Pinouts >  Serial interfaces cables and converters scheme
This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.
  Female Male Dir
Shield Ground   1  
Transmit Data 3 2 -->
Receive Data 2 3 <--
System Ground 5 7  
Jumper these:      
Request to Send 7   -->
Clear to Send 8   <--
Data Set Ready 6   <--
Carrier Detect 1   <--
Data Terminal Ready 4   -->
Request to Send   4 -->
Clear to Send   5 <--
Data Set Ready   6 <--
Carrier Detect   8 <--
Data Terminal Ready   20 -->
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
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Source(s) of this and additional information: Hardware Book
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