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In case it's used for communication with a PC it should be combined with a USB to TTL serial converter or a classic RS-232 driver. The firmware makes use of the MCU's hardware UART or a bit-bang software UART. The TTL serial interface is enabled in config.h (see section "Busses"...
In this case enable BAT_EXT_UNMONITORED to prevent problems with the automatic power-off by a low battery. This will also set the "ext" battery status when powered by the external power source. The tresholds for a weak and a low battery are set by BAT_WEAK and BAT_LOW while BAT_...