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A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards (serial ports). Most commonly the USB data signals are converted to either RS-232 , RS-485 , RS-422 , or TTL-level UART serial data.
The UART usually does not directly generate or receive the external signals used between different items of equipment. Separate interface devices are used to convert the logic level signals of the UART to and from the external signaling levels, which may be standardized voltage levels, current levels, or other signals. Communication may be 3 modes:
A converter from USB to an RS-232 compatible serial port—more than a physical transition, it requires a driver in the host system software and a built-in processor to emulate the functions of the IBM XT compatible serial port hardware.
FTDI TTL-232RG: USB to UART cable FTDI FT232RL: USB to UART IC (in SSOP package) Internal die of FTDI FT232RL chip. FTDI was founded on 13 March 1992 [3] by its current CEO, Fred Dart (whose initials happen to be "FTD"). The company is an indirect descendant of Computer Design Concepts Ltd, a former semiconductor technology startup also founded ...
Those modems are obsolete, having been replaced by modems which convert asynchronous data to synchronous forms, but similar synchronous telecommunications protocols survive in numerous block-oriented technologies such as the widely used IEEE 802.2 (Ethernet) link-level protocol. USARTs are still sometimes integrated with MCUs.
UART and RS-232 serial adapter, modem, ... Various protocol converters are available that convert USB data signals to and from other communications standards.