串口针脚图

 http://www.moxa.com.cn/product/accessories/Serial_Pinouts.htm

载波检测(DCD)
接受数据(RXD)
发出数据(TXD)
数据终端准备好(DTR)
信号地线(SG)
数据准备好(DSR)
请求发送(RTS)
清除发送(CTS)
振铃指示(RI)

RS-232 — DB9孔式 （female）

Pin No. Signal 1 DCD 2 TxD 3 RxD 4 DSR 5 GND 6 DTR 7 CTS 8 RTS 9 ---

RS-232 — DB9针式(male)

Pin No. Signal 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 ---

RS-232 — DB25孔式(female)

Pin No. Signal 2 RxD 3 TxD 4 CTS 5 RTS 6 DTR 7 GND 8 DCD 20 DSR

RS-232 — DB25针式(male)

Pin No. Signal 2 TxD 3 RxD 4 RTS 5 CTS 6 DSR 7 GND 8 DCD 20 DTR

RS-232 — RJ45(8 pin)

Pin No. Signal 1 DSR 2 RTS 3 GND 4 TxD 5 RxD 6 DCD 7 CTS 8 DTR

RS-232 — RJ45(10-pin)

Pin No. Signal 1 DCD 2 DSR 3 RTS 4 GND 5 TxD 6 RxD 7 GND 8 CTS 9 DTR 10 ----

RS-422 — DB25孔式(female)— for Opt8F/Z

Pin No. Signal 2 RxD+(B) 3 TxD+(B) 7 GND 14 RxD-(A) 16 TxD-(A)

RS-422/485 — DB25孔式(female)— for Opt8K

Pin No. RS-422 signal RS-485 signal 2 RxD+(B) Data+ 3 TxD+(B)   7 GND   14 RxD-(A) Data- 16 TxD-(A)