MCC USB-200 Series: Single Gain Multifunction USB DAQ Devices

[Bob Plotke]

I have a MCC-USB 201.  I have a precision 250 millisecond read signal that I have wired into the AICKI line with grounding.  I used LabVIEW's Digital input example, Digital Read port with Ext Ck.VI (reading for logic TTL lines.  When I configure the timing parameters to "external clock" and "sample clock" and press RUN, I get error #10015 Paced operation is not supported for the specified task. Use No Clock mode.  When I use the No clock mode, I can acquire data but the loop rate for multiple continuous sampling is extremely fast.  I need the MCC-USB 201 to control the sample rate to the 250 milliseconds in a continuous mode. 

Bob Plotke 

bobplotke05@gmail.com 

  

Digial Read Port with Ext Ck.vi

[JRys]

Only the analog inputs can use the ACLKI input. The digital port is read using a polling technique (loop). To control the loop timing, use LabVIEW's Wait until next ms multiple VI found on the Timing pallet. Review the ULx Read Dig Chan.vi example found in \LabVIEW 2023\Examples\ULx\Digital\Read Values.llb. 

 

[Bob Plotke]

Hello JRys, 

Are you trying to tell me here is no way to sample a digital signal input with precision using my 250 millisecond read clock? 

Bob Plotke 

[JRys]

Correct, reading the digital port is an asynchronous operation.