Q:
We're working on a project to turn old 100W transceivers (like the IC-725 & FT-450D) and RPi5's into dedicated autonomous JS8 and ARDOP stations.
I'm looking for a supplier of ATU-100 or similar where it's possible for the Raspberry Pi to read the power and SWR from the ATU over USB-C so it can prevent TX if the Power exceeds the user's licence or the SWR goes high. For example, an ATU-100 7×7 with STM32 (not PIC) and USB-C serial output reporting Pforward, Preflected & SWR with ATU up to 100 W at 10-80m.
A:
The AT-100M Pro currently doesn't support remote control.
If digital signals are required, this may not be possible.
If you want to implement this in the short term, you can only connect hardware pins. This requires three wires, connecting GND to the positive and negative resistor pins, respectively. Obtain the forward and reverse voltage values, and then calculate the SWR and power.