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  1. #1
    Junior Member Junior
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    Default What does an RS-232C null modem cable look like?


    Soory for this strange question but I want to update my HUMAX receiver and I have never heard of this type of cable to connect it with my PC. What does it look like and in what slot do I insert it in my PC. Maybe I know it but I would like confirmation.

    Thanks a lot!

  2. #2
    Alexs2912
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    You don`t need a rs 232 nul modem because you will not be able to update your reciver.You need rs232 serial cabel. They do look the same but have different wire positoins.Read your reciver manual.(also rs 232 is femle to female cabel rs232 nul modem also)

  3. #3
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    on the contrary, you DO need a rs232 null modem cable for your upgrade. scroll down to "Simple RS232 null modem without handshaking" from this http://www.lammertbies.nl/comm/cable/RS-232.html#pins website and you should be able to understand how your cable should look like if you ever decide to make one for yourself (pretty easy, really). both ends are usually female.

    null = cross cable. read this:

    If you connect two DTE devices (or two DCE devices) using a straight RS232 cable, then the transmit line on each device will be connected to the transmit line on the other device and the receive lines will likewise be connected to each other. A Null Modem cable or Null Modem adapter simply crosses the receive and transmit lines so that transmit on one end is connected to receive on the other end and vice versa. In addition to transmit and receive, DTR & DSR, as well as RTS & CTS are also crossed in a Null Modem connection.
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  4. #4
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    Default ok

    Thank you guys for these useful tips

  5. #5
    bedjoker
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    This is RS-232


  6. #6
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    you should have given him a schematic of the wiring instead, pretty useless if you look at it from outside as most cables will look the same.
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  7. #7
    bedjoker
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    Quote Originally Posted by boknoy_ph
    you should have given him a schematic of the wiring instead, pretty useless if you look at it from outside as most cables will look the same.
    You already showed him that schematic, there's no need for me to repeat it. He asked: What does it look like? So, that's the picture..... Isn't it the right picture Mr. Expert Yonkob

  8. #8
    az30094
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    My receiver is having a male connector on it. So, my cable is from 9 pin male (receiver side) to 9pin female connector (pc side). None of the cable configurations shown in the link posted by mr. boknoy_ph works. My cable is a 1 to 1 with straight connections. That means pin 2 to 2, 3 to 3, 4 to 4, 5 to 5, 7 to 7 and 8 to 8. Pins 1 and 9 are left unused. This works perfectly for my configuration.

    I have posited this not to confuse others, but to help in case of other configurations fail.

    By the way, it does not harm to try any configuration. No hardware gets damaged.

  9. #9
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    @bedjoker,
    im not an expert, im simply trying to learn things.

    @az30094,

    thanks for the heads-up. you are right, not all receivers are using the cross-cable configurations (NHE patriot2 uses straight config too).
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