GE 531X189LTBALG1 Process Interface General Electric Board

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The Modbus/RTU protocol uses a Master/Slave protocol that can support

a common bus of one master and up to 247 Modbus Slaves. That common

bus can be extended from direct wiring to radio and telephone modems.

As a RTU master, commands are constructed and issued to an addressed

slave.Only the addressed slave is expected to respond to the command.

Message integrity is assured through use of checksums included in a message.

Should a slave receive a message with a bad checksum, no response is

returned. This master provides a configurable modem turn around time-out

parameter and retries sending the message twice. 

Before the RTM can send acceptable RTU commands, it must be configured

to the frame protocol usedby the slave RTU’s (or interfacing modems)

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