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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 4 / 67
1 Modbus RTU general information
1.1 Introduction
This document describes in detail the pH ARC Sensors Modbus RTU interface. It is addressed to
software programmers.
The general information about Modbus command structures and its implementation in the HAMILTON
ARC Sensor family is described in detail in Chapter 1 of the
“VISIFERM DO Modbus RTU Programmer’s Manual”(p/n 624179/01).
If you need this general information about Modbus programming, then please consult p/n 624179/01.
In the present manual, only the specific command structure for the pH ARC Sensors is described. It is
valid for the firmware version:
EPHUM011
Please check the software version by reading register 1032.
This present definition of the command structure is an additional document to the Operating
Instructions of the specific pH ARC Sensors. Before reading this manual, the operating instructions of
the sensors should be read and understood.