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Standard 7I96S firmware has 4 built in MPG quadrature counters
overlaid on the first 8 isolated inputs. This means you do not need
to decode individual inputs (which is important since they are typically
only read at the 1 KHz servo thread rate)

The MPG counters have names like:

hm2_7i96s.0.inm.00.enc0-count
hm2_7i96s.0.inm.00.enc1-count
hm2_7i96s.0.inm.00.enc2-count
hm2_7i96s.0.inm.00.enc3-count

Thanks, I don't know if I did it right but I got an error message.

Removed setp from HAL file and retested. No change in observed behavior.

Yes, multiple passes at same speed are perfectly aligned with previous passes. This is true even when machine is turned off overnight and turned on next day (and re-homed). I don't think I'm losing pulses in the stepper motor. You can usually hear the motor miss pulses, and the results are reproducible.

10 count per turn encoder results in delta Y per pulse of 0.0125" for 8 TPI. Seems like the error would be less that that, and I'm seeing 0.085" error at 200 RPM.

you need to install the build dependencies. See 4.2.2 in the linked documentation above.

Or you open "/usr/lib/python3/dist-packages/probe_basic/probe_basic.ui"
and change line 365:
<number>8</number> to <number>0</number>
Number "0" is first tab (main).

Hi Aciera

I use this 

$ git clone github.com/LinuxCNC/linuxcnc.git linuxcnc-source-dir
$ cd linuxcnc-source-dir/src

and I replace file trtfuncs.c  (inside skew func) on this step (correct right ?)
Then, cmd :

$ ./autogen.sh
$ ./configure --with-realtime=uspace

it's look good  and I use  cmd : $ make

it's loading and show in picture attach file  , this not complete compile right ?

Error :

/bin/bash: line 1: a2x: command not found
make: * [../docs/src/Submakefile:1001: ../docs/man/man1/5axisgui.1] Error 127

How to solve this problem ?
I think it's near succes with your help ^^"

Thank you,
Asis