Pinouts of Connectors

Two-Wire Modem (9-25) cable pinout

layout
schematic diagram
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This cable should be used for DTE to DCE (for instance computer to modem) connections without hardware handshaking.

9 pin D-SUB FEMALE connector pin-out & layout
9 pin D-SUB FEMALE connector  to the Computer
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 -->

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25 pin D-SUB MALE connector pin-outs & layouts
25 pin D-SUB MALE connector  to the Modem
Pinouts.ru > Pinouts of modem cables >  Pinout of Two-Wire Modem (9-25) cable and layout of 9 pin D-SUB FEMALE connector and 25 pin D-SUB MALE connector

Source(s): Hardware Book
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