Servomex 07931001B, Operator'S Manual

Page: 191 / 221

07931001B revision 6 © Servomex Group Limited. 2020
177
12. Appendix Modbus setup
12.1 Implementation guide for Modbus communications
Introduction
This appendix details the implementation and use of the Modbus protocol in the analyser.
Supported function codes
For simplicity, only the following function codes will be supported.
Function Description Usage
01 Read coils Read calibration status, pump state, etc.
02 Read discrete inputs Read faults and alarm states.
03 Read holding registers Read settings.
04 Read input registers Read measurements, units, etc.
05 Write single coil Change modes, perform calibration etc.
06 Write single register Change single setting.
08 Sub Function
00 = Return
query data
Diagnostic to test communications.
16 Write multiple registers Change multiple settings.