Pinouts of Connectors

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 with hardware handshaking.

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

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 Modem (9-25) cable and layout of 9 pin D-SUB FEMALE connector and 25 pin D-SUB MALE connector

Source(s): Hardware Book, Sèren Graversen
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