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nullmodem connection
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Thread: nullmodem connection

  1. #1
    Guest

    nullmodem connection

    How hard is it to setup a serial null modem connection in redhat7.3? I might need one in the immediate future to connect to a console (no keyboard or monitor connected to it) to repair a hpux load on a scsi hard drive.

  2. #2

    Re:nullmodem connection

    it would be as easy as anything, all a null modem does is switch the placement of wires such that the uart can connect to another uart. after that set up minicomm and you should be set.

  3. #3
    Moderator
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    Schotty's Avatar
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    Re:nullmodem connection

    I would have to agree with pbharris. It should be a breeze.

  4. #4

    Re:nullmodem connection

    schotty agrees! i would say you can take our advice to the bank!

  5. #5
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    Re:nullmodem connection

    Let us know what it cashes in for then

  6. #6
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    Paradise, Ca
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    Re:nullmodem connection

    Code:
    Common Null-Modem Connection
    Signal Name             DB-25 Pin DB-9 Pin        DB-9 Pin DB-25 Pin  
    FG (Frame Ground)             1                            1                            FG
    TD (Transmit Data)              2       3                   2               3           RD
    RD (Receive Data)              3        2                   3               2           TD
    RTS (Request To Send)      4        7                   8               5           CTS
    CTS (Clear To Send)           5        8                   7               4           RTS
    SG (Signal Ground)             7        5                   5               7           SG
    DSR (Data Set Ready)         6        6                   4             20          DTR
    CD (Carrier Detect)              8        1                   4             20          DTR
    DTR (Data Terminal Ready) 20      4                    1              8           CD
    DTR (Data Terminal Ready) 20      4                    6              6           DSR

  7. #7
    Guest

    Re:nullmodem connection

    Here is what Im working on. Monday night I start my new job with Lockheed Martin working on HP J9000 computers, vme processors, and some other stuff running hpux 10, in a ruggedized rack for military use (on Navy ships). One of the consoles is a dual processor seutp, but not in the normal sense. It has 2 seperate mobos (which are very slow), the bottom one is connected to the monitor and keyboard and network , while the top one is connected to the network also, but no monitor or keyboard. So, I need to build a serial nullmodem cable with a special military connector on one end, and then setup my redhat laptop to talk to it for doing a reload through an external scsi drive. Whew. Thanks that it. I will let you all know how it goes when I get everything put together.

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