Sorry if this question has been answered before, but these forums are amazingly difficult to search (results are shown across pages with post content instead of just titles).
I am attempting to use an IO60P16 board to drive an opto-coupler buffer so that I can drive a 24 V digital signal to another device. The buffer circuit has a 1 kOhm resistor built in.
When I connect the board to the IO60P16, the output pin of the IO60P16 drops from 3.3 V to approximately 1.5 V, leading me to believe that the chip has enabled an internal resistor for overload protection.
Indeed, the IO60P16 MCU has a slew of ResistorMode values to choose from: but these are only used in the InputPort constructor.
How can I specify a ResistorMode on an OutputPort pin?
Note: when I attach the same circuit to a breakout board on my mainboard, the opto-isolator works just fine.