Cant pull input pins of parallel port to GND, BB broken?

Hi all,

I just set up my lathe configuration with Linuxcnc.
I use the stepconf wizard with the very common cheap china 5 axis breakout board.
Everything works fine with the OUT pins and the steppers work fine.

But none of the IN pins seems to work.
I cant pull them to GND with a switch, they are always HIGH by the internal pullup of the parallelport.
I checked it with both HAL meter and an multimeter on the optocouplers.

I tried EPP and ECP modes, external pullups as described here but nothing works.

I have a second identical BB which has the same problem.

BTW the GND labeled port near the IN ports 10-15 has no connection to GND is this always with these BB ?

I would be very happy if someone could help me.

Many thanks for your help

Ralf

did you connect the 12-24V
it needs 12V Minimum to get the inputs to work
The inputs are isolated to its own GND
Here is my Video Channel advice on this BOARD

Hi pl7i92,

many thanks for your answer.
Everything works fine now, bad fault.
I thought I read 12-24 is just needed for spindle control.

Many thanks and best wishes

Ralf