The collector of this phototransistor is wired directly to the CI-V Tip line. The emitter connects to the Radio Ground (Sleeve).
Connect the collector of the TX optocoupler's output transistor directly to the CI-V signal line. Connect a high-speed switching diode (such as a 1N4148) between the TX line and the input of the RX optocoupler. How it works:
Thus, on both the receive and transmit paths.
Because the interface sits right next to an RF transmitter, stray stray currents can cause the USB connection to drop out during transmissions.
If you do not want to solder surface-mount ICs like the FT232RL, buy a cheap . Connect the board's GND to the 3.5mm jack Sleeve . icom ci v usb interface schematic top
The term could also refer to the top side of the PCB or top layer routing in an EDA tool like KiCad or Eagle. For a successful layout:
The ICOM CI-V USB interface works by converting the CI-V signal from the ICOM radio to a digital signal that can be transmitted over USB to a computer. Here's a step-by-step explanation of the process:
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
: Connects to the PC; the converter chip is powered by the USB 5V line. Radio Side : Uses a 3.5mm mono phone plug . Tip : Data signal (bi-directional TTL). Sleeve : Ground reference. Icom IC7300 A to Z #27 CI-V Settings The collector of this phototransistor is wired directly
Place a SMD ferrite bead on both the USB 5V line and the CI-V tip line.
To maintain high data rates (up to 19,200 bps or 115,200 bps for newer rigs), high-speed optocouplers are required. Standard 4N25 or 4N35 optocouplers are too sluggish and will distort the data pulses.
If you are ready to begin sourcing parts or laying out your board, I can help you refine the details. Let me know: Which you are building this for.
Implement two entirely separate ground copper pours. Label one GND_USB and the other GND_RADIO . Never connect them together on the board. Connect a high-speed switching diode (such as a
This guide provides a high-performance, optically isolated USB-to-CI-V interface schematic designed to protect your radio from ground loops and electrical noise. Understanding the Icom CI-V Protocol
While Icom sells official interfaces (e.g., CT-17), many operators prefer building their own . The search term "icom ci v usb interface schematic top" typically refers to the top-level or primary schematic diagram for converting USB (via an FTDI or CH340 chip) to the opto-isolated, half-duplex TTL serial required by CI-V.
To build the most popular and reliable version (Design #1), you will need:
To verify your design before building, what specific are you planning to control, and would you like a bill of materials (BOM) for these exact components? Share public link
pull-up resistor (R5) between and the 3.5mm Jack Tip .
: Used on the USB power line and radio data lines to block RF interference and noise. Isolation Transformers