DRO usage

I think you are right.
It seems I don't see volt change.
I mean.. with Halscope I don't see nothing... but with Xoscope I see a nice square wave...
This mean that encoder works fine at least.

What do you mean with "real oscilloscope"?
I've tried the encoder with a classic laboratory oscilloscope and the signal was a square wave... But, sorry, I don't mind the amplitude...
The interface from RS I've linked is only a "mechanical" interface, so if I see a square wave with Xoscpope on suond card
I suppose that kind of signal is the same that arrive to integrated parallel port on my pc.
Maybe my encoder output a wrong voltage amplitude signal...

Some update...
This afternoon I have check the signal at the end of the parallel cable...
Using
encoder phase A & phase B --> breakoutboard (on pin 2 that originally was used for Xclock and pin 3 originally for Xdit)--> parallel port cable ... and a real oscilloscope (LeCroy WaveSurfer 422) I don't see nothing significant...
So I made a new piece of custom cable to adapt DB9 encoder's terminal to DB25 paralle port.
Using
encoder phase A & phase B --> pp cable and a oscilloscope I see two square wave going more or less from 0V to 5V.
Not properly 5V...
I could say that the signal was from 0 to 4 V, with a spike on the rising edge of the signal that arrive to 5V for 1 or 2 sample and then goes to 4V.
The phase B was shifted on the left (in the time base axis) in respect of the phase A (the B rising edge was at half duration of the phaseA 4V level... if I'm able to explain)
So.. Now.. I have to try this configuration...

Here I am with some news.
Somethings works !
I create a custom cable that adapt DB9 connector at the encoder's end to DB25 cable that goes to the PP Port on the pc.
Using a "real" oscilloscope (LeCroy Wavesurfer 422) I can see the square wave signal from phaseA and PhaseB.
I use pin1, pin2 for phase A&B, and pin3 for index pulse on the DB25 cable (a mistake)
Tha HAL file that I use (found on wiki page under "Big DRO" thread) wants phaseA on pin2 and phaseB on pin3.
So I change config to use phaseA on pin1 and phaseB on pin2, but when I try to launch the HAL file I get an error "parport0.pin1 doesn't exist...
So using the original config I try to launch the HAL file..
and.....
The Xaxis dro change, following forward and backward the rotation of the encoder....
I mean... Now this working (?) config use phaseA on pin2 and pulseindex on pin3...
How can this work?
Counter component doesn't need phaseA and phaseB to work?
When attached to oscilloscope I notice that phaseB signal was shifted right respect phaseA signal (on the time scale), I think out of phase.
I thought that when phaseA was +5V, phaseB must be 0V or -5V...

Yes, it's clear...
What I can't understand is... How counter encoder can count using only 1 phase (in my case phaseB, looking at hal file and pinout of my soldered cable that have phaseA on pin1, phaseB on pin2 and index pulse on pin3) forward and backward?
Maybe I made two mistake that compensate each other...
Asap I will controll again pinout of my cable...