ET-7X00/PET-7X00 User Manual, version 1.1.2 III
Copyright © 2014 ICP DAS CO., LTD. All Rights Reserved. E-mail: [email protected]
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/IP ................................................................. 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
6.
MiniOS7 Utility Tools ........................................................................... 118