Microsoft KB Archive/108296

= 9-to-25 Pin RAS Null Modem Cabling =

Article ID: 108296

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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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)

Additional query words: prodnt nul

Keywords: kbnetwork KB108296

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