16F877A won't keep relay on 100% of the time

[coyotegd]

I'll remember that and keep "CMCON = 7" with "ADCON1 = 7" when switching from analog to digital I/O. However, this did not solve my problem either.

I now know that it's the 12kHz from Mach3. Although I can't see it on the oscilloscope, the signal has a hiccup. I can hear it on my digital probe, and the probe's ever so slightly audible hiccup matches the relay's. Even the hi-low lights dim very slightly now and then.

So off to Mach3 support for information on how to obtain a clean 12kHz from their software.

As soon as their signal measured at 12 to 12.1kHz when they stated it would be 12.5kHz, I should have looked more closely at the signal.