Campbell Scientific SDM-SIO1 Serial Input/Output Module - Manual (Page 5)

Table of Contents
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1. Introduction.................................................................1
2. Specifications .............................................................2
2.1 Supported Data Rates and Protocols ....................................................2
2.2 Electrical Parameters............................................................................3
2.2.1 SDM-SIO1 Current Consumption.................................................3
2.2.2 SDM-SIO1 Voltage Specifications ...............................................4
2.2.3 EMC Compliance..........................................................................4
2.3 Temperature and Humidity Ranges......................................................5
2.4 Physical Parameters .............................................................................5
2.5 Datalogger Compatibility.....................................................................5
3. Installation...................................................................5
3.1 Connections..........................................................................................6
3.2 Safety Considerations...........................................................................8
3.3 Examples for Connecting the SDM-SIO1 to Other Equipment ...........9
3.3.1 RS-485 One to One Connection Example.....................................9
3.3.2 RS-485 Multi Unit / In Line Example.........................................10
3.3.3 RS-485 Half Duplex Wiring Example ........................................11
3.3.4 RS-485 Internal Circuit Diagram ................................................11
3.3.5 RS-232 Wiring Example with Handshaking...............................12
3.3.6 RS-232 Basic 3-Wire Example ...................................................12
3.3.7 Connecting a 9-Way Socket to the SDM-SIO1...........................13
3.4 Power Conservation ...........................................................................13
4. Programming the Datalogger ..................................14
4.1 Special Information about the Serial I/O() CRBasic Instructions when
used with the SDM-SIO1 ...............................................................14
4.1.1 SerialOpen()................................................................................14
4.1.2 SerialClose() ...............................................................................17
4.1.3 SerialIn() .....................................................................................17
4.1.4 SerialOut()...................................................................................17
4.1.5 SerialInBlock()............................................................................18
4.1.6 SerialOutBlock() .........................................................................18
4.1.7 SerialInChk()...............................................................................18
4.1.8 SerialInRecord()..........................................................................18
4.1.9 SerialFlush()................................................................................18
4.1.10 Serial Input Errors.......................................................................18
4.2 Configuring Handshaking and Receive Only Modes.........................18
4.2.1 Using RTS/CTS and Automatic Handshaking............................18
4.2.2 RS-485 Half-Duplex Mode.........................................................19
4.2.3 Using the RS-232 Link in Receive Only Mode ..........................19
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