: Solder the 1N4148 diode and 10k resistor between the TXD and RXD pins as specified in your chosen schematic to create the single-wire bus. Wire the 3.5mm Jack Connect the of the 3.5mm mono plug to the combined TXD/RXD line. Connect the to the GND pin of the USB module.
: A 7417 hex buffer or simple switching transistors (e.g., 2N3904) are frequently used to handle the open-collector drive. Popular Schematic Variations icom ci v usb interface schematic top
(anode to RXD/CI-V, cathode to TXD) to prevent the radio from being driven high by the TX pin when idle. : Solder the 1N4148 diode and 10k resistor