Honeywell Sensepoint XCD Technical Manual page 79

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Sensepoint XCD Technical Manual

SPXCDHMANEN Issue 15

Appendix A - Modbus® Protocol A-2

A.1 Modbus and the Sensepoint XCD

The Sensepoint XCD gas detector may be fitted with the optional Modbus board. Information on the

Modbus Upgrade Kit can be found in chapter 14 Ordering Information. The Sensepoint XCD supports

Modbus/RTU over an RS-485 physical layer. The interface is isolated and includes a switchable 120

Ohm termination resistor. Baud rates 9,600 or 19,200 are supported with 19,200 as the default. Most of

the operations that are possible with local user interface can also be performed over the Modbus

interface.

See chapter 5.2 and 5.7 for information on installing the optional Modbus hardware. See chapter 12.3.3

Configure Menu – Set ID Settings for information on setting the Modbus baud rate and parity using the

local user interface.

The suggested polling interval is 0.2 to 1 seconds depending on cable type, length and connected nodes.

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