NI9401 and linear encoder

[xavier7442]

Hi,

We use NI-9401 module on cDAQ-9189 device in slot 5 to measure a linear encoder (Heidenhain).

I used the drawing design specified there : https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000x1riCAA&l=en-US

Under NIMAX, I have created a virtual channel to measure a linear position.

Then I have created a counter task for linear position (with call to my virtual channel).

If I set up my task with option one sample on request, it is working, but it will not be very efficient with Labwindows/cvi because it creats interrup.

I am not able to use continuous samples option ! : internal clock is dimmed and the other clock choises don't work.

Have you got an idea how to set up my task ?

Thank's

[Kevin_Price]

I'm less sure about cDAQ, but on many other DAQ devices, counters can't derive their own sample clocks internally.  They need to borrow one from elsewhere.   For example, you could use a 2nd counter to generate a pulse train that your encoder counter uses as the sample clock.

-Kevin P