Comfort Automation/ Security System Forums

The 12V external PS is now connected and working as expected.

The external 12V cannot be left \"hanging\".

I had to ENSURE that the 12V external supply had the SAME common as the 12V supplied by Comfort. Connecting them together (Comfort COM (0V) and external PS -V (0V))

The 12V external PS is now connected and working as expected.

The external 12V cannot be left \"hanging\".

I had to ENSURE that the 12V external supply had the SAME common as the 12V supplied by Comfort. 
Connecting them together (Comfort COM (0V) and external PS -V (0V))

Ah  yes, you need a common ground so the power supply is not floating