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  1. #1
    *Registered User* muzzlitebeer's Avatar
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    Default diy parallel printer cable question

    I can't find a male/male printer cable anywhere other than online. Trouble is, all my bits have arrived today and I want to get my Gecko up and running this weekend.

    I was lucky enough to be donated an old printer cable and bought a male DB25 assembly from Jaycar electronics. I've now successfully rewired the female end and checked continuity with a DMM.

    Here's my question; The Gecko manual describes pins 18-25 as "GND" but, although this printer cable has a jumper across pins 19 to 25, they're not actually 'grounded', just joined to each other. There is a conductor that connects the shell at one end to the shell at the other. Should pins 18-25 be grounded to the shell or am I right to go?

    Could someone please check their cable to see if there's continuity between these pins and the shell?

    Cheers in advance.

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    Registered CitizenOfDreams's Avatar
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    Default Re: diy parallel printer cable question

    If the cable is shielded, solder the shield wire to the shell. If not, just leave the shell unconnected.



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    Community Moderator ger21's Avatar
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    Default Re: diy parallel printer cable question

    I believe that in an actual printer port, the pins and shell are tired to the same ground.

    Gerry

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    Gold Member john-100's Avatar
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    Default Re: diy parallel printer cable question

    on a PC motherboard the printerport socket

    the metal shell & pins 18 to 25 are all connected together and
    via the ATX power supply black 0V wires to the mains supply earth / ground

    if you can only find a printer extension cable (f/m)

    you could of use a gender changer like this:-
    diy parallel printer cable question-gender-changer-male-male-25-way-spc19825

    https://cpc.farnell.com/multicomp/sp...xoCx1YQAvD_BwE

    to save changing the connector on your cable !


    some cheap printer cables don't have 25 wires inside
    so they connect terninals 18 to 25 together to use 1 wire instead of 8 !

    this is not a problem with the Gecko G540 or most breakout boards

    as long as a printerport ground pin (18 to 25) is connected to a G540 ground pin (18 to 25 )
    it will work


    as far as I remember
    the CNC4PC C10 breakout board is unusual

    pins 19 to 25 are all ground as expected
    but pin 18 is used to detect when the board connected to the PC printer port
    (or motion controller like the smooth stepper )


    John



  5. #5
    *Registered User* muzzlitebeer's Avatar
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    Default Re: diy parallel printer cable question

    Thanks for the help guys.

    Cheers



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