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FE33L serial output to RS-232

Discussion in 'Electronic Basics' started by Mark McGee, Sep 30, 2004.

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  1. Mark McGee

    Mark McGee Guest


    Does anybody have experience of the Maplin (FE33L) temperature control

    It has a 13-bit serial output (it's a custom BCD type of thing). I'd
    like to convert this 13-bit data in to RS-232 that I can plug in to a
    PC serial port and poll with software.

    the module has a data pin (0v-1.5v) and a dataclock(0v-1.5v) which
    pulses on for 0.125 ms, and holds for 1ms for each of the 13-bits.

    I assume I'll need to connect this to some kind of shift register
    (16-bit), but I'm not sure if I can then throw this 16-bit register as
    some IC which'll send it via RS-232 for me.

    Any ideas?
  2. An RS232 PC COM port accepts datawords up to eight bits. So you have to read
    out the MAPLIN module, split up the data and then feed it to the PC. I'm
    sure it *can* be done using logic building blocks but you will end up with a
    pretty large and expensive board full of electronics. The way to do this
    type of conversion is using a microcontroller these days. You will need two
    transistors to amplify the 1.5V pulse to 5V. The micro for the protocol
    conversion and a MAX232 or similar to convert the 5V output pulses of the
    micro to the RS232 levels required. As for the micro you have a lot of
    choices. If you want a quick and easy result, take one with a build in UART.
    If you have to make hundreds or more, take the cheapest micro you can find.
    The programming is the hardest thing of course but make no mistake, building
    the same thing in nonprogrammable logic reliably is much harder.

    petrus bitbyter
  3. Guest

    Thanks for the advice. I found this resource and
    there's sample code for RS232.

    I only have to make 1 or two of them, and maplin suppy the PIC 16F628
    for £2.99

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