Bkaspar,
Without having a data sheet for a particular SSI Encoder to look at, it seems like this should be possible with your USB-6341. However, I think it you'll need to use a combination of counter output and digital input to do what you want. What sensor are you trying to interface with?
In general, it seems like a procedure like the following would work:
1) Create a counter output task with the following settings:
- Rate = 90,000
- Duty Cycle = 50%
- Idle State = start state of active edge of SSI clock (ie.. If active high, idle state should be low)
- Continuous Samples
2) Commit this task - this will set the output line to it's initial state
3) Create timed digital input task with following settings:
- Line (pick a port 0 line)
- Sample Clock Source - Counter task's output
- Sample Clock Active Edge - idle edge of SSI clock
- Continuous Samples
- Start Trigger - Digital Edge sourced by counter output task, active edge idle edge of SSI clock
4) Start digital task
5) Start Counter Task
6) Read Data in multiples of 25
7) Process each chunk of 25 samples into a single encoder reading.
In general, I think that it would look something like the VI I have attached (assuming that you're using port0/line0 as a digital line, and the SSI clock is rising edge active. I don't have anything to test this with so I wouldn't necessarily expect it to work, but hopefully it'll lead you in the right direction.
Dan
