Ritron DATAFLOW RTU Series Podręcznik Użytkownika Strona 50

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DATAFLOW RTU
EXAMPLE 8
8.9 EXAMPLE 8 illustrates the DATAFLOW RTU performing a MODBUS modem function.
Configuration files EXP8ID1 and EXP8ID2 allow two MODBUS devices to communicate with
each other by RF. This configuration can connect two PLCs (MODBUS protocol) to
communicate with each other over RF, as long as one PLC is a master and the other is a slave
with an ID of 3.
No set-up or wiring diagram is provided with this example.
8.9.1 These files configure one RTU to be ID 1 and the other RTU to be ID2. These two RTUs will
take MODBUS commands generated on the RS-485 link and transmit them over RF. When this
RF message is received by the other RTU, the message is sent out the RS-485 link. Because
this message traffic is in both directions, either RTU may be connected to
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( B-25 )
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