Icom Ci V Usb Interface Schematic — Top Updated

: Common chips include the FTDI FT232RL or Silicon Labs CP2102 .

The schematic outlined below uses . This completely separates the computer ground from the radio ground, utilizing light to transfer data. This eliminates ground loops, drops the RF noise floor, and protects your hardware. System Schematic Overview icom ci v usb interface schematic top

PC SIDE (USB POWERED) │ RADIO SIDE (RIG POWERED) │ ┌───────────────────────┐ │ ┌──────────────────────┐ │ │ │ │ │ │ USB-to-UART │ │ │ 3.5mm MONO JACK │ │ Bridge IC │ │ │ (To Radio) │ │ (FT232RL / CH340) │ │ │ │ │ │ │ │ ┌───┐ │ │ TXD ───[1kΩ]───┐ │ │ │ ┌────┤TIP│ CI-V Bus │ ▼ │ │ │ │ └───┘ │ │ ┌───┐ │ │ ┌─────┼──┘ │ │ │LED│ │ Optical │ │ │ ┌──────┐ │ │ └───┘ │ Coupling│ ┌─┴─┐ │ ┌────┤SLEEVE│ Ground│ │ │ │ ───► │ │Rx │ │ │ └──────┘ │ │ GND ───────────┴────┼──────────┼──┤PT ├─┐ │ │ │ │ │ │ └─┬─┘ │ │ │ │ │ │ │ └───┼─┼──┘ │ │ RXD ◄───────────────┼──────────┼────────┼─┼──┐ │ │ │ │ │ │ │ │ │ ┌─┴─┐ │ ┌─┴─┐│ │ │ │ │Rx │ │ │LED││ │ │ │ │PT ├────────┼◄── └───┘│ │ │ │ └─┬─┘ │ │ │ │ │ │ │ │ ├──┘ │ │ │ VCC (+5V) ──[10kΩ]──┴──────────┼────────┼─────┘ │ │ │ │ │ └───────────────────────┘ │ ▼ 1N4148 │ │ ─── │ │ │ │ │ ▼ │ Use code with caution. Detailed Wiring & Circuit Logic 1. Transmit Path (PC to Radio) : Common chips include the FTDI FT232RL or

Because it is a shared bus, data sent by the PC is immediately seen by the PC's own receiver. Software designed for Icom radios expects this local echo and handles it automatically. Schematic Architecture: USB-to-UART with Optoisolation This eliminates ground loops, drops the RF noise

Alternatively , a separate isolated DC-DC converter (e.g., B0505S) can generate a floating 5V for the radio side, eliminating the need to draw power from the radio.