System: PXIe-6555 card with LabVIEW 2015 (non rt/fpga)
Setup
- 4 DIO channels set up as DYNAMIC - used for SPI. All communication is done via preloaded waveforms.
- All other channels are set up as STATIC.
Problem:
- right before dynamic waveforms are generated, all STATIC channels that are set to HIGH Z Mode get pulled down (driven low) momentarily
- only channels that are set to HIGH Z are affected. The channels that are driven (high or low) remain in their current states.
Not having much luck finding the cause. I have tried using Initial State and Idle State VIs to specifically have each channel retain its current state but no luck. The preloaded waveforms only have data for the 3 DYNAMIC output channels (the 4th Dynamic channel is read only). I'm wondering if maybe HIGH Z mode does not count as a valid state. If anyone have any suggestions, let me know.
Thanks!