uart

UART (Universal Asynchronous Receiver/Transmitter)

• Requires only 3 lines (TX for transmit, RX for receive and GND)
• full-duplex
• No Clock Signal Needed
• Built-in Error Checking: It uses optional parity bits to help verify data integrity during transmission.
• a point-to-point topology
• keep 5V TTL UART cables under 5 to 30 meters. maximum cable run depends on the data transfer rate (baud rate)
• speed - 1 Mbps to 15 Mbps ?
• 3.3V, 5V, +/-15V, +/-5V Logic, The three most common voltage implementations are TTL/CMOS, RS-232, and RS-485.

USART

RS-232

?

RS-485

?

RS-222

?

questions

frame format ? OSI level ? phisical or logical ?

URLs

https://www.youtube.com/watch?v=0spc1Iroc-A