With chinese copies I would not even trust the ones with FDTI chip... because fake cables have fake chips...
Try a RS232 based adapter, like the ELV VDA100 (cheap to buy as a kit off a german website). If your PC does not have a RS232 port then get a Brainboxes US-101 adapter (USB - RS232). Don't fall for a 5£ ebay USB - RS232 adapter... it won't work because they are rubbish.