Icom Ci V Usb Interface Schematic Top 〈EASY · 2025〉

Data from CI-V bus to PC RXD.

  • Output side (PC):

    • The term "schematic top" often refers to the high-level hierarchical view. Here is the functional breakdown of a standard CI-V USB interface:

    [USB Port] → [USB-to-UART bridge] → [Opto-isolation stage (TX direction)] → [Buffer/Driver] → [CI-V connector (3.5mm TRS)]
                                                    ↑
[CI-V connector] → [Signal conditioning] → [Opto-isolation stage (RX direction)] → [UART RX]

    Most DIY designs use two optocouplers (typically 6N137 or PC900 for speed, or 4N35 for lower baud rates) to decouple the radio ground from the computer ground.

    Notes: