Yes, a
RS232 to USB converter does have a full-blown UART circuit built-in. As any standard UART, it
does have Rx, Tx, and flow control pins. ... When data is there, the
USB side returns the piece of data.
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USB to RS232 adapter cable connects from the USB-A port of a computer to a device with a female DB9 port; Bus-powered Serial to USB adapter connects to devices for configuration or programming.