Table of Contents
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3.4.2. Web Edit ........................................................................................ 67
3.5. I/O Pair Connection ............................................................................. 76
3.5.1. Example 1: Pair Connection - AO to AI .......................................... 78
3.5.2. Example 2: Pair Connection - DO to DI ......................................... 83
3.6. More Information ................................................................................. 86
4.
Modbus and Modbus TCP ........................................................... 88
4.1. Modbus TCP/IP Interface .................................................................... 89
4.2. Protocol Description ............................................................................ 90
4.3. Data Encoding ..................................................................................... 93
4.3.1. Binary ............................................................................................. 93
4.3.2. 16-bits Word .................................................................................. 93
4.4. Data Model .......................................................................................... 94
4.5. Modbus Functions and Registers ........................................................ 95
4.5.1. 01 (0x01) Read Coils ..................................................................... 95
4.5.2. 02 (0x02) Read Discrete Inputs ..................................................... 96
4.5.3. 03 (0x03) Read Holding Registers ................................................ 97
4.5.4. 04 (0x04) Read Inputs Registers ................................................... 98
4.5.5. 05 (0x05) Write Single Coil ............................................................ 99
4.5.6. 06 (0x06) Write Single Register ................................................... 100
4.5.7. 15 (0x0F) Write Multiple Coils...................................................... 101
4.5.8. 16 (0x10) Write Multiple Registers .............................................. 102
4.6. Modbus Master Simulators ................................................................ 103
4.6.1. Modbus/TCP Client ...................................................................... 103
4.6.2. Modbus Master Tool .................................................................... 105
4.7. Modbus Demo Programs................................................................... 108
5.
Calibration .................................................................................. 109
5.1. Voltage and Current Calibration ........................................................ 109
5.2. Thermocouple Calibration ................................................................. 114
5.3. RTD Calibration ................................................................................. 115
5.4. Recover Calibration to Factory Setting .............................................. 117
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