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Having trouble with a simple cable

Discussion in 'General Electronics Discussion' started by qoncept, Feb 17, 2012.

  1. qoncept

    qoncept

    1
    0
    Feb 17, 2012
    I'm not much of an electronics guy so hopefully someone that has a clue can help me out. I have a slotcar set that features a "PC-Link" cable (for $80) which is really just an FTDI RS232 virtual com port. I had one of the FTDI cables laying around already, so I bought a mini-din connector and a d-sub and made an adapter.

    The problem I'm having is that the control unit at the track wants 5v. Using this guide I chose pin 7 RTS (which it maps to a normal mini-din 5v) which, after it didn't work, found is actually about 9v. I figured it would probably still work, but one of the guys on the slotcar forum said it needs to be 5v.

    My question is... how do I get 5v? Is there a different pin I should be using? Do I just add a resistor on that pin? Do I need to get power somewhere else entirely?
     
    Last edited: Feb 17, 2012
  2. Rleo6965

    Rleo6965

    585
    9
    Jan 22, 2012
  3. shrtrnd

    shrtrnd

    3,646
    446
    Jan 15, 2010
    I'd do some more digging for information about how that $80 cable is wired.
    It might be wired for some special configuration, it may have components in the
    connector assembly to drop the voltage. Maybe they put a 29 cent part in their cable
    assembly, that makes it different enough from your spare cable, that they believe they
    can get the $80 from uninformed people for.
    A simple resistor installed in the connector could drop the voltage.
     
  4. RonJay

    RonJay

    3
    0
    Feb 13, 2012
    Hi Qoncept,
    Make sure that you are using the appropriate null modem or straight cable.
    Just a thought,
    Peace,
    Ron
     
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