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Thread: APC serial cable pinouts

  1. #1
    Variable Bitrate
    Join Date
    Apr 2002
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    Charlotte, NC
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    APC serial cable pinouts

    I just got done talking with APC support. They told me that a plain jane serial cable won't work for connecting the UPS to my computer. The guy did reveal though, that the only difference between a regular cable and the APC propreitary cables is the pinout. Does anyone know what I'd have to do to convert my regular serial cable to a APC UPS cable?
    Silver 1999 Nissan Pathfinder!
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  2. #2
    Newbie
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  3. #3
    Variable Bitrate
    Join Date
    Apr 2002
    Location
    Charlotte, NC
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    Problem is, those don't make sense to me. I know enough to cut and splice wires, but that's about it. IF someone could tell me which pin on the PC side goes to which pin on the UPS side, that would really help.
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  4. #4
    Variable Bitrate
    Join Date
    Apr 2002
    Location
    Charlotte, NC
    Posts
    315
    http://www.connectworld.net/wwwboard/messages/3871.html

    Above link suggests that I need a resistor. None of the other pages mention it.

    ????
    Silver 1999 Nissan Pathfinder!
    Completion: [*********-] 90%
    Everything working! Mobile MP3s ROCK!
    LEFT TO DO: Improve power on circuit, fix slow boot time

    - 550mhz PIII on Abit BH6
    - 128MB RAM
    - 40x4 Backlit Character LCD
    - 17 key numeric keypad - Repainted buttons
    - 2.1GB laptop drive for OS
    - 4.3GB drive for MP3s

    http://www.mp3car.com/usersites/bombboyer/ Redesigned, new pics!

  5. #5
    Newbie
    Join Date
    Mar 2002
    Location
    KY
    Posts
    39

    Looks like you do need that resistor

    Here is the quote on how to make that cable:

    The above diagram indicates that Pin #5 on the PC serial port should be connected directly to pin 4 on the UPS side, pin 8 to pin 2, pin 4 to pin 1, and pin 1 to pin 5. In addition, pins 5 and 8 on the same side (the UPS side) have a 10k ohm (10,000 ohm) resistor connected between them. This resistor serves to pull the voltage on this non-RS-232 output high until an actual low voltage is generated by a low battery condition
    You can also check with Microsoft

    And putting a resistor inside of the cable is not a problem.

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