Icom Ci V Usb Interface Schematic Top Upd Guide

To build a modern USB version, you need a (often based on the FTDI FT232RL or CP2102 chips). The "Two-Diode" or "Shorted" Method

For a more robust "top-tier" design that prevents data collisions and protects your radio, use an like the 7417 or 7407 . Simple Icom CI-V Interface - QSL.net icom ci v usb interface schematic top

The simplest way to interface a standard USB-to-TTL module (which has separate TX and RX pins) with the single-wire CI-V bus is to bridge the signals. To build a modern USB version, you need