Externally Control Count Direction with 6501

[Randon Rose]

I have a USB-6501 Digital I/O & Counter card. I have an encoder that outputs a 50% duty cycle digital squarewave for a count, aswell as a digital high, low to indecate the count direction. Under the DAQmx configureation panel there is an option to have a externally controlled count direction. When selected I get an error saying:

Error - 2000777 occurred at DAQ Assistant

Possible Reason(s):

Measurements: Requested value is not a
supported value for this property.

Property: CI.CountEdges.Dir
You Have Requested: Externally Controlled
You Can Select: Count Up

Channel Name: CountEdges

To me this sounds like my USB-6501 does not support this function. If this is ture is there a way I could perform the same task in code? If not what hardware could perform this?

Thanks,

Randon Rose

[Chris_W.]

Hello,

You are correct that your device does not support that functionality. The USB-6501 counter is only usable as an event counter, which means it can only count falling edges of an incoming signal. This counter is usable on only one external terminal, also port 2 line 7.

If you would like to know what you can do with this device check out this link, which is the manual.

Chris W