Don´t works digital output

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1

Hi everybody

I’m working with the k8055 module. Ans it seem that works fine.

But today i’m trying to connect a relay in one digital output.

I connect the clamp and ground and i activate all digital outputs.

The leds on the board lights ok but my external led don´t light.

I put a voltimetter in the output and i read 0.6 vols

What are i doing wrong?

Thank you very much

2

The digital outputs of the card are open collector outputs, so there is no voltage coming out of them.
You have to use an external voltage source.

You’ll find a lot of discussion of this topic from this forum. Please use the search (search “open collector”).

Please look also the K8055 manual how to connect a relay to the digital outputs of the card.