25 Pin Laplink Cable
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Thread: 25 Pin Laplink Cable

  1. #1
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    Post 25 Pin Laplink Cable

    I have just completed making my own rs-232 laplink cable.

    (handy for backups and laplink software)

    Below are the pinouts for the same.

    25 PIN D-SUB MALE to Computer 1.
    25 PIN D-SUB MALE to Computer 2.

    Name Pin Pin Name
    Data Bit 0 2 15 Error
    Data Bit 1 3 13 Select
    Data Bit 2 4 12 Paper Out
    Data Bit 3 5 10 Acknowledge
    Data Bit 4 6 11 Busy
    Acknowledge 10 5 Data Bit 3
    Busy 11 6 Data Bit 4
    Paper Out 12 4 Data Bit 2
    Select 13 3 Data Bit 1
    Error 15 2 Data Bit 0
    Reset 16 16 Reset
    Select 17 17 Select
    Signal Ground 25 25 Signal Ground


    Pretty easy to create this from 2 old printer cables etc.

    Enjoy.

    I appologise for the formatting.

    I formatted it perfectly but the forum message board seems to have re formated it for me.

    Appologies. I will put it in a word file. E-mail me if you can't make sense of the above.

  2. #2
    Just Another Geek
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    Re: 25 Pin Laplink Cable

    Originally posted here by mark_boyle2002
    Pretty easy to create this from 2 old printer cables etc.
    Aren't these female?
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  3. #3
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    No

    Think about it they go in the same connector at the back of the p.c don't they.

    P.S coming soon the 9 pin version.

  4. #4
    Just Another Geek
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    Re: 25 Pin Laplink Cable

    Originally posted here by mark_boyle2002
    I have just completed making my own rs-232 laplink cable.

    <.......snip....>

    Pretty easy to create this from 2 old printer cables etc.
    I hate to break this to ya, but these 2 connectors are definitely different.

    A printer (parallel) cable has a 25 pin sub-d male connector.
    A serial cable has a 25 pin sub-d female connector.

    This is to prevent ppl from plugging the wrong cable in the wrong port.

    These days most (all?) serial ports use a 9 pin port.

    edit: Looking at the pinout I see you mean the 25 pin parallel port. I got thrown off by the rs-232 at the top. RS-232 is serial.
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  5. #5
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    Doh,

    I know I put rs-232 but I couldn't edit this out later.

  6. #6
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    Humm most of my machines have 25 pin serial on them (then again I built most of them myself). and with the right tools (genderchangers) you could do this with a printer cable.

    Mark could have also been talking about the ungodly slow laplink over paralle connection

    You can also get littel boxes that change the pinout of a cable and create a crossover from a regular cable, these run prety cheap but I have forgoten the name. Most cableing catalogs will have them
    Who is more trustworthy then all of the gurus or Buddha’s?

  7. #7
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    Lightbulb

    in a 25 way you can get away with just wiring 2, 3 & 7 and in 9 way you can just wire 2, 3 & 5.

    (txd, rxd & gnd and rxd, txd and gnd)

    this can get you out of a hole if you are in a rush and cant be arsed to wire the whole lot using serial cable.

    its particularly useful if you have any 25 or 9 way to rj-45 connectors lying around as you can just do it using these and cat5e patch leads.

    bit of a bodge, but a quick fix that has helped me out from time to time.

  8. #8
    Just Another Geek
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    Originally posted here by atomiser
    in a 25 way you can get away with just wiring 2, 3 & 7 and in 9 way you can just wire 2, 3 & 5.

    (txd, rxd & gnd and rxd, txd and gnd)
    Yep. Just a simple null-modem cable with no hardware handshake. If you connect 4&5 (rts,cts on a 25 pin con.) to 5&4 on the other end you can also use hardware (rts/cts) handshaking.

    Originally posted here by bballad
    You can also get littel boxes that change the pinout of a cable and create a crossover from a regular cable, these run prety cheap but I have forgoten the name. Most cableing catalogs will have them
    This is called a breakout box
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  9. #9
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    9 to 25 pin null modem

    D-Sub 9 D-Sub 25
    Recieve Data 2 2 Transmit Data
    Transmit Data 3 3 Recieve Data
    Data Terminal Ready 4 6+8 Data Set Ready + Carrier Detect
    System Ground 5 7 System Ground
    Data Set Ready + Carrier Detect 6+1 20 Data Terminal Ready
    Request to Send 7 5 Clear to Send
    Clear to Send 8 4 Request to Send

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