I'm trying to connect a device to my laptop using a TTL to USB converter like this one
but it doesn't works
so I tried the following configuration
(USB to Serial, RS232 to TTL and then to the device)
And works perfect.
Both (USB to Serial and USB to TTL) are using the PL2303 driver.
The question is why the USB to TTL didn't work? it uses a different protocol?
Best Answer
You may well have gotten bit by a fake Prolific 2303 chip.
The Prolific driver download site has a warning and also says how to detect the fakes.
Basically, check the Windows Device Manager. If your Serial/USB device shows a yellow warning triangle and has error code 10, then you have a fake. It will not work with newer Prolific drivers.
You might find an old Prolific driver that will work with your device. There are lots of sites on the internet discussing this, and lots of advice on finding old drivers.
You might also just save yourself the time rooting around the internet and buy or order an adapter from someplace reliable so that you don't get burned by another fake and don't have to worry about the drivers.