Trigger counter using the output from another counter

[PaulieQ]

Hi,

I want to configure my USB-6221 Board in the following mode

1. Counter0: Generates pulses in continuous mode.

2. Counter1: Is triggered by the Counter0 Pulse (rising edge) and generates a train of 128 impulses with a certain frequency.

3. DigitalInput: Using the pulses generated by the Counter read 128 values from Digital Input

Cnt0: _____|______________|______________|______________|_________

Cnt1: ______||||||||||||_________||||||||||||_________||||||||||||__________||||||||||||___

DigIn:______xxxxx_________xxxxx__________xxxxx_________xxxxx____

The problem is: I don't manage to trigger the Cnt1 using the output from Cnt0.

If I connect using the Cnt0InternalOutput: I get the error: this connection is not supported by the board

If I connect the Trigger to a PFI(e.g. PFI5) I get the error: that some resource from Cnt0 is used (I don't see any reason why by ok).

I've been trying for a while to make in in different way (I've completely mixed up my vi) but I didn't manage.

If someone has some suggestion please shear them.

Thanks,

Paul

[PaulieQ · Accepted solution]

Ignore my previous post.

One mistake is that Sample Clock: Finite Sample doesn't seem to work with trigger in this configuration.

Anyhow I found a way to work around and to achieve my final goal (the purpose of the test) with a complete other counters and digital input configuration.

[Christian Mergl]

Hi,

Since your question seemed to be answered please mark your own post as answer.

Thanks,

Christian

[bef]

Would you mind sharing your solution? I just ran into the same problem.

Thanks a lot!

Bef 

[Kevin_Price]

What I'd try first is to use Counter 1 as a Pause Trigger for Counter 2, and then set Counter 1's

pulse width to be 128 periods of Counter 2.  That oughta work for an M-series.

-Kevin P

[bef]

Thanks!

I figured that out as well. The tricky part was finding the "Ctr1InternalOutput" - channel that has to be connected to the pause-trigger-input. (right-click on the constant - name filtering - show advanced)

[PaulieQ]

Hi Bef,

I don't remember exactly which was that solution.

After several days I didn't use the NI board anymore for that project. What I needed was to complex for an Acquisition board so I did everything using a FPGA.

Sorry for not being able to help you more.

Regards,

Paul