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 | | From: | E.Lee | | Subject: | Re: waveform chart clears randomly | | Date: | Wed, 19 Jan 2005 17:10:54 -0600 (CST) |
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 | Hello Dennis,
I'm glad to hear the chart does not reset anymore :)r>
In regards to the drifting timestamps... One thing you could do is oc=
casionally update the timestamp for the serial data. If the serial data is=
lagging behind the data acquisition, just grab another timestamp using the=
Get Date\Time in Seconds VI. If the serial data is ahead of the data acqu=
isition, then it is a little trickier. We would have to decide what the fi=
nal timestamp on the data should be, how many samples of data we want to pl=
ace back on the chart, and then calculate what t0 is based on the previous =
information (we would also have to save the chart history in the while loop=
However, if you are also artificially creating the timestamps for the da=
ta acquisition, we can just update the data acquisition timestamp if the se=
rial data is outpacing the data acquisition. But like you said, it is ulti=
mately up to the end user.
I hope everything turns out well!
=
E.Lee
Applications Engineer
National Instruments
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