I use the PCI 6534 for pattern generation with external clock, using on-board memory. I set up in Labview with DIO config...DIO param(set pattern generation loop enable)...DIO write...DIO trigger config(start on external)...DIO start(pattern generation with external clock). My external hardware depends on the number of times the buffer has been output, and was not responding as expected. So I checked the buffer iteration count with DIO Buffer write(no input, read buffer iterations output). It turns out that immediately after executing DIO start, the buffer goes through seven iterations even though there is no activity on the clock input. Even stranger, I have set up to start the buffer on an external trigger, and that external trigger hasn't occured yet either. Besides these first seven buffer iterations, the results are as expected. The clock signal doesn't cause any more change of output until the external trigger happens, and once the trigger occurs, the output cycles through the buffer one point per clock cycle. How can I stop these spurious buffer iterations, so I get my first data point at my first clock cycle? Thanks, Karl.

Digital I/O

PCI 6534 goes through 7 buffer iterations before receiving any clock

Hi Karl,

Great to hear that it's back in working shape. If you notice the same behavior again, then post back, so that we can try to investigate a bit further.

Regards,

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Digital I/O

PCI 6534 goes through 7 buffer iterations before receiving any clock

Re: PCI 6534 goes through 7 buffer iterations before receiving any clock