USB-6001 - How to select PFI1 as counter source

[ynnadetoc]

Hi,

I am using USB-6001 device and I need to know how to select PFI1 instead PFI0 (Default) as counter source in Python.

I know that device is supporting it since I can use PFI1 through NI MAX Test panel

Thanks

Danny

[WaiLee]

Hi, this is the available source for NI DAQmx example program:

https://github.com/ni/nidaqmx-python/tree/master/nidaqmx_examples

And this is the link to refer for the definition of the function:

https://github.com/ni/nidaqmx-python/tree/master/nidaqmx/_task_modules

If you need full guidance on how to control NI DAQ device with Python and NI DAQmx: 

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019Pf1SAE&l=en-MY

[ynnadetoc · Accepted solution]

Thanks for the link, I found the way to do it, there is working code:

import nidaqmx
import nidaqmx.constants
import time


PPS_OUT_NI_INPUT = "/ctr0"
PPS_IN_NI_OUTPUT = {'J3': "/ao0", 'J13': "/ao1"}
PPS_FREQ = 1
PPS_DURATION = 5

input('Connect signal to PFI0 and press enter')
task_input = nidaqmx.Task()
task_input.ci_channels.add_ci_count_edges_chan('Dev3/ctr0', 'tata').ci_count_edges_term = 'PFI0'

task_input.start()
count_start = task_input.read()
time.sleep(2)
count_stop = task_input.read()
count = count_stop - count_start
task_input.stop()
task_input.close()
print('Count on PFI0 is [' + str(count) + ']')

input('Connect signal to PFI1 and press enter')
task_input = nidaqmx.Task()
task_input.ci_channels.add_ci_count_edges_chan('Dev3/ctr0', 'tata').ci_count_edges_term = 'PFI1'

task_input.start()
count_start = task_input.read()
time.sleep(4)
count_stop = task_input.read()
count = count_stop - count_start
task_input.stop()
task_input.close()
print('Count on PFI1 is [' + str(count) + ']')