Icom Ci V Usb Interface Schematic Top

Usually auto-sensing, but commonly set to 9600 or 19200 bps in software. Uses Hexadecimal framing starting with "FE FE" (Attention). CI-V Communications Interface-V, Reference Manual 3.2

USB TTL TxD ---- 10k ----- Base of NPN Emitter - GND Collector ---- 1N4148 ---- CI-V data line | +--- 4.7k pull-up to 5V CI-V data line ---------------------------------------------- USB TTL RxD (with internal pull-up enabled) icom ci v usb interface schematic top

) to prevent the TX line from interfering with the RX line when the radio is sending data. Usually auto-sensing, but commonly set to 9600 or