Icom Ci V Usb - Interface Schematic Top 'link'

: Install any necessary drivers on your computer. FTDI provides drivers that allow the USB interface to appear as a virtual COM port.

Many cheap interfaces omit the inversion on TxD and just swap RX/TX – this fails with Icom because the protocol expects the idle state inversion. icom ci v usb interface schematic top

Notes:

(e.g., 1N4148) is often placed between the TXD line and the CI-V bus to prevent the chip from "fighting" incoming signals when not transmitting. pull-up resistor : Install any necessary drivers on your computer