Honeywell Sensepoint XCD RFD User Manual

Sensepoint XCD RFD Technical Manual SPXCDHMRFEN Issue 4_08-2016
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XCD Transmitter
Appendix A - Modbus® Protocol A-2
A.1 Modbus and the XCD
The XCD gas detector may be fitted with the optional Modbus board. Authoritative
information on the MODBUS Upgrade Kit can be found at www.modbus.org. The XCD
supports Modbus/RTU over an RS-485 physical layer. The interface is isolated and
includes a switchable 120 Ohm termination resistor. Baud rates 9600 or 19,200 are
supported with 19,200 as the default. Most of the operations that are possible with
local user interfaces can also be performed using the Modbus interface. This includes
configuration operations. However, this Appendix only describes how to monitor XCD
status using Modbus.
See Section 4.1.1 for information on installing the optional Modbus hardware. See Section
4.1.1 Congure Menu – Set ID Settings for information on setting the Modbus baud rate
and Parity using the local user interface.

Honeywell Sensepoint XCD RFD Specifications

General

Brand	Honeywell
Model	Sensepoint XCD RFD
Category	Security Sensors
Language	English