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Help finding a serial cable (RS232)

Discussion in 'Electronic Design' started by mpm, Nov 28, 2007.

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  1. mpm

    mpm Guest

    Anyone know where I can find a supplier for pre-made RS232 serial
    cables with a DB-9 Male on one end, and a 3.5mm plug on the other?

    Or...? Doesn't have to be 3.5mm, that's just the first thing that
    comes to mind.

    I'm on a new project that will need a serial port and want to shave
    cost of the DB9 on the product end. (Also, tooling would be a slight
    hassle as the PacTec enclosure I'm going to use would have to hacked
    up a bit, whereas panel mounting a 3.5mm jack is no big deal.)

    Ideally, a 3-foot to maybe 5-foot pre-assembled RS-232 to 3.5mm (mini-
    phono) type plug would fit the bill. I only need TXD, RXD and ground
    (common). How it pins out on the plug is not critical as it will
    likely be panel mount anyway - although I suspect there's a "standard"
    here.

    Even RS232 DB9 Male to bare wire would be considered and I'll make the
    plugs myself.
    Not my first choice, however. But acceptable in early production.

    Thanks!!
    -mpm
     
  2. Jamie

    Jamie Guest

    You would be better off getting a roll of wire and connectors..

    Pricing for molded serial cables are all over the place.
    http://www.connectworld.net/iss//molded-rs232-cables.html
    check there.
    They seem to have some good prices on cheap molded serial cables.
     
  3. mpm

    mpm Guest

    I've seen (3) products - at least!! that use the type of cable I'm
    looking for:
    An old Philips "Pronto" universal remote control, my dad's brand new
    Bayer Ascenture blood glucose meter, and a Boxcar (sp?) data
    acquisition gizmo that looked like a pager.

    I have a contact who does the China import thing and I'm sure he'll
    have it... I'm just not ready to buy a few thousand of 'em yet. Which
    is where that usually leads... I tried the Google route but after
    sifiting though a dozen or so sites I gave up. I think this is the
    kind of thing you either know where to get it, or you're stuck. So
    far, I'm stuck.

    But thanks for the lead. If push comes to shove, I guess I can hack
    off one end and wire it to a plug. At least half the work would be
    done for me.....
     
  4. Bill Brown

    Bill Brown Guest

    We buy our cables from PCH Cables in Oregon. (www.pch.com) They show a 6 ft
    double ended DB9 male for $1.95 each, Qty 1. As someone's post suggested,
    they could be cut in half and the 3.5 mm plug put on.

    We have used this company for a couple years and have been very happy with
    their price and fast delivery.

    bill
     
  5. Eeyore

    Eeyore Guest

    Don't even consider it.

    3.5mm jacks are as noisy and simply generally unreliable as they come.

    Graham
     
  6. budgie

    budgie Guest

    Consider a male-male D lead, and hack it in half to apply the 3.5mm stereo
    plugs. At least that reduces the waste (cost).
     
  7. mpm

    mpm Guest

    Now, there's some thinking! Thanks!
    Still, I'd rather find the cable already made - and obviously they are.
     
  8. mpm

    mpm Guest

    That's a good point, but I can always spec a higher quality jack.
    And supervise the data with XON/XOFF, retransmit, etc.. I'm not too
    worried about handling data corruption. It's not a lot of data, and
    can be slowed down if/as needed.

    What connector would you use?
     
  9. Eeyore

    Eeyore Guest

    Well, if you want cheap, a 1/4" 'phone' jack is vastly better than its smaller
    cousin. I'd have no reservations there.

    Graham
     
  10. JosephKK

    JosephKK Guest

    mpm posted to sci.electronics.design:
    My cell phone has a 3 contact version of the 2.5 mm power plug. There
    is a detent in the outer ring contact to help with reliable
    connections.
     
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