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RS-232 Keypad?

Discussion in 'Misc Electronics' started by plh, Sep 11, 2003.

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  1. plh

    plh Guest

    I have been looking for simple low cost Keypads w/RS-232 output. What are some
    good manufacturers? Looking on the Web I keep ending up at Amazon or Ebay, but I
    want to call up (someone who knows the product) before buying. I need to have at
    least 3 keys but more, say digits 0-9, would not hurt. Needs to have 9 pin
    serial output. (Or 24 but pref. 9. Or I could use an adapter it it came with a
    USB connector.)
    Use is for part of a Statistical Process Control system that is already set up
    w/RS-232. Presently this is set up for digital measuring instruments using the
    smart switch 232BBS4 from B&B Electronics (they don't have anything like I
    describe above, I asked.). In any case not all measurements are suited for
    micrometers or calipers, in some cases gage pins are used. The keypad would be a
    convenient way to capture the results. Machine operators would press one key for
    a good component, another for undersize, and another for oversize.
    I would greatly appreciate any leads.

    Thank You,
    Paul Hossfield
    Mahr/Federal Products Co.
    1144 Eddy St.
    Providence, RI 02940
    Phone: 401-784-3270
    Fax: 401-784-3461


    I keep hitting "Esc", but I'm still here!
     
  2. | I have been looking for simple low cost Keypads w/RS-232 output. What are some
    | good manufacturers? Looking on the Web I keep ending up at Amazon or Ebay, but I
    | want to call up (someone who knows the product) before buying. I need to have at
    | least 3 keys but more, say digits 0-9, would not hurt. Needs to have 9 pin
    | serial output. (Or 24 but pref. 9. Or I could use an adapter it it came with a
    | USB connector.)

    Easy, get hold of an old redundant PC with a keyboard and a serial
    port. A DOS boot floppy disk, with the one single line command in the
    Autoexec.BAT to redirect output from the keyboard straight out to the
    serial port. It doesn't have to have a hard disk, nor screen once set
    up. Just a floppy disk set up as a boot disk.

    --
    Regards,
    Harry (M1BYT)...

    Remove the 'NOSPAM' in my email address to reply.

    Free Amateur Radio Courses:-
    http://www.ukradioamateur.org
     
  3. Mjolinor

    Mjolinor Guest

    Hmm, if memory serves then it will need more than two lines, you will have
    to set the time otherwise the command prompt won't appear and load the
    correct keyboard file probably. That is going back a few years :)
     
  4. plh

    plh Guest

    I thank you all for your help, but I am not looking to hot-rod something. I
    thought perhaps there was a supplier out there with such a device, or reasonably
    close. Something the size of a computer keyboard would be clumsy in service.
    Calculator size would be OK.
    Thank You,
    Paul H.

    I keep hitting "Esc", but I'm still here!
     
  5. Mjolinor

    Mjolinor Guest

    There is an RS232 keyboard available, several of them in fact. The ones I
    have used have a PCB about 50mm X 30mm and use a PIC, they have 0-9 keypads
    on and cost about £8 last time I bought one. I have no sources for them now.
     
  6. plh

    plh Guest

    Thanks. I did find something that is not altogether unreasonable.
    -plh
    I keep hitting "Esc", but I'm still here!
     
  7. Paul,

    If you need only three switches, get an old 3-knobs serial mouse.

    pieter
     
  8. Paul,

    If you need only three switches, get an old 3-knobs serial mouse.

    pieter
     
  9. Maxine in RI

    Maxine in RI Guest

    |
    |"plh" <> schreef in bericht
    ||
    |Paul,
    |
    |If you need only three switches, get an old 3-knobs serial mouse.
    |
    |pieter
    |
    Thank You! (Why didn't I think of that?)
    -plh
     
  10. plh

    plh Guest

    I tried it but the problem is that, even with the ball removed, it generates
    output when tilted this way and that, so it would not work for my application.

    I keep hitting "Esc", but I'm still here!
     
  11. | >
    | >Paul,
    | >
    | >If you need only three switches, get an old 3-knobs serial mouse.
    | >
    | >pieter
    |
    | I tried it but the problem is that, even with the ball removed, it generates
    | output when tilted this way and that, so it would not work for my application.
    |
    |

    In that case, jam the internal rollers with a bit of 'Blue Tack' or
    similar. You could perhaps alternatively remove the rollers completely,
    they just clip into to place.
    --
    Regards,
    Harry (M1BYT)...

    Remove the 'NOSPAM' in my email address to reply.

    Free Amateur Radio Courses:-
    http://www.ukradioamateur.org
     
  12. Paul,

    Guess you have to fix the (optical) movement sensors using beewax,
    nailpolish or some other glue. You can also try to make a shortcut or remove
    them totaly. Should be possible to make them quiet.

    pieter
     
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