7i77 and single ended MPG-Wheel encod er - read-out problem

I have 4.75V 7i77 output voltage and 4.1V between GND and A/B when A/B are connected to the card.
Basically, the output voltage seems to  be enough, as i have a swinging signal, when not connected to the card:
As soon as I unplug A/B, I have the same meassuring results from yesterday evening.

There are some BC327 transistors, prior to the output.

I already dismounted the transistors and checked them, they are fine.

P.S. maybe, I need "real sinking" inputs without the pullup resitors ? - just a thought...

Ahh if they have PNP transistor outputs, the MPG has sourcing
outputs so would need a stiff pulldown resistor to work with the
7I77 encoder inputs (say 330 Ohm)

They should work directly with the 7I77s MPG inputs
(since those are sinking inputs)

we're getting closer

So, I need to change the onboard pullups from 2k to 330Ohm ?

Edit: saw your edit, right now. That's what I thought and wanted to express with the sinking- inputs "P.S" in my prior post. 

But then, we are at the HAl-Connection point, which I asked yesterday

To use the 7I77 encoder input you would need to
add external 330 ohm pull downs to A and B

You could use the 7I77s MPG inputs directly.

Yeah, that's clear now to me.

I'm just not completely sure, how to set up the HAL for this.

Actually, I have:
The count and axis selection is (more or less), as PNCconf proposes it.

As I saw in an other thread, I have to add a mux4 and send the signals into it. That's exactly, where I'm not sure, how to do it

if you want to use the MPG counter, it would be something like:

hm2_5i25.0.7i77.0.0.enc0.count