5 protocols
I2C Inter-Integrated Circuit
Serial Bus Single-ended 3.4 Mbps 10 meters Multi-drop Bus Embedded Systems 1980
SPI Serial Peripheral Interface
Serial Bus Single-ended 50+ Mbps 10 meters Point-to-Point Embedded Systems 1980s
UART Universal Asynchronous Receiver-Transmitter
Serial Interface Single-ended 115.2 kbps 15 meters Point-to-Point Embedded Systems 1960s
CAN Controller Area Network
Vehicle Bus Differential 1 Mbps 1000 meters Multi-drop Bus Automotive 1983
RS-232 Recommended Standard 232
Serial Interface Single-ended 115.2 kbps 15 meters Point-to-Point Computer Systems 1960