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
