Sensepoint XCD Technical Manual SPXCDHMANEN Issue 15
13
Options
3.3.1. Modbus
®
Note: Modbus
®
option is NOT tested as part of the performance approvals.
The optional Modbus
®
interface is one of the most common field buses in the industry and allows the
Sensepoint XCD to connect to a bus of devices and transmit data to PLCs or controllers (see Appendix
A). Connections to the Sensepoint 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.
Modbus
®
option is available only for selected gases. Please refer to chapter 14 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.
To Next Page
Loading...
