Usb Interface Schematic - Icom Ci V

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Usb Interface Schematic - Icom Ci V

PC side (USB) Radio side (CI-V) TXD ────┬───► 6N137 anode ────┬───► Output transistor base │ (LED side) │ RXD ◄─── 6N137 output ◄─┘ │ └─── open-collector to radio data pin with pull-up (4.7k to 5V)

Whether you want to build your own adapter or repair a commercial one, this article breaks down the core circuit, explains the critical components, and highlights common pitfalls. Icom’s CI-V (Communication Interface-V) is a proprietary serial protocol used to control Icom radios (e.g., IC-7300, IC-9700, IC-718) from a PC. Icom Ci V Usb Interface Schematic

If you need a ready-made PCB, look for “U5-Link” or “DigiRig” – both are open-design and follow the same schematic shown above. Radio CI-V connector (3

Radio CI-V connector (3.5mm stereo): Tip – Data (open-collector) Ring – +5V or +8V (not always present) Sleeve – Ground : Many modern Icom radios have a 3.5mm “REMOTE” jack – Tip = DATA, Sleeve = GND. Ring is unused or +V. Most Common & Reliable Schematic: The “Opto-Isolated” Design This is the gold standard for CI-V interfaces. It uses two optocouplers (or one dual) to fully separate grounds. It uses two optocouplers (or one dual) to

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PC side (USB) Radio side (CI-V) TXD ────┬───► 6N137 anode ────┬───► Output transistor base │ (LED side) │ RXD ◄─── 6N137 output ◄─┘ │ └─── open-collector to radio data pin with pull-up (4.7k to 5V)

Whether you want to build your own adapter or repair a commercial one, this article breaks down the core circuit, explains the critical components, and highlights common pitfalls. Icom’s CI-V (Communication Interface-V) is a proprietary serial protocol used to control Icom radios (e.g., IC-7300, IC-9700, IC-718) from a PC.

If you need a ready-made PCB, look for “U5-Link” or “DigiRig” – both are open-design and follow the same schematic shown above.

Radio CI-V connector (3.5mm stereo): Tip – Data (open-collector) Ring – +5V or +8V (not always present) Sleeve – Ground : Many modern Icom radios have a 3.5mm “REMOTE” jack – Tip = DATA, Sleeve = GND. Ring is unused or +V. Most Common & Reliable Schematic: The “Opto-Isolated” Design This is the gold standard for CI-V interfaces. It uses two optocouplers (or one dual) to fully separate grounds.