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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

1 – 65536

Discrete_Input

n/a.

1 – 65536

Input_Register

n/a.

1 - 65536

Holding_Register

For Address_Type PDU :

Address range

Data_Type

Function Code (Write)

Function Code (Read)

0 - 65535

FC01

0 – 65535

FC02

n/a.

0 – 65535

FC04

n/a.

0 – 65535

FC03

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

10001 - 19999

Discrete_Input

n/a.

30001 - 39999

Input_Register

n/a.

40001 - 49999

Holding_Register

6,16

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’

1 2 ... 16 17 18 19 20 21

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