Linuxcnc - parallel port vs mesa card

Thanks,

So Mesa card will calculates the pulses itself and the reports value of position (or speed? ) to Linuxcnc - not the individual pulses?

Karri

Yes

I asked Peter when I was adding an encoder to my BP knee mill and he said the encoder input can count up to 1MHz or 1,000,000 cycles per second. So if you have a 2500 ppr encoder you can spin it at 12,000 RPM. Pretty impressive I'd say.

Edit: this was for my 7i77 card.

JT

Yeah the maximum encoder count rate for the Mesa cards depends on a number of variables

1. ClockLow rate (33 MHz to 100 MHz depending on card)
2. Muxed on Non-muxed, muxed encoders top out at a couple MHz Max, non muxed up to about 10 MHz
3. Digital filtering settings (settable to 3 or 15 sample clocks, sample clock can be up to 8 MHz on mulltiplexed
encoders and up to ClockLow on non Muxed counters.)