The B00517 USB-to-RS-232 adapter connects a USB port to compatible equipment with a serial interface. Its USB connection is USB 2.0 Type-A, and the serial side has a 9-pin RS-232 connector.
The listed CH340 chip and M/F connector configuration identify this variant. It provides a connection between a computer’s USB port and equipment that uses RS-232.
Use it when a USB host needs to connect to compatible serial equipment. The model is identified by code B00517, USB 2.0 Type-A, the 9-pin RS-232 connector and CH340 chip.