9-2
IM WT310-17EN
9.2
Communication with Client Devices
List of Function Codes
This instrument supports the following function codes.
Code
Function
Description
03
Reads the hold register
Continuous reading from 0001 to 0010 is possible.
04
Reads the input register
Up to 125 values can be read continuously from 0001 to 3008.
06
Writes to the hold register
Writing is possible only to one register in the range of 0001 to 0010.
Specifying Registers
Registers are specified from a client device in the following manner.
• If an off-the-shelf SCADA or the like is used, specify the Ref No. (reference number) listed in
section 9.3, “Register Functions and Applications.”
• In the case of a communication program that you create, specify the H No. (relative number)
listed in section 9.3, “Register Functions and Applications.”
Example: To specify the voltage data of element 1 (float upper bytes) (input register: 0101)
• For a request using an off-the-shelf SCADA or the like, specify Ref No. 30101.
• For a request using a communication program that you create, specify H No. 0064.
