Icom Ci V Usb Interface Schematic Top

The Icom CI-V (Computer Interface 5) USB interface schematic typically centers around a USB-to-Serial converter IC, such as the FTDI FT232RL Go to product viewer dialog for this item. Go to product viewer dialog for this item.

The CI-V protocol is a bi-directional, single-wire TTL system. Unlike standard RS-232 serial communication which uses separate Transmit (TX) and Receive (RX) lines, CI-V combines them into one "DATA" line. Idle State: The line is held high (+5V TTL). Collision Detection: If the line is low, the bus is "busy". icom ci v usb interface schematic top

Thus, every robust CI-V USB interface schematic includes opto-isolation on both the receive and transmit paths. The Icom CI-V (Computer Interface 5) USB interface

Important connections for a correct CI‑V interface

CI‑V uses inverted, open‑collector logic (one‑wire bidirectional data).
The USB side (UART) is standard TTL (non‑inverted). So you need: Thus, every robust CI-V USB interface schematic includes

Here’s a useful reference schematic (top-level) derived from common amateur radio designs:

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4. Detailed Schematic (Top View / PCB Layout Considerations)

The term "top" 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: