Asynchronous serial com with DAQ6034E

Hello,
I am a new CVI programmer, and i would like to submit a problem.
I use a DAQ6034E card with LabWindows/CVI. I would like to communicate with devices via an asynchronous serial bus. Is it possible to do such a thing with a digital I/O, and how can I do (especially for reception) ?
Thank's for your help !
Franck...

Frank,
You could use the DIO lines on the 6034E. But keep in mind the limitations of the DIO lines on this card. These DIO lines are programmed IO only. That means, that data transfers (in or out) can only be done via software timing. You cannot do any hardware timing on the DIO lines for this card. If you need hardware timing on this operation, you will need to use a DIO card.
But, if you can work with only software timing, you have the advatage in this card of being able to configure line direction on a line by line basis, which I think can be very beneficial in serial communication.
Nick W.

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The prior version of my code had the packet being read in 10-bit [1 byte] chunks, processing, then reading the next chunk. I encountered exactly the same error. I assumed that having too much code in the sampling process was causing the timing to be thrown off, so I changed it to read off the entire packet into a bit array and then process it afterward [while no data is coming in]. I've attached this version of the code for reference. It's cleaner, but no change as far as the error is concerned.
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Attachments:
IMU_serial_in.vi ‏61 KB

Hi Ryan,
I have a suggested methodology, but I don't currently have any example code to share that would get you started.
The challenge you have is even if you sample at the exact right baud rate of your incoming signal, the phase of the FPGA clock will not be exactly the same as the source signal. Now complicate that with your sample frequency and baud rate will always be slightly different, and you will get the sampling drift effect you described where data eventually is clocked in wrong. On short transmissions, this may not be a problem because the sampling can be re-aligned with a start bit, but for long, continuous streaming, it eventually fails as the sampling and source signals drift out of phase.
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Asynchronous serial com with DAQ6034E

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