2、3GND4TxD5RxD6DCD7CTS8DTRRS-232—RJ45(10-pin)PinNo.Signal1DCD2DSR3RTS4GND5TxD6RxD7GND8CTS9DTR10----RS-422—DB25孔式—forOpt8F/ZPinNo.Signal2RxD+(B)3TxD+(B)7GND14RxD-(A)16TxD-(A)RS-422/485—DB25孔式—forOpt8KPinNo.RS-422signalRS-485signal2RxD+(B)Data+3TxD+(B) 7GND 14RxD-(A)Data-16TxD-(A) PC