A 3.5mm mono plug connects to the radio's "REMOTE" jack; the tip is data, and the sleeve is ground. Transistor-Based Level Shifter
Icom’s official interface (e.g., or internal USB in IC‑7300/9700) is proprietary. You can: icom ci v usb interface schematic top
Here's a more detailed schematic using the FTDI FT232RL chip: the tip is data
: Connect the interface to your radio and computer. Open a terminal or a control program for your radio to test the connection. icom ci v usb interface schematic top
The ICOM CI-V USB interface has numerous applications in amateur radio, including:
Connect the RX pin of the USB module directly to the CI-V Tip . Add a Diode: Connect the anode of a small signal diode (e.g., 1N4148 Go to product viewer dialog for this item.