USB IC and the microcontroller. (The Ping Command can be used to locate the correct COM port used for communicating with the DLP-IO, or you can look in Device Manager to see which port was assigned by Windows.) TABLE Command Packets Command ASCII Hex Packet Description Byte Value Return/Comments Ping Issue Ping 0x7 If the DLP-IO is found on the selected port, N is returned in ASCII Mode; 0xE if in Binary Mode. LED LED Flash, + 0xB Flash LED; Nothing Returned Control On, Off. 0xE LED ON; Nothing Returned Channel Select Relay Control Select the Channel Set/Reset Relay ` 0x60 LED OFF; Nothing Returned 0x- 0x9, 0x6-0x6-9, a,b,c, d,e Sets the active channel to be used with the commands in this table. If in ASCII Mode, the channel is returned plus CR/LF. Nothing is returned in Binary Mode. a, b, and c are Channels 0, and on the module; d and e are A and A on the module. k 0x6B Relay Set; Nothing Returned m 0x6D Relay Reset; Nothing Returned Rev.. (June 0) DLP Design, Inc.

6 Digital I/O Command Set C / F Mode & Save Temperature Sensor Detect Temperature Sensor Read Temperature Sensor Resolution Set Return Mode & Save Reset -Bit Event Counter Read -bit Event Counter INT / EXT Voltage Reference Select & Save Select Direction and Output Value Select Temperature Display Mode Detect Sensor & Return Serial Number from Current Channel Convert, Read and Return Data from Current Channel Select Temperature Sensor Resolution for the Current Channel ASCII / Binary Mode Select Clear C or C Event Counter Read the C and C Event Counters Select Internal or External Reference w 0x77 Output-High: Make current channel digital output and set it high; nothing returned. s 0x7 Output-Low: Make current channel digital output and clear it low; nothing returned. r 0x7 Input: Make current channel digital input and return state. If ASCII Mode is enabled; returns ASCII 0 or plus CR, LF. If Binary Mode is enabled; returns a binary 0 or. f 0x66 Select Fahrenheit Mode and save. Nothing returned. (Default) Selection saved for power-up default. g 0x67 Select Celsius Mode and save. Nothing returned. Selection saved for power-up default. ] 0xD If a DS8B0+ sensor is detected on the current channel, will return the 8-byte sensor serial number in bytereversed order. If in ASCII Mode, will return hex characters. In Binary Mode, will return binary data. A working sensor must be connected to the selected channel. t 0x7 If a DS8B0+ sensor is detected on the current channel, will start a temperature conversion, wait for the conversion to complete and return data. If in ASCII Mode, will return temperature in current C/ F Mode plus CR/LF. In Binary Mode, will return bytes of raw sensor data. (See Note.) - 0xD Set sensor resolution to 9-bit / Fast. Nothing returned., 0xC Set sensor resolution to 0-bit. Nothing returned. 0 0x0 Set sensor resolution to -bit. Nothing returned. \ 0xC Set sensor resolution to -bit / Slow (Default). Nothing returned. q 0x7 ASCII Mode selected. (Default) "ASCII mode" returned. h 0x68 Binary Mode selected. Nothing returned. u 0x7 Clear C Event Counter to zero. Nothing Returned. y 0x79 Clear C Event Counter to zero. Nothing Returned. n 0x6E Read and return C counter state. p 0x70 Read and return C counter state. If in Binary Mode, will return bytes--msbyte first. If in ASCII Mode, returns C: or C: followed by count (base 0) and CR/LF. i 0x69 Select internal reference provided by the host PC USB port. (See Note.) (Default) Nothing returned. x 0x78 Select (user-provided) external reference connected to Channel. Remember to select the reference voltage using Command 0xA (Set Reference Voltage). Nothing returned. Selection is saved for power-up default. Remember to set the reference jumper accordingly for use with Channels A and A. (See Section 9.) Rev.. (June 0) 6 DLP Design, Inc.

7 Set Sample Rate & Save Two-Byte Select the A/D Sample Rate Used by Command 0 0x0 00s/s selected and saved. 0x 00s/s selected and saved. 0x Ks/s selected and saved. 0x Ks/s selected and saved. Set Reference Voltage & Save Two-Byte Command Select Reference Voltage for ASCII Mode Voltage Calculation Command: * (0xA) Followed by V reference selected and saved.. reference selected and saved..0v reference selected and saved..v reference selected and saved.. reference selected and saved..0v reference selected and saved V reference selected and saved reference selected and saved V reference selected and saved V reference selected and saved. (Default) Reference voltage used in ASCII Mode by the DLP-IO for calculating voltage. (Not required in Binary Mode since actual voltage is calculated in the host program.) Selection is saved for power-up default. EX: *9 sent via HyperTerminal sets.0 volt reference. Rev.. (June 0) 7 DLP Design, Inc.

8 Command Set Number of Samples & Save Two-Byte Command Read Current Setup Single A/D Conversion 0x7A Command: = (0xD) Followed by 0-7 or 0x0-0x7 Set the Number of Samples Acquired by Command 0x7A Command: [ (0xB) Followed by 0-8 or 0x0-0x8 Read and Return the Current Saved Setup Read Analog Voltage from the Current Channel and Return to Host 0x Ks/s selected and saved. 0x 0Ks/s selected and saved. 6 0x6 0Ks/s selected and saved. 7 0x7 0Ks/s selected and saved. Sets the A/D sample rate for Command 0x7A. The selection is saved for power-up default. EX: 0xD, 0x0 sets the conversion rate at 0K samples per second. 0 0x0 return samples selected and saved. 0x 6 return samples selected and saved. 0x 8 return samples selected and saved. 0x 6 return samples selected and saved. 0x return samples selected and saved. 0x 0 return samples selected and saved. 6 0x6 08 return samples selected and saved. 7 0x7 096 return samples selected and saved. 8 0x8 89 return samples selected and saved. Sets the number of A/D samples returned from Command 0x7A. The selection is saved for power-up default. EX: 0xB, 0x06 sets the number of samples to 08. j 0x6A Returns the six saved parameters. (See Table for a description of each parameter.) In ASCII Mode, six ASCII characters (0-9) separated by spaces are returned followed by a CR/LF. In Binary Mode, 6 bytes are returned. v 0x76 Read a single voltage from the selected channel. bytes are returned for each conversion. If in ASCII Mode, voltage is calculated using current voltage reference parameters (see Table ) and returned as an ASCII string followed by CR/LF. If in Binary Mode, two bytes for the 0-bit A/D counts are returned--lsbyte first. To calculate voltage for Channels -: int temp = byte * + byte; float volts = temp / 0 * reference voltage; To calculate voltage for ch or ch, *add* this line of code: volts = ( volts - (vrefvoltage/.0) ) *.0; Rev.. (June 0) 8 DLP Design, Inc.

9 Multiple A/D Conversion Notes: Read Multiple Analog Voltages from the Current Channel and Return to Host z 0x7A Read multiple voltages from the selected channel per the selected setup parameters (see Table ). Bytes are returned for each conversion. This command is only available in Binary Mode. Two bytes for the 0-bit A/D counts from each measurement are returned; MSByte first. To calculate voltage for Channels -: int temp = byte * + byte; float volts = temp / 0 * reference voltage; To calculate voltage for ch and ch, *add* this line of code: volts = ( volts - (vrefvoltage/.0) ) *.0;. Requires a DS8B0+ digital temperature sensor (purchased separately). See Section 0.0 of this document for connection details. Before issuing a Convert Sensor Command, make sure that a digital temperature sensor is present on the selected digital I/O channel with a.k-ohm pullup resistor. (Refer to the DLP-IO demo code provided for temperature calculation method in Binary Mode.) Other examples are available from in Application Note AN6.pdf.. Using the host power supply as a reference may not produce accurate voltage measurements. For better accuracy, connect and select a precision voltage reference to Channel. (See Commands 0x78 and 0xA for more details.) TABLE Selectable Power-Up Default Settings Range Voltage Reference Sample Rate Number of Samples Returned C/ F Return Mode Reference Source 0.V 00s/s F ASCII Internal. 00s/s 6 C Binary External.0V Ks/s 8.V Ks/s 6. Ks/s.0V 0Ks/s V 0Ks/s Ks/s V 89 Default 9.0V Rev.. (June 0) 9 DLP Design, Inc.

10 9.0 REFERENCE JUMPER SELECTION A three-pin jumper selection is provided for setting the reference used by the analog input buffer for Channels and. These channels accept voltages in the range of ± if the internal reference is selected. If the external reference is selected and an external reference voltage is applied to Channel, then the input voltage range can be from ±.V up to ±.0V. Pin of this -pin jumper is closest to Wiring Terminal A. Place a jumper across Pins and to select the external reference applied to the terminal for Channel. Place the jumper across and to select the internal reference (factory default). 0.0 CONNECTING THE DIGITAL TEMPERATURE SENSOR Up to DS8B0+ digital temperature sensors can be connected to the DLP-IO. For best performance, use Category /6-type computer cable to connect the sensors to the DLP-IO. Two twisted pairs in the Cat /Cat 6 cable are required for the connection. The first twisted pair is for Power () and Ground, and the second twisted pair is for as Data and Ground. In addition, a.k-ohm pullup resistor is required for the data line. Figure shows an example of this connection using Channel : DLP-IO G 00-.K Ohm Pin DS8B0+. GND. DATA. VCC Figure : Digital Temperature Sensor Connection Example To detect a sensor, select a channel with a sensor connected, and then send the DLP-IO the Detect Sensor Command ] (0xD). The permanent serial number will be returned to the host PC. If the channel is stuck Low, a will be returned in the first byte on the 8 bytes returned. If no sensor is present, then a will be returned in the first byte. In these two cases, the remaining seven bytes will be all zeroes. If a sensor is present and functional, its 8-byte serial number will be returned. Next, send a Convert Sensor Command t (0x7) to initiate the temperature conversion. The temperature value is automatically returned after the conversion is complete. The conversion can take up to 70mS to complete depending upon the resolution setting. In the lowest resolution mode, the conversion takes approximately 00mS to complete. Rev.. (June 0) 0 DLP Design, Inc.

11 .0 DEMO APPLICATION PROGRAM A test application program called IOGUI is provided with the purchase of the DLP-IO that runs on Windows and can be used to interface with and control the DLP-IO. (Note that the Visual C++ source is also available with the purchase of the DLP-IO.) This application is designed to demonstrate all of the unit s available features: Figure : Test Application GUI Rev.. (June 0) DLP Design, Inc.

12 .0 MECHANICAL DIMENSIONS IN INCHES (MM) (Preliminary) 77.0 typ (.96m typ).9 typ (. typ). typ (.7 typ) A. typ ( typ).0 DISCLAIMER DLP Design, Inc., Neither the whole nor any part of the information contained herein nor the product described in this manual may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are supplied on an as-is basis, and no warranty as to their suitability for any particular purpose is either made or implied. DLP Design, Inc. will not accept any claim for damages whatsoever arising as a result of the use or failure of this product. Your statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary information that may be subject to change without notice. Rev.. (June 0) DLP Design, Inc.

13 .0 CONTACT INFORMATION DLP Design, Inc. 60 Roma Lane Allen, TX 70 Phone: Fax: Sales: Support: Website URL: Rev.. (June 0) DLP Design, Inc.

14 USB CONN CN C8.0uF FB C 0uF/0V C0.uF Q IRLML60CT P C.uF U D D C 0 VCC IN RC0 DB0.7uF DB0 AN0 DB D0 9 R RA0/AN0/ RC 6 USBDM D DB AN 0 DB 0K RA/AN RC 6 USBDP D DB AN RA/AN RC 7 DB DB AN/VREF DB C0 C9 D RA/AN/VREF+ RC DB RA DB 7pF 7pF D RA/T0CKI RC D 9 DB AN RA/AN RC6 DB6 8 VCCIN/NC D6 0 DB6 RC7 DB7 9 RESET# D7 6 DB7 AN 8 RB0/AN AVCC/NC AN0 9 RB/AN0 RD0 8 RD0 7 OSCI RXF# RXF AN8 0 9 WR D RB/AN8 RD 8 OSCO TXE# TXE AN9 0 TXE GREEN RB/AN9/PGM RD RD# RD AN RB/AN RD RXF R0 WR WR AN RB/AN RD RD 7 VOUT PWREN RD6 RD RD RD6 C 60 % RD6 PGC/RB6 6.uF RB6/PGC RD7 PGD/RB7 7 FTR RB7/PGD MCLR 8 RE/MCLR/VPP RE/AN7 7 AN7 RE/AN6 6 AN6 C RE0/AN AN 8pF C C U 6F887 C 0uF C.uF C7.uF DLP-IO v. AN/VREF UC MCP600 8 R 7K MCLR PGC/RB6 J PROGRAMMING HEADER VIN Vpp Clock Vcc Gnd Data R6 60K % C9.uF CH7, ANS7, RE CH8, ANS, RB0 CH9, ANS, RE0 CH0, ANS8, RB CH, ANS6, RE COM RST SET AN7 AN AN0 AN AN8 AN6 R9 60K % 6 6 AN AN PGC/RB6 AN AN/VREF PGD/RB7 AN9 AN CH6, ANS, RB CH, ANS, RB C CH, ANS, RA CH, ANS, RA C CH, ANS9, RB CH, ANS, RA PGD/RB7 CH, ANS0, RB AN0 VIN AN, A, ANS, RA COM VIN AN0, A, ANS0, RA0 K r RST B B RD s 0 r R8 60K % Q MMBT90 Y 0MHz RD0 Title Q MMBT90 <Title> Size Document Number Rev B <Doc> <RevCode> SET R 80K % UD MCP600 R7 80K % R 60K % R 80K % 6 6 R. 9 s set rst EE-TNU NC NC VSS VSS VDD VDD OSC OSC NC NC R6 80K % Ref Select + - UA MCP600 C6 8pF R 80K % R 80K % VIN + 7 AN UB A A - MCP600 R0 80K % AGND GND GND GND TEST VCCIO Date: Sunday, February 9, 0 Sheet of