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

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09 Mar 2019 20:39 #128179 by tom-rock
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
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11 Mar 2019 06:54 - 11 Mar 2019 06:57 #128292 by pl7i92
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
Last edit: 11 Mar 2019 06:57 by pl7i92. Reason: more infos

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12 Mar 2019 15:36 #128445 by tom-rock
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

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