Hello,
I don´t know where to start from here, because the index is mapped properly from digispeed to Input4 on modIO and it blinks friendly. The input is mapped under Inputs ->
Index to Port 0 and pin 4, BUT mach3 shows a rpm between 25 and 39 and it is going up and down.

I figured that it is necessary to readout the rpm register 1057, but where to setup such a readout, or map the readout to rpm DRO.

all the best
seth