Icom Ci V Usb Interface Schematic Top ((exclusive)) -

If you look at the official Icom schematic (often found in the service manuals for the CT-17), they include a 74LS05 or 74HC05 Hex Inverter chip.

Purpose: This allows the TX pin to pull the bus low but prevents it from forcing the bus high, maintaining the open-collector requirement. icom ci v usb interface schematic top

Connects to the PC, usually via a standard USB-A or Micro-USB connector. Conversion Logic: TXD (Transmit) RXD (Receive) If you look at the official Icom schematic

------------------------------------- | USB-B socket | CI-V jack | | | (top edge) | | FT232RL IC2(6N137) Q1(2N3904) | | | | | IC3(6N137) 78L05(optional) | |------------------------------------ icom ci v usb interface schematic top

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The CI-V bus is an , bi-directional, single-wire system operating at TTL (5V) logic levels .