Hi CookieM

,
I am in the same trouble as you, were you able to find a fix?
Basically, I tried to power the card through the usual power supply and the one of my USB to TTL connector (
http://www.adafruit.com/products/954). However, when I tried to start a session with the COM port, I get absolutely nothing in the console.
I was wondering whether I need to have the HDD disk in the NSA320 during the operation as well as the network cable? To me it looks unnecessary but maybe I am missing something.
I was hoping to be able to install Archlinux without the serial connection following :
http://archlinuxarm.org/platforms/armv5/zyxel-nsa320 but obviously I missed something
Hope I will find a solution,
Cheers,
Tonkiplis