How to read back the output state for digital output or anlog output ?

I use NI-pci 6221(68PIN) Accquistion card to do measurmet,after i do digital output ,or anlog output ,I find that the output will be maitained by the card.even after i exit my accquistion program.But if i reset the card ,the ouptut also will be reset.
Now if i don't reset the card ,how can i read back the output state,?

Hi Mike,
There is no way for you to internally route an analog output to an analog input. The only solution is to physically connect the two lines together with a wire.
I came to this conclusion through the following steps:
1- Start MAX and select the DAQmx device under "Devices and Interfaces>>NI-DAQmx Devices" that you want to internally route signals through.
2- Click on the "Device Routes" tab on the bottom of the right hand window (It defaults to the "Attributes" tab)
3- Line up the Source with the Destination to see if the connection can be internally routed (either direct or indirect)
I came to the above conclusion by following these steps for a PCI-6251 DAQ device (the analog output & input do not exist in the "Device Routes" tab therefore they do not support internal routing), but you should verify this for your specific hardware. Let me know if you have any other questions/concerns.
Cheers,
Jonah Paul
Applications Engineer
National Instruments
Jonah Paul
Marketing Manager, Embedded Software
Evaluate the LabVIEW RIO Platform! - ni.com/rioeval

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How to read back the output state for digital output or anlog output ?

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