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
Pins 11 and 12 of the MAX232 are tied together to form the bi-directional CI-V data line. icom ci v usb interface schematic top
If you tell me which Icom radio model you are using (e.g., IC-7300, IC-7000), I can provide the exact pinout and recommended interface configuration . You can assemble this circuit easily on a
You can assemble this circuit easily on a small piece of stripboard or prototype perfboard. Keep all component leads short to minimize RF pickup. If you want a cleaner build, you can purchase cheap pre-made FT232RL breakout boards, solder the 1N4148 diode and 4.7k resistor directly to the pin headers, and run a shielded cable out to your 3.5mm mono plug. Step 2: Driver Installation Step 2: Driver Installation Ensure your software (e
Ensure your software (e.g., HRD) uses the correct hex address (e.g., 94h for IC-7300, 4Eh for IC-706).
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.
Asynchronous serial, 8 data bits, no parity, 1 stop bit (8N1).