Name: Pilot Communications SPM33
Brand: Pilot Communications
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8. Communication protocol

8.1. Introduction

This document describes the input and output command, information and data

of the SPM33 under MODBUS communication mode. So it is convenient for the

part using and developing.

8.1.1 Purpose of the Communication Protocol

The purpose of the SPM33 MODBUS communications protocol is to allow setup

information and measured data to be efficiently transferred between a

MODBUS Master Station and SPM33. It includes:

1) Allowing setting and reading all SPM33 set-up parameters from a MODBUS

Master Station.

2) Allowing reading all data measured by a SPM33 and SOE (Event log).

8.1.2 Version of Communication Protocol

This document is proper for all versions of SPM33 meters. It will be declared, if

any change happens later.

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Pilot Communications SPM33 Specifications

General