Pilot Communications SPM93 - Communication Protocol; Introduction

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9. Communication Protocol
9.1. Introduction
This part describes the Modbus communications protocol employed by the SPM93
and how to pass information into and out of the SPM93 in a Modbus network.
9.1.1 Purpose of the Communication Protocol
The purpose of the SPM93 Modbus communications protocol is to allow setup
information and measured data to be efficiently transferred between a Modbus Master
Station and a DFPM93. This includes:
1) Allowing configuration and interrogation of all SPM93 set-up parameters from a
Modbus Master Station.
2) Allowing interrogation of all data measured by DFPM93.
9.1.2 Version of Communication Protocol
The version is proper for all DFPM93, which have leaved Pilot. If any change
happens later, it will be indicated.