Labview 9 with GPIB-RS232 for controlling shutter at fixed interval of time

Hello,
I want to control my shutter using LabView. I have got a program for it from which I can see that shutter is being controlled. But I don't know how should i incorporate this conditional opening and closing of shutter. For example, I would like shutter to be close for first "t1' sec and open for next "t2" sec and again close for "t1" and this repeated over unless stopped.
I am attaching the file also, Can somebody explain me how I can do it?
Thanks and regards.
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I'm thinking this would be a good application for a State Machine.
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Labview 9 with GPIB-RS232 for controlling shutter at fixed interval of time

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