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GPIB: 24-pin Centronix connectors?

Discussion in 'Electronic Components' started by Joerg, Dec 22, 2008.

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  1. Joerg

    Joerg Guest

  2. neon


    Oct 21, 2006
    Those cnectors were standard for all DOS printers and there were 26 pins not 24 if I REMENBER CORRECTLY. theree 2 latches on the connetor to keep the cable there.
  3. Hi Joerg,
    Use ours, it is more compact than Prologix's ;+) :
    If you're definitely looking only for GPIB connectors then just have a look
    at L-COM, they sell GPIB connectors.
  4. P.

    P. Guest


    Your product is interesting. Especially the emulation software.

    Does that software only work with your product? Or also with a NI
    USB-GPIB? Is it possible to set up a HP35665A or a HP 3562A lf
    spectrum analyser so it can plot directly to the computer? Those
    devices already know the plotrter language. Does the PC emulate a
    plotter and save it as jpg/bmp?

  5. P.

    P. Guest

    Forgot to ask one more thing: can those plotter tools run at the same
    time my application (Delphi, I rewrote to oldfashioned and badly
    documented NI library to an object-oriented one) is running? Or will
    things get mixed up?

  6. Hello P,
    As other USB/GPIB products, the smart488 is basically emulating a serial
    port on the PC side, although there isn't any actual serial port anywhere.
    In its basic mode, meaning with only one GPIB equipment connected, it allows
    a fully transparent dialog between the PC (bus controller) and the equipment
    (talker/listener). Anytime you send something to the virtual serial port the
    interface will switch the equipement to listener and send it the data, then
    will switch it back to talker and will transfer to your application through
    the virtual serial port any data sent by the equipment. A command mode
    allows to manage more than one slave. It was of course not tested with all
    GPIB devices on earth but work well with old HP devices (8569, 8563, 3585,
    ....), Lecroy scopes, etc. On the PC side it was tested with KE5FX's plotter
    emulator (in device initiated mode) as well as with HP's Benchlink software.
    It also works with any langage able to talk to a serial port (VB, VC++,
    Python, Labview, etc), but is not compatible with NI libraries. Of course
    only one application at a time can preempt the serial port and use the
    interface. See FAQ here
  7. Joerg

    Joerg Guest

    The link times out right now. Anyhow, I already bought it since it seems
    to be the only one available in the US.

    Thanks, I'll check that out.

    Joyeux Noel, Joerg

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
  8. Joerg

    Joerg Guest

    Thanks, Mike. I'll have to get solder cup versions though.
  9. Joerg

    Joerg Guest

    If you have an FTDI chip in there the DLL for that also supports direct
    access via USB, without serial port emulation. Still, I would never give
    up the COM emulation because nothing is simple and easier than to talk
    to a device via a terminal program.
  10. No we don't use FTDI, the smart488 is a monochip PIC-based device. A virtual
    serial port profile is used for convenience, but there isn'"t any serial
    port inside...
    Agreed !

  11. Guest

    I don't see a US distributor.
  12. JW

    JW Guest

    I know exactly what you mean - mine has the same problem. How about
    something like this?:
  13. No specific driver is needed, it is working with the generic usbser driver.
    An .inf file is only required under Windows for plug&play detection as
    Yes, no problem, no need for driver or config files at all. Linux is more
    plug&play than Windows when talking about virtual serial ports ;+)

  14. P.

    P. Guest

    I am now using a NI USB-GPIB. And am using Delphi to control it.
    Is your device acessible in the same way?

    I have worked on embedded SDLC communication devices, with manuals,
    communication doc and especially well defined OSI layers. That last
    point, OSI layers, is something I really miss with the NI software.
    You can jump everywhere and do all kinds of calls on all levels, but
    there is no real description what you should build. It can only be
    found by looking through examples. And I even found an error in the
    original NI Delphi (probably present in the C version as well)
    software that will make one call not work correctly, giving stack and
    heap problems. I fixed it, and the call now works.

    How must your device be programmed? Look like the NI. Or must we build
    things ourselves?

    And is there somwhere a decent manual on a "GPIB how to"?

  15. You can control a device like the smart488 interface from Delphi, but NOT
    through NI USB-GPIB libraries. You will just need to use the serial port
    access routines provided by Delphi. In transparent mode (only one equipment
    connected) you will directly talk to your instrument. If you need more
    complex features then you will use a Hayes-compatible standard protocol
    (+++, AT+ADDR=12, ATO, etc), see manual.

  16. Joerg

    Joerg Guest

    That would make it even worse, by about 1" in extra length. I just want
    to solder cable onto a solder-cupped 24-pin Centronix and come out
    sideways, then 3-4ft to some location where the Prologix can comfortably

    I wonder if the twists in CAT5 would mess up the signals when using each
    pair for two data lines. We'll see. After all, GPIB is really slow.
  17. Joerg

    Joerg Guest

    Yes, but right now the back feet of the analyzers act as buffers and the
    Prologix screws stick out and can scratch the wall paint. Not that I
    would care but I am married, so ...

    I'd have to take this all apart, pretty big job. Then again my wife is
    pushing me harder and harder to get new flooring into the lab. So far I
    haven't succeeded in finding a local source of decent carpet tiles. Then
    I'd have to take out everything anyhow (if I find tiles).

    Yes, I think so, too.
  18. Joerg

    Joerg Guest

    It's hard to shield that. Also, I want to use up some of the remnants
    from the LAN installation ;-)
  19. P.

    P. Guest

    So that is totally different. I have two precison current sources,
    voltsage sources, 2 precision multimeter and apower supply on GPIB.

    So a lot of work to program this. In NI, as I made softwareobjects for
    the devices, it is easy.

  20. Mark Zenier

    Mark Zenier Guest

    Digging out my copy of IEEE Std 488-1978, the answer appears to be yes.
    As a footnote, it calls out Amphenol (or Cinch) "Series 57 Microribbon"
    or AMP "CHAMP". (An Allied or Newark catalog would give a good overview
    of that old stuff).

    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
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