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Thread: Matrix Orbital Com Port Problem

  1. #1
    FLAC PatO's Avatar
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    Angry Matrix Orbital Com Port Problem

    I've had a Matrix Orbital 40x4 LCD for over a year now and boy, does it work great! 'Been through 1-1/2 cold Minnesota winters, even.

    The other day, I was redoing my software and kicked up the serial port baud rate to support some fast graphics on the display. Everything I've seen since is garbled text...
    (few days out of warranty, no less)

    To add to the frustration, my display just happened to be the one model that didn't include a #$*(% hardware reset jumper! At least, I haven't found it yet in any manual.

    Anyone have any ideas? I'm thinking a big magnet might do the trick! He He, Anyone want to buy an LCD? I'll give you a good deal...

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  2. #2
    Retired Admin Aaron Cake's Avatar
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    Cool

    Several things might erase it. Try at your own risk. I doubt a magnet will have any effect. There may be a small battery that can be removed for a few minutes. There also might be a large value capacitor (several Farads!) that can be shorted (through a resistor) for a while to reset the circuit. Static electricity may work, but will probably damage other parts of the circuit. You might just want to contact the manufacturer as there is probably a very simple way to do this.

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  3. #3
    Variable Bitrate
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    Post

    A magnet won't work since the LCD most likely uses flash memory for storage. And NEVER assume static electricity will do anything to your electronics other than fry them and render them useless. Always make sure you are grounded when you work with electronic devices. Static electricity is just about the worst thing you can do to your LCD.

    Contact Matrix Orbital -- I'm sure they have a reset procedure you can use to get your LCD back to normal.


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  4. #4
    Constant Bitrate
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    Ouch .. yup, static will do it for you .. but you wont likely be able to re-set any values simply because the micro. will be fried!

    What is the part number for the controller chip? Often you can re-set them by supplying Vcc to a RST pin.
    -James-

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  5. #5
    FLAC PatO's Avatar
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    There is a GPO (general purpose output) jumper that is evidently supposed to reset the baud rate, but it doesn't seem to do anything. (I heard that from the place I bought it from)

    I've sent several E-mails to Matrix and haven't received a reply yet.

    The controller is a PIC16C67. I've been looking around for some sort of way to clear its memory, but haven't found anything yet. Seems fairly common, anyone have an idea?
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  6. #6
    FLAC PatO's Avatar
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    Well I'll be darned.
    I just happened to wander across a place that sells these displays. They had a PDF manual from Matrix that out of the blue, said to connect jumpers 5 & 6 of the keypad input!

    Boy, talk about messed up documentation!

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