Future Design MCT-CM, User Manual

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MCT-CM
194
11.2 Serial Communications Option
The MCT serial interface uses Modbus RTU protocol. Any device used to communicate with the MCT over the
serial interface must use this protocol.
The MCT communication address and parity can be set on the communications screen. All other
communication settings are fixed. The port settings of the device used to communicate with the MCT must be
set to match in order for the communications to take place.
Address:
1-247 (user selectable)
Baud Rate: 9600
Data Bits:
8
Stop Bits: 1
Parity: None, Odd, Even (user selectable)
The Modbus address is used to identify the MCT on the serial link. When a multi-drop connection is used, each
controller on the link must have a different address so that each one can be identified separately. If two or more
MCT controllers have duplicate addresses, communications with those controllers will fail because they will
each try to respond to the same message. For single MCT connections, the address only needs to match that
of the commands being sent from the host device.