Options; Modbus - Honeywell Sensepoint XCD RFD Technical Manual

Remote flammable detector

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Sensepoint XCD RFD Technical Manual

SPXCDHMRFENU Issue 1

4.4 Options

One of the most common field buses in the industry, the optional Modbus

interface allows

the XCD to connect to a bus of devices and transmit data to PLCs or controllers (see

Appendix A). Connections to the XCD are made through a pluggable terminal block on

the Modbus

interface circuit board. Modbus

RTU protocol uses ASCII/Hex protocols for

communication. And allows all transmitter/sensor front panel functions to be transmitted

using this industrial fieldbus.

Modbus

protocol is a Master-Slaves protocol. Only one master (at the same time) is

connected to the bus and one or up to 32 slave nodes are also connected to the same

serial bus. Modbus

communication is always initiated by the master. The slave nodes will

never transmit data without receiving a request from the master node. The slave nodes

will never communicate with each other. The master node initiates only one Modbus

transaction at the same time.

The MODBUS may only be used for data collection or record keeping with regard to

combustible gas detection and not for performance verification.

Modbus option is available only for selected gases. Please refer to chapter 15 Ordering

information.

To find out if a unit has the ModBus option fitted, look at the part number on the product

label. Units fitted with ModBus have the letter "M" at the end of the part number.

Note: MODBUS

is a registered trademark of Schneider Automation Inc.

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