the serial communciation receives wrong data

[crossrulz]

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PKIM wrote:

The source of data is generated by external circuit board which is running at BAUP 9600. The board will send out a text  contains 30 to 70 characters at every 1 second. The above labview code is working perfectly.

But if I let the circuit board generate the same data but in the interval of 10 seconds or longer, the labview code works for a while but after it always receive somehting weird, the indicator shows blank string. I am thinking if it is because the code try to read out something but the source is not yet ready to produce any?

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The default timeout is 10 seconds.  If your code was working with data coming out every 1 second, but now does not with every 10+ seconds, all you need to do is increase your timeout (one of the inputs on the Configure Serial Port).