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Whats differences between NI PCI 6518 and 6519

Hallo!

Can you please explain me differences between NI-PCI6518 and 6519 digital I/O cards?
In other words whats differences between "source outputs" and "sink outputs"?

Thank you

Andrey
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Source- current flows out of the device that provides a voltage source
Sink- current flows into the device that provides a ground
 
Here's a good 'Source" that talks about it 🙂
 
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