I bought this USB to TTL cable: https://www.amazon.co.uk/dp/B01DC0S13M
Since it apparently uses the PL-2303HX chip, I downloaded the driver for Windows here: http://prolificusa.com/portfolio/pl2303hx-rev-d-usb-to-serial-bridge-controller/
After that, I connected the USB to the PC and the TTL pins to a single board computer. Unfortunately, my PC hasn't detected the cable, because Device Manager doesn't list a COM port for it.
Is there a way to check if the cable is faulty? I don't have any other USB to TTL cable, so it could be something besides the cable.