Hi,

I was using one of the inputs to read my E-STOP button which shorts to 
ground when triggered, but I kept on getting false positives.  I looked 
at the input pin in halscope and saw a square wave that goes high for 
2ms then low for 2ms and repeats.  I removed the E-Stop button and 
everything else connected to the IO of the 7i43 so it is just the 
parallel port and the usb cable powering the 7i43 connected.  Looked in 
halscope again, and the square wave is still there with nothing 
connected.  Checked several other unassigned pins and they also show the 
square wave.  Anyone have any ideas on what is happening?

Thanks!

Lawrence

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