UART (Universal Asynchronous Receiver Transmitter)
It is software that directly interacts with your hardware to enable serial communications to other devices.
A "PCI Simple Communications Controller" is usually a PCI modem, but it can be other, sometimes unlikely devices, such as an audio or serial device.
RS-485 is a two wire serial protocol.
UART
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Peter W. Gofton has written: 'Mastering UNIX serial communications' -- subject(s): Operating systems (Computers), UNIX (Computer file) 'Mastering serial communications' -- subject(s): Digital communications, IBM Personal Computer, Programming
Universal Asynchronous Reciever Transmitter (UART) controls the speed of Serial Ports on Computers.
Synchronous serial transmission
fsb...front serial bus
UART
UART (universal asynchronous receiver-transmitter) refers to the logic on the motherboard that controls the serial ports on the board, and is sometimes referred to as the UART 16550.
The router.