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 CI-V (Computer Interface 5) protocol uses a bi-directional, single-wire TTL signaling system where a single "DATA" line is held high until a device pulls it low to initiate communication. USB-to-Serial Conversion icom ci v usb interface schematic top
Connect a 4.7kΩ to 10kΩ resistor between the CI-V Tip and the 5V VCC pin on the USB module to ensure the bus idles high. Key Components List USB-to-TTL Module: FTDI FT232RL modules are highly recommended for driver stability. Diode: or similar high-speed switching diode . Resistor: 4.7kΩ (standard for CI-V). Plug: 3.5mm (1/8") Mono Phone Plug. Cable: Shielded audio cable to prevent RF interference. Software Setup The term could also refer to the top
a USB to CI-V interface you can use. to control a radio with CI-V remote control. port capability and common radio frequency. USB- ICOM CI-V - K7MEM Key Components List USB-to-TTL Module: FTDI FT232RL modules
: Solder the FT232RL to a PCB or prototype board. Ensure you have the correct configuration for the chip. The configuration EEPROM can be programmed using FTDI's software.
Simplest working schematic (top‑side parts):
) handles the USB protocol and provides TTL-level serial signals (TX and RX).