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Thread: serial cable question

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    DILLIGAF GoNz0's Avatar
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    serial cable question

    i need a 9 pin female to female cable to hook my nas to my UPS, are all 9 pin rs232's the same as a lot seem to be badged as null modem, it needs to have all 9 pins connected and im not sure if i can get a null modem as they come in the 10m length i need as the UPS is in the loft ?

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    Re: serial cable question

    Quote Originally Posted by GoNz0 View Post
    are all 9 pin rs232's the same...
    Sadly not.

    Even "null modem" cables were not covered by a standard so you can get different ones. They usually have wires crossed in them (think of cross-over RJ45 cables).

    Non "null modem" cables are normally straight through cables.

    You need to check the manuals / spec sheets to fine out what you need
    Quote Originally Posted by Saracen View Post
    And by trying to force me to like small pants, they've alienated me.

  3. #3
    DILLIGAF GoNz0's Avatar
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      • Memory:
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    Re: serial cable question

    neither say what cables required, this is the pin outs for the ups though, it does seem to need some crossed


  4. #4
    DILLIGAF GoNz0's Avatar
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    • GoNz0's system
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      • Memory:
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      • Storage:
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      • Graphics card(s):
      • GTX980 Strix WC
      • PSU:
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      • Case:
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    Re: serial cable question

    it also appears the powerware 9125 has a female meaning i will need a male to female serial cable




  5. #5
    DILLIGAF GoNz0's Avatar
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    • GoNz0's system
      • Motherboard:
      • Asus Rampage V Extreme
      • CPU:
      • i7 something X99 based
      • Memory:
      • 16gb GSkill
      • Storage:
      • 4 SSD's + WD Red
      • Graphics card(s):
      • GTX980 Strix WC
      • PSU:
      • Enermax Galaxy 1250 (9 years and counting)
      • Case:
      • Corsair 900D
      • Operating System:
      • win10 64bit
      • Monitor(s):
      • Dell 24"
      • Internet:
      • 220mb Cable

    Re: serial cable question

    RS232 Pin Assignments (DB9 PC signal set)
    Pin 1 Received Line Signal Detector (Data Carrier Detect)
    Pin 2 Received Data
    Pin 3 Transmit Data
    Pin 4 Data Terminal Ready
    Pin 5 Signal Ground
    Pin 6 Data Set Ready
    Pin 7 Request To Send
    Pin 8 Clear To Send
    Pin 9 Ring Indicator

    if thats the pc side, and the diagram above is the UPS then it seems to be a straight through cable after all, not a null modem. so a straight forward extension cable should do the trick ?

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