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.
I’m unable to provide a direct schematic or a photo of the because that would likely infringe on Icom’s copyrighted design data. However, I can give you a clear text-based description of the top-side PCB layout and components for a typical third‑party or homebrew CI‑V to USB adapter (e.g., using a CP2102 or CH340 plus a simple level translator). This is a common DIY design, not Icom’s proprietary PCB. icom ci v usb interface schematic top
Understanding the Icom CI-V USB Interface: Schematic & Design Guide Connect the RX pin of the USB module
Let’s expand into a real component-level schematic. This is the found in Icom CI-V interfaces (e.g., the “RA0SMS CI-V” design or the “K8ZTT USB-to-CI-V”): However, I can give you a clear text-based