9-to-25 Pin RAS Null Modem Cabling (108296)
The information in this article applies to:
- Microsoft Windows NT Server 3.1
- Microsoft Windows NT Workstation 3.1
- Microsoft Windows NT Advanced Server 3.1
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Workstation 4.0
This article was previously published under Q108296 SUMMARY
The Windows NT Remote Access Help file includes tables showing the correct
wiring of a null modem cable for use with RAS. The two tables included show
the correct wiring for a 9-pin null modem cable and a 25-pin null modem
cable. The following table contains the proper null modem wiring that must
be used when the cable connects a 9-pin serial port to a 25-pin serial
port.
25-pin Connector to 9-pin Connector
----------------------------------------------------
2 (transmit data) <-> 2 (receive data)
3 (receive data) <-> 3 (transmit data)
4 (request to send) <-> 8 (clear to send)
5 (clear to send) <-> 7 (request to send)
6,8 (data send ready,
carrier detect) <-> 4 (data terminal ready)
7 (ground) <-> 5 (ground)
20 (data terminal
ready) <-> 6,1 (data send ready,
carrier detect)
| Modification Type: | Major | Last Reviewed: | 8/8/2001 |
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| Keywords: | kbnetwork KB108296 |
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