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How to establish Modbus communication between two Modicon M238 Controllers.

Refer to attached sample project for Modicon M238 contoller( Master)write output of the M238 Master/Slave controller and the M238 Master/slave  
controller write output of the M238 Master controller via SL1 (Serial Port1) and a RS485 modbus cable VW3A8306R30.
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