Icom Ci V Usb Interface Schematic Top [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 .
Configure your USB-to-UART module’s voltage jumper to 5V . Do not leave it on 3.3V, as Icom TTL logic requires 5V thresholds.
There is between the computer's ground and the radio's ground, protecting your radio's delicate microprocessor from power surges. 3. The Legacy Option: Transistor-Based CI-V Interface
This circuit diagram breaks down the components inside the "CI-V Level Shift" block. It is a bi-directional level converter and bus interface. icom ci v usb interface schematic top
Type-B USB chassis mount (or tethered cable) and a 3.5mm mono jack. The Master Interface Schematic
: The interface converts standard computer signals to the 5V (TTL) levels required by the radio.
USB TTL TxD ---- 10k ----- Base of NPN Emitter - GND Collector ---- 1N4148 ---- CI-V data line | +--- 4.7k pull-up to 5V CI-V data line ---------------------------------------------- USB TTL RxD (with internal pull-up enabled) If you tell me which Icom radio model you are using (e
When the USB TXD pin is High (Logic 1), the 1N4148 diode blocks current. The CI-V bus floats High via the radio's internal pull-up resistor.
Beginners and those who want a reliable, compact build inside a USB cable or small box. Common Chips: FTDI FT232RL, CH340G, CP2102.
At the hardware level, CI-V is a that operates at TTL voltage levels (0 and +5V) . It uses a single data line plus a ground, a significant difference from the separate Transmit (TX) and Receive (RX) lines found on a standard RS-232 or USB serial port. There is between the computer's ground and the
For decades, Icom’s protocol has been the backbone of computer control for Icom transceivers. Whether you own an IC-7300, IC-9700, IC-705, or a legacy unit like the IC-706, the ability to link your radio to logging, digital mode, and remote control software transforms your operating experience.
On most Icom radios, the CI-V port is a , typically labeled "REMOTE" . The connector has two conductors:
Always double-check your plug wiring. On Icom CI-V jacks: