串行直连电缆25针-25针(NullModem)引脚定义图

串行直连电缆 25针-25针(NullModem)

串行直连电缆用于两台计算机的直接相连，电缆两端的插头都是 25 针母插头：

 

引脚定义

	D-Sub 1	D-Sub 2
Receive Data	3	2	Transmit Data
Transmit Data	2	3	Receive Data
Data Terminal Ready	20	6+8	Data Set Ready + Carrier Detect
System Ground	7	7	System Ground
Data Set Ready + Carrier Detect	6+8	20	Data Terminal Ready
Request to Send	4	5	Clear to Send
Clear to Send	5	4	Request to Send