Article ID: 98885 - Last Review: November 1, 2006 - Revision: 3.1

Pin Connections for Cabling Between APC UPS and RS-232

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SUMMARY

If you are having difficulty getting your American Power Conversion (APC) uninterruptable power supply (UPS) system to work with Windows NT, it may be due to the serial cable you are using. The following information applies to APC Back-Ups models 250, 400, 450, 600, 900, and 1250.

Make sure the following pins are connected: 
   DB9 9-Pin Female Connector              DB9 9-Pin Male Connector
      (to PC serial port)                    (to UPS connector)
   ----------------------------------------------------------------
      Pin #5----------Ground------------------Pin #4
      Pin #8----------Power Failure-----------Pin #2
      Pin #4----------UPS Shutdown------------Pin #1
      Pin #1----------Low Battery---------Pin #5--[10k ohm]--Pin #8
Note: unlisted pins need not be connected.

MORE INFORMATION

APC provides a cable that correctly connects their power supply unit to a PC. You can contact APC and order part #940-0020B.
APPLIES TO
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
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kbhardware KB98885