To use the CG 3000 antenna tuner for remote operation there is a control box (CTU) that could be purchased from the manufacturer. Some people want to make such a control box themselves. Here is the schematic info.
Thanks to https://sp5kab.pl/pl/sterownik-cg-3000-cg-antenna-tuner-control-unit for doing the work with determining the schematic
K9EQ made a good description of the Icom AH-4 antenna tuner including the signalling interface from the radio to the tuner and from the tuner and back to the radio. I did take the liberty to post the pdf here. Credit: K9EQ
AH-4_Design_and_Operation
Rock Seven has launched a board that takes care of the PSU and antenna requirements to support the Iridium 96090 module https://www.iridium.com/products/iridium-9602/
http://www.rock7mobile.com/products-rockblock.php?gclid=EAIaIQobChMI1ZWSqv2C3gIVRawYCh2DBQ7eEAAYASAAEgI3vfD_BwE
This enables fast time to market and coverage in remote areas on customers IoT devices.