Asynchronous serial read methods

[camerond]

I'm still a little hesitant about events in LabVIEW using data coming in (not user events, mouse click, keyboard, etc.). When I'm looking for an async serial stream to start coming in, I currently use the upper loop in the attached VI (38.4 KB, hex string in, the "stop loop control" is actually set from the serial bytes coming in - a 2-byte terminator) and it works fine, getting the whole string I need. It's polling the port every 1 ms until something comes in.

Would the lower loop give me the same functionality without doing this continuous polling, or would it actually do something different? If I were to use this one instead, am I blocked from writing to the same port in another part of the code until I get some data in and the while loop stops, or is there some way to barge in and then start looking for data again?

Cameron

[RavensFan]

You can write to the same serial port in other parts of your code.

I have never used serial events before, so I don't know if there are any oddities to it.

In both examples, I would use the bytes at port to read all the bytes at the port that are available at that moment and concatenate them to the string rather than just one.

[camerond]

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@RavensFan wrote:

In both examples, I would use the bytes at port to read all the bytes at the port that are available at that moment and concatenate them to the string rather than just one.

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I'm only reading one byte at a time because of the way I have to determine the stop situation (because of dealing with other, older, inherited code), although, looking at that part of the code, I might be able to remove that here and do single-byte checking down the line. I know it slows me up a bit, sl I'll check that out.

Cameron

(Steelers Fan)