The BeagleBone Black serial port provides low speed +3.3V TTL
RS-232 data communication with a wide variety of devices, such as
sensors, displays, ADCs, and DACs. There are four serial port UARTs
/dev/ttyO5), each of which connects to a receiver
RX) and transmitter (
For more information, see:
Do not connect the BeagleBone Black serial port to 12V RS-232 serial ports, which are found on many older computers.