FS-8700-01_Modbus_RTU_(T28700-01) Driver Manual Page 15 of 21
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Appendix A. Advanced Topics – Modbus RTU Appendix A.1. Data Types
If Node parameter Address_Type is set as ADU or PDU, then Data_Type must be specified
as follows
For Address_Type ADU :
Address range Data_Type Function Code (Write) Function Code (Read)
1 - 65536 Coil 15 1
1 – 65536 Discrete_Input n/a. 2
1 – 65536 Input_Register n/a. 4
1 - 65536 Holding_Register 16 3
For Address_Type PDU :
Address range Data_Type Function Code (Write) Function Code (Read)
0 - 65535 FC01 15 1
0 – 65535 FC02 n/a. 2
0 – 65535 FC04 n/a. 4
0 – 65535 FC03 16 3
For Address_Type Modicon_5digit
When a Modbus address range is specified, a particular Data Type is implied. The defaults
are as follows:
Address range Data_Type Function Code (Write) Function Code (Read)
40001 - 49999 Register 16 3
30001 - 39999 Analog _Input n/a. 4
10001 - 19999 Digital_Input n/a. 2
00001 - 09999 Coil 15 1