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Infrared adapter hack

Discussion in 'Beginner Electronics' 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.

    (Incidently, there is a similar adapter for the HP 450c that uses a HSDL
    1000 encode/decode, NO crystal or processor, only a couple transistors and a
    few passives, but uses only 5 wires from the printer port connector.)
    curious!

    Thanks
    Jim
     
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