Ensure the hex address in the software matches your radio's specific CI-V address (found in the radio's internal menu).
Now, with your schematic in hand and this guide by your side, you are ready to build a CI‑V USB interface that not only works but works correctly—and that is something that no "complete" schematic can ever replace.
Connect the cathode (Pin 3) of directly to the 3.5mm Jack Tip . Install a 4.7 icom ci v usb interface schematic top
If you need help choosing software for or logging ?
Connect the anode of the diode to the RXD pin using a small piece of hookup wire. Ensure the hex address in the software matches
+----------------+ +----------------+ +-------+ +---------------+ | | | | | | | | | USB Port +------+ USB-to-TTL +------+ CI-V +------+ Icom Radio | | (PC) | | Serial Adapter| | Level | | (CI-V Port) | | | | (e.g., FT232R)| | Shift | | | +----------------+ +-------+--------+ +---+---+ +-------+-------+ | | | | | | | +5V, GND, TX, RX | Data, GND | Data, GND | (TTL Levels) | | | | | +-----------------------+ | | v (Shared CI-V Bus)
How you plan to of the circuit (external 5V, isolated DC-DC converter, or ACC port)? Install a 4
A 1N4148 steering diode is placed in series with the second optocoupler’s LED input to protect the circuit and prevent it from latching.