Wait until true in a sequence structure

[Plasmaticon]

I am communicating to a serial device using RS-232. I have a set of sequenced commands being sent to the device and I need to have the sequence wait until I receive specific strings from the device. Is there a simple way to have the sequence wait until I receive those commands? The problem is that it may take several seconds for the hardware to execute the command and I do not want to continue the commands until it completes the previous steps.

Nick

[Dennis_Knutson]

You just have to put your instrument read inside a while loop. Terminate the while loop when the correct data is read or when a timeout value is reached (an error condition). Instead of a sequence structure, you'd probably be better off using a state machine architecture. There's a couple of shipping examples that shows this architecture. Much more flexible that a sequence structure.