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Reading digital In from 6601

I have the PCI-6601 installed in my computer. I can see the card in Automation Explorer. I can also use the digital out through one of the counter. However, I cannot use the digital in to read a digital TTL signal through one of the ports. The VI I used to read the file is shown in the picture, and I am getting an error:
Error 10100 - occured at DIO Port config. The requested digital port width is not a multiple of the hardware port width or is not attainable  by the DAQ hardware. I have tried several port widths with no success.
 
I would greatly appreciate your help.
 
David
 
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Hi David,

Have you tried the troubleshooting steps in this Knowledge Base article?

Please let me know if this helps.
Abhinav T.
Applications Engineering
National Instruments India

LabVIEW Introduction Course - Six Hours
Getting Started with NI-DAQmx
Measurement Fundamentals
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