When the channel inputs are analog voltages, the update rate of the channel values is approximately 50 Hz (each channel updates every 20 ms or so). Each channel’s value is the result of a 16-sample average of analog-to-digital conversions.
The TReX measures analog voltages with 10-bit resolution. The raw channel value is provided as a number ranging from 0 to 1023, where 0 corresponds 0 V and 1023 corresponds to 5 V. Your channel source can be as simple as the output of a potentiometer whose inputs are the channel’s associated power (make sure the BEC jumper is in place) and ground connections.
Unlike with RC signals, the TReX has no way of telling if a channel is receiving a valid analog signal. A disconnected channel will still produce a result when run through the analog-to-digital converter. This poses two potential problems: