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  1. May 29th, 2011, 07:17 AM #1
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    gullab2@yahoo.com is offline Junior Member
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    Question Serial Port Interfacing

    Hi every one!
    Actually i want to drive a LED Display.

    I want to send data through serial port COM1. I develop my application using VB 6.0 but there is a
    problem and that is, when ever i try to send data to COM1, the VB also sends a lot of some synchronization bits or may some thing else. Therefore the display module displays some garbage.
    I want the solution, can somebody help me in this regards. please....

    Thnx in advance!
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  2. May 29th, 2011, 08:41 AM #2
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    GremlinSA
    GremlinSA is offline Elite Member
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    Re: Serial Port Interfacing

    Okay so how are you opening the Com Port?? what type of LED Display is it? post the offending code so we can debug it for you..
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  3. May 29th, 2011, 09:12 AM #3
    DataMiser
    DataMiser is offline Elite Member Power Poster
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    Re: Serial Port Interfacing

    If you are seeing garbage it is likely that your port settings are incorrect. Baud rate. Parity, data bits and stop bits must match on both sides, VB adds nothing to a com string. You should receive exactly what you send if your settings match. Otherwise the receiver will be unable to decode the tranmission and will result in garbage.

    In other words if your LED panel is set for 9600, n, 8,1 then your comm control must also be set to 9600, n,8,1
    Last edited by DataMiser; May 29th, 2011 at 09:14 AM.
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  4. May 30th, 2011, 03:36 PM #4
    ibyk30
    ibyk30 is offline Junior Member
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    Re: Serial Port Interfacing

    DataMiser is 100% correct.
    before you write any program in VB, use null modem to connect two serial ports (can be on different PCs if you like) and configure ports (use hyperterminal or whatever you use). you will quickly see that you only get correct signal if baud rate, parity, etc. all match.
    note, unless you have fully wired cable, do not select hardware handshaking.
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