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 <--
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the Computer
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the modem
According to 8 reports in our database (6 positive and 1 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: Hardware Book, S?ren Graversen
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