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Two-Wire Modem (9-25)

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

9 PIN D-SUB FEMALE (To Computer).
25 PIN D-SUB MALE (To Modem).

9 PIN D-SUB FEMALE to the Computer
25 PIN D-SUB MALE to the Modem

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 -->

Contributor: Joakim Ögren

Source:
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Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08