Looking at the diagram in the manual again, I thought that if I use R = 4.7k, the PIC pin will see 5V when the FLT output is disabled, and 0V when the FLT output is enabled. With nothing passing through the FLT optotransistor in the EM806 ie. with no fault, the PIC pin should see 5VDC on the input, if the FLT optotransistor is enabled, it would pass current down to 0VDC, thus bringing the PIC pin down to 0VDC. Or am I missing something?

Regards,
T.

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