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9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the Computer
This cable should be used for DTE to DCE (for instance computer to modem) connections with hardware handshaking.

Modem DSUB9 to DSUB25 cable

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

Modem DSUB25 to DSUB25 cable

  Female Male Dir
Shield Ground 1 1 ---
Transmit Data 2 2 -->
Receive Data 3 3 <--
Request to Send 4 4 -->
Clear to Send 5 5 <--
Data Set Ready 6 6 <--
System Ground 7 7 ---
Carrier Detect 8 8 <--
Data Terminal Ready 20 20 -->
Ring Indicator 22 22 <--
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the modem
Pinout status: +6 -1
According to 8 reports in our database (6 positive and 1 negative) the Modem cables pinout should be correct.

Is this pinout
NO DIY devices
Modem cables visual pinout:click to enlarge
Source(s) of this and additional information: Hardware Book, S?ren Graversen
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