所属产品线：
Modicon Quantum解决方法：
RS232: 1: DTR / 2: DSR / 3: TXD / 4: RXD / 5: GND / 6: RTS / 7: CTS / 8: Optinal PE
RS422: 1: RxD- / 2: RxD+ / 3: TxD+ / 6: TxD- / 5: GND / 8: Optinal PE
RS485: Pin 1 and 6 短接为正, Pin 2 and 3 短接为负，5为GND
是否有帮助？
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RS232: 1: DTR / 2: DSR / 3: TXD / 4: RXD / 5: GND / 6: RTS / 7: CTS / 8: Optinal PE
RS422: 1: RxD- / 2: RxD+ / 3: TxD+ / 6: TxD- / 5: GND / 8: Optinal PE
RS485: Pin 1 and 6 短接为正, Pin 2 and 3 短接为负，5为GND
是否有帮助？