ii
5.2.6 Command 5: Status............................................................................. 5-4
5.2.7 Command 6: Flush Transmit Buffer....................................................5-5
5.2.8 Command 7: Activate Command Line................................................5-5
5.2.9 Command 8: Poll Tx Buffers for Data................................................5-5
5.2.10 Command 9: Flush Converted Data Buffer.......................................5-5
5.2.11 Command 66: Send Single-Byte Data to Datalogger.........................5-5
5.2.12 Command 67: Get Return Code........................................................5-6
5.2.13 Command 320: Send Data to SDM-SIO4..........................................5-6
5.2.14 Command 321: Execute Command Line Command.........................5-6
5.2.15 Command 1024: Send String to Device............................................5-8
5.2.16 Command 1025: Transmit a Byte......................................................5-8
5.2.17 Command 1026: Serial Port Status....................................................5-8
5.2.18 Command 1027: ‘Manual’ Handshake Mode................................. 5-10
5.2.19 Command 2049: Set Communications Parameters..........................5-10
5.2.20 Command 2054: Set Up Receive Filter...........................................5-12
5.2.21 Command 2304: Transmit String and/or Data to Device................5-12
5.2.22 Command 2305: Transmit Byte(s)..................................................5-14
5.3 SDM-SIO4 Configuration Examples...........................................................5-14
5.3.1 Sensors Where the Datalogger Can Request Data by Sending a Prompt
or Using a Handshaking Line:............................................................5-16
5.3.2 Sensors Which Send Data Out Without Prompting............................5-18
5.4 Outputting Datalogger Data.........................................................................5-25
5.5 Flushing the Input and Output Buffers.........................................................5-26
5.6 Return Error Codes...................................................................................... 5-26

Section 6. Data Error Detection .......................................6-1

6.1 Error detection with the SDM-SIO4.............................................................. 6-1
6.2 Received Data................................................................................................ 6-1
6.2.1 Example of Using Received Data Filters..............................................6-3
6.2.2 CR10X Program Example....................................................................6-3
6.3 Transmitted Data............................................................................................6-6
6.3.1 Example of Using Transmitted Data Filters.........................................6-7
6.3.2 CR10X Program Example....................................................................6-8
6.3.3 Alternative CR10X Program................................................................6-8

Appendix A. ASCII Table ................................................. A-1

Appendix B. Serial Port Data Transfer Modes ............... B-1

B.1 Baud Rates....................................................................................................B-1
B.2 Stop Bits....................................................................................................... B-1
B.3 Data Length.................................................................................................. B-1
B.4 Parity Bits..................................................................................................... B-2
B.5 Serial Handshake Modes.............................................................................. B-2
Figures
1. Schematic Diagram of the SDM-SIO4.............................................................1-2
Tables
1. SDM-SIO4 Serial Port Pin Configuration........................................................1-3
2. Address Settings...............................................................................................2-1
3. Status LED Error Codes...................................................................................2-3
4. Fixed Strings Currently Allocated....................................................................3-6