It's a serial port in microprocessors, such as the Atmegas we use in ArduPilot, that handles all the communications (buffers, handshaking) in hardware. Much more efficient than doing it with software.
without being too blunt - do at least some basic attempt / search to find information...it will go a long way when others decide should they answer your question(s)
Replies
UART
without being too blunt - do at least some basic attempt / search to find information...it will go a long way when others decide should they answer your question(s)