Linking PC to FX5U via RS485 protocol

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If the user wants to use the FX5U as the slave device, MELSOFT Connection should be chosen as the communication protocol.
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I was trying to connect FX5U with PC via RS485. And is it right for Gx-Works3 to use RS232 to connect the FX5U to the PC? So i was wringing [PC <-> USB to RS232 <-> RS232 to RS485/422 <-> PLC(RS485) ]. Wiring the rs232 to rs485/422 to PLC [SDA, RDA <-> TX+], [SDB, RDB <-> TX-]. But it is not working. Could you help me?

mingyuyoon
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This method is not working... Please help..

HIMANSHUKUMAR-riii