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Contents

Section 1. Introduction..................................................... 1-1

1.1 What is the SDM-SIO4?.................................................................................1-1
1.2 Specifications.................................................................................................1-3
1.2.1 Serial Ports............................................................................................1-3
1.2.2 SDM Port..............................................................................................1-4
1.2.3 Case......................................................................................................1-4
1.2.4 Power Requirements.............................................................................1-4
1.2.5 Environmental Operating Range..........................................................1-4
1.2.6 Other Key Features...............................................................................1-5

Section 2. Installation and Hardware Set-Up.................. 2-1

2.1 Setting the SDM Address...............................................................................2-1
2.2 Selecting RS232 or 5V Logic for Each Port...................................................2-2
2.3 Connections to the SDM-SIO4.......................................................................2-2
2.3.1 Transient Protection and Grounding.....................................................2-2
2.4 Power-on Tests — the Status LED.................................................................2-3

Section 3. Understanding How the SDM-SIO4 Handles

Data................................................................. 3-1

3.1 Introduction....................................................................................................3-1
3.1.1 Method of Entering Special / Control Characters.................................3-1
3.2 Input Filters....................................................................................................3-2
3.2.1 Filter Types...........................................................................................3-2
3.3 Output Formatting..........................................................................................3-5
3.3.1 Simple Output Formatter......................................................................3-5
3.3.2 String Output Formats..........................................................................3-6

Section 4. Programming the SDM-SIO4.......................... 4-1

4.1 Command Line Operation and Structure........................................................4-1
4.2 Entering Commands.......................................................................................4-1
4.3 Basic Commands............................................................................................4-2
4.4 Advanced Commands.....................................................................................4-3

Section 5. Programming the SDM-SIO4.......................... 5-1

5.1 Instruction 113 Parameters.............................................................................5-1
5.1.1 Parameter 1 — Reps.............................................................................5-1
5.1.2 Parameter 2 — Address........................................................................5-1
5.1.3 Parameter 3 — Mode............................................................................5-1
5.1.4 Parameters 4, 5 and 6 — SDM-SIO4 Command..................................5-1
5.1.5 Parameter 7 — Values per Rep.............................................................5-2
5.1.6 Parameter 8 — Starting Input Location................................................5-2
5.1.7 Parameters 9 and 10 — Multiplier and Offset......................................5-2
5.2 Commands and Options (Parameters 4, 5 and 6)...........................................5-2
5.2.1 Understanding Parameter Options and Returned Values......................5-3
5.2.2 Command 1: Poll of Available Data....................................................5-3
5.2.3 Command 2: Signatures.......................................................................5-4
5.2.4 Command 3: Flush all Receive Buffers...............................................5-4
5.2.5 Command 4: Send Data to Datalogger................................................5-4