Like mine, the actual conversion from USB to serial is done by a Prolific PL-2303 USB to Serial Bridge Controller buried in the connector.
I bought a Icidu C-707607 USB to Serial cable. In case the serial port is a DB-9 connector or RJ45 connector, you need a USB-to-serial adapter. Top right: two different methods to convert a DB-9 to a RJ45 connector. Bottom right: male-to-female DB-9 adapter. Bottom center: a USB-to-serial adapter with male DB-9 connector. On the left: regular USB cable with micro-B and mini-B connector.
