Modbus Communication Interface | A-1
MODBUS COMMUNICATION INTERFACE
OVERVIEW
This document describes the customer serial communication interface on Model 3050 ana-
lyzer. The communication protocol implemented is Modicon Modbus as deined in “Modicon
Modbus Protocol Reference Guide” (PI-MBUS-300 RevJ). The Modbus protocol transmission
mode implemented is Remote Terminal Unit (RTU) with the analyzer operating as a slave
device.
The AMETEK 3050 analyzer supports both RS485 and RS232 serial communication stan-
dards.
The physical communication connection between a Model 3050 analyzer and a customer
DCS\SCADA\PLC\DAS or a general-purpose computer is RS485 or RS232. The analyzer
RS485 connection supports both 4-wire and 2-wire multi-drop systems. The RS232 connec-
tion is used to communicate with a single analyzer using short standard cable.
The 3050 analyzer understands two serial communication protocols. The irst protocol is
a proprietary ASCII serial communication protocol. This protocol is supported by AMETEK
3050 Conigurator program, which supplied with the each analyzer. This program provides a
graphical user interface to set up all the analyzer parameters as explained in Chapter 3.
The variable called SerialMode allows switching communication protocol from AMETEK
ASCII to MODBUS protocol and back from MODBUS to AMETEK ASCII. This variable can be
reached from AMETEK ASCII protocol by ID=38(26Hex) and SerialMode can be modiied by
modifying holding register #28(4029), as indicated in the holding registers table.
Serial mode variable could be set as follows:
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