FieldServer FS-8700-08 - Manual (Page 21)

FS-8700-01 Modbus RTU/ASCIIFS-8700-01_Modbus_RTU.doc Driver Manual Page 21 of 21
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Appendix D. Reference
Appendix D.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)
00001 - 09999 Coil 5,15 1
10001 - 19999 Discrete_Input n/a. 2
30001 - 39999 Input_Register n/a. 4
40001 - 49999 Holding_Register 6,16 3
Appendix D.2. Single Writes
If writing multiple registers the write function will 16
If writing multiple coils the write function will 15
If writing a single register the write function will be 6 unless Write_FNC parameter is set to “Multiple’
If writing a single coil the write function will be 5 unless Write_FNC parameter is set to “Multiple’