Modem Cable Pinout -
Female Male Dir
Shield 1 -
Transmit Data 3 2 OUT
Receive Data 2 3 IN
Request to Send 7 4 OUT
Clear to Send 8 5 IN
Data Set Ready 6 6 IN
System Ground 5 7 -
Carrier Detect 1 8 IN
Data Terminal Ready 4 20 OUT
Ring Indicator 9 22 IN
Female Male Dir
Shield Ground 1 1 -
Transmit Data 2 2 OUT
Receive Data 3 3 IN
Request to Send 4 4 OUT
Clear to Send 5 5 IN
Data Set Ready 6 6 IN
System Ground 7 7 -
Carrier Detect 8 8 IN
Data Terminal Ready 20 20 OUT
Ring Indicator 22 22 IN

9 pin D-SUB female connector layout 25 pin D-SUB male connector diagram
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