Bacharach AGM300, ADM800 manual RS-485 Communication Protocol, Modbus RTU Protocol

Models: AGM300 ADM800

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RS-485 Communication Protocol

Overview

The following instructions are intended as a guide for integrating the AGM300 network into a Building Management System. If you are unfamiliar with complex systems of this type, it is recommended that you contact Bacharach for technical assistance.

MODBUS RTU Protocol

The AGM300 monitor communicates with master devices (such as the ADM800 or a Building Management System) over the RS-485 serial interface. The monitor is configured with a two wire RS-485 serial bus, and therefore, data transmission occurs in ‘half-duplex’ mode. Consequently, only one device may be in transmit mode at any given time.

Programmers should refer to the MODBUS Protocol Reference Guide for details and more comprehensive instructions. The guide is available on the Modicon web site at: http://www.modicon.com/techpubs/TechPubNew/PI_MBUS_300.pdf

Specific communication software is available at: http://www.bacharach-inc.com/downloads.htm

Instruction 3015-4275

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Page 75
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Bacharach AGM300, ADM800 manual RS-485 Communication Protocol, Modbus RTU Protocol