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B&B Electronics 232OPSDA manual Syntax

Models: 232OPSDA

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Table 3.2 - Equivalent Values

ASCII	Decimal	Hexadecimal

!	33	21h
#	35	23h
0	48	30h
A	65	41h
D	68	44h
O	79	4Fh
R	82	52h
S	83	53h
NUL	0	0h
SOH	1	1h
STX	2	2h
ETX	3	3h
EOT	4	4h
ENQ	5	5h
ACK	6	6h
BEL	7	7h

Syntax

As mentioned earlier, the command string consists of four bytes. The first byte is the start of message byte. The start of message byte is always the “!” character. The second byte is the address byte. This byte allows each unit to have a unique address (useful in RS-

485networks). Since the 232OPSDA uses RS-232 communications, this byte is the ASCII “0” (zero) character and cannot be changed. The next two bytes are the command characters. These bytes are used to specify which command will be executed by the module. Some commands require a fifth byte, a data byte.

Command Syntax: ! 0 _ _ _

Data Byte

2nd command Byte 1st Command Byte Address Byte Start of Message Byte

12Documentation Number 232OPSDA1397 Manual

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5105

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B&B Electronics 232OPSDA manual Syntax

Contents

Optically Isolated Serial Data Acquisition Module B&B Electronics Mfg. Co. IncNot Recommended for New Installations 232OPSDA ModuleCHAPTER 2 CONNECTIONS CHAPTER 3 COMMANDSCHAPTER 1 INTRODUCTION CHAPTER 4 A/DA-27 APPENDIX B 232OPSDA SCHEMATIC & BOARDAPPENDIX A DEC TO HEX TO ASCII CONVERSION B-29232OPSDA Features Chapter 1 IntroductionPacking List TD RDAnalog to Digital Converter Software Installation232OPSDA Specifications Digital Output Power SupplyDigital Input CommunicationsChapter 2 Connections A/D ConnectionsA/D 1 A/D 2 A/D 3 A/D 4 A/D 5 A/D 0 to 5VDC Input 0 to 5VDC Input 0 to 10VDC Input 0 to 5VDC Input0 to 5VDC Input GND 232OPSDADigital I/O Connections Serial Port ConnectionsDB25S Power Supply Connections Chapter 3 Commands Syntax Reading A/D Channels Command states Reading Digital I/O CommandSet Digital Output Command 0SOstatesA/D Converter Range Chapter 4 A/DSampling Rate × 10Ω Gain = VinV0 = 1+ R13R14LoopCurrent mA 1000 ×= 1+ Gain =10 × LoopCurrent Chapter 5 Software Application Program Interface20Documentation Number 232OPSDA1397 Manual B232OPSDAReadDigitalSyntax C hComDev, BYTE modAddr, WORD lines, WORD initComPortprocedure deinitComPort hComDev word BYVAL hComDev AS INTEGER, BYVAL modAddrLow-Level Communications deinitComPortRead A/D Command Read Digital I/O Command Step 1 - Constructing the command string Set Digital Output State 26Documentation Number 232OPSDA1397 ManualDocumentation Number 232OPSDA1397 Manual Appendix AA-1 Appendix A Decimal to Hex to ASCII ConversionDECIMAL to HEX to ASCII CONVERSION TABLE B&B Electronics -- PO Box 1040 -- Ottawa, IL