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IR adapter hack

Discussion in 'Electronic Components' started by Jim, Apr 10, 2007.

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  1. Jim

    Jim Guest

    I would like some help in hacking an IR printer adapter made for the HP 350c
    printer. This is a tiny pc board with a minimum of components connected via
    8 wires to a parallel printer connector. I would like to put this to use as
    a serial port to IRDA device if possible. Yes, I know there are probably
    simpler ways, but this is a very tiny board, and I'd like to learn from it
    anyway.

    This board is different from others I have torn into. It has an IRDA
    transmitter/receiver encoder/decoder similar to but a bit smaller than the
    HSDL7001 but only has the numbers R800 and 016A on the back. This is a
    through hole, 9 staggered pin device. This adapter was sold by HP so is
    this R800 an HP part? Wish I had a data sheet!

    In addition there is a small crystal with the frequency 3.68 mhz but no
    processor......but does have 3 transistors, 2 resistors, and 2 capacitors
    (all surface mount). I think this is the frequency specified for 16xclk.

    On the connector side, the only used pins are:

    18 +5v
    19 gnd
    10 low-ack
    1 low data strobe
    13 high
    12 high-paper end
    19 gnd

    19-31-36 (low) (gnd) are all conncted
    11-16 connected (gnd)

    The presence of the crystal leads me to believe that the baud rate is taken
    care of already, on-board. So how do I go about finding where the rx and tx
    connections should be. Or is this even possible? The circuit is obviosly
    getting it's power (5v) from the printer.

    Thanks
    Jim
     
  2. Franc Zabkar

    Franc Zabkar Guest

    These are the OP's photos of the subject PCB:
    http://www.users.on.net/~fzabkar/IR/

    - Franc Zabkar
     
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