“ADC” = Analogue to Digital Converter - so I would expect this to be an input.
But the IoT Connector Design Specification (4117166, Rev 4), Section 3.8, calls it an “Output”.
There is a note saying, “Direction with respect to IoT Connector” (sic); but that doesn’t really help, as a “connector” just passes signals through - in one side and out the other!
If it was an output from the IoT board (“module”?) towards the Host, that would make sense to me.
The mangOH schematics seem to show it as an output from the magOH main board to the IoT connector.
The mangOH Developer’s Guide is unhelpful - it just shows everything with 2-way arrows!
A diagram with clear direction arrows would be best.