Maybe it uses a kernel module that isn't included in your kernel. I don't know what ROM/kernel you are using (I use stock), but possibly the pl2303 module. If you have a Linux PC handy, you can check for some info. Before plugging it into the Linux box, open a terminal and run this command:
tail -f /var/log/messages
Then plug it in, and see what it tells you. Use Ctrl + c to end it.
You can also check which modules are loaded with this command, new modules are at the top of the list:
I also am not sure if I would ever use something like that. My ZT-180 came with something similar, but with a miniUSB end, and I have never found the need to even try it.