A very specific topic!
: 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. icom ci v usb interface schematic top
. These chips convert USB data into standard asynchronous serial signals. A very specific topic
+---------------+ | USB Port | | (VCC, D+, D-) | +---------------+ | | v +---------------+ | FT232RL | | (QFN-20) | +---------------+ | VCC | 5V | | D+ | USB_D+ | | D- | USB_D- | | TX | TTL_TX | | RX | TTL_RX | | GND | GND | +---------------+ | | v +---------------+ | Voltage | | Regulator | | (5V or 3.3V) | +---------------+ | | v +---------------+ | R1 | 1kΩ | | R2 | 1kΩ | | C1 | 10uF | | C2 | 10uF | +---------------+ | | v +---------------+ | Radio | | Interface | | (CI-V) | +---------------+ Connect the to the GND pin of the USB module
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CI-V requires an open-collector driver.