ICP DAS USA WF-2000 Series User Manual page 4

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4.2.3 PC Connection Test........................................................................ 39
4.2.4 Pair Connection Test ...................................................................... 42
5. Modbus Applications ......................................................................45
5.1 What is Modbus TCP/IP?................................................................. 45
5.2 Protocol Description......................................................................... 45
5.2.1 MBAP ............................................................................................. 46
5.2.2 Function Code................................................................................ 46
5.2.3 Data................................................................................................ 47
5.2.4 Response ....................................................................................... 47
5.2.5 Data Encoding................................................................................ 48
5.3 Address Mapping ............................................................................. 50
5.3.1 WF-2055 I/O and Counter Address Mapping ................................. 50
5.3.2 WF-2060 I/O and Counter Address Mapping ................................. 51
6. Troubleshooting..............................................................................52
WF-2000 Series Wi-Fi I/O User's Manual (Ver. 1.0, Sep./2012) ------------- 4