In TestStand, how can a main sequence be executed while sending RS-232 messages at a fixed periodic rate (e.g. every 500 msec, independent of the steps executing in the main sequence)?

I am trying to send periodic RS-232 messages (through a DLL function) while a sequence is executing. Does TestStand have periodic timers that can be used to perform periodic tasks independent of other sequences executing?
Thanks,
John Merritt

John -
In TestStand 2.x, you could have a root sequence launch a subsequence in a new thread. The root sequence call could auto wait for the thread.
1) The new thread could have a loop structure that contains a label, action, wait and goto step. The action step could send the message.
or
2) You could also have a single step loop internally to periodically send the messages, but the step should monitor the execution status for termination, and the step should process messages while waiting inside the step.
Hope this helps...
Scott Richardson NI
Scott Richardson
National Instruments

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In TestStand, how can a main sequence be executed while sending RS-232 messages at a fixed periodic rate (e.g. every 500 msec, independent of the steps executing in the main sequence)?

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