Some devices, e.g., ESP8266-01 wifi modules, GNSS receiver modules, Particulate Matter sensors and others have a 'start-stop signalling' RS232 type of serial interface for exchanging data. A USB to UART ( Universal Asynchronous Receiver Transmitter ) converter is required in order to display the data using a serial terminal program on a pc for example. Other uses include: alternative if no legacy COM port, provides a virtual COM port, provides usb connectivity, for retreiving raw data for display and parsing, connect with devices having a uart interface, connect with usb to a micro-controller uart peripheral. It's an extremely useful item.
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USB-UART converter connected to ESP8266-01 wifi module
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TX and RX data shown in a serial terminal application
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