Network key connect me

I have a Connect Wi-ME (integration kit) and try to configure it… I have discover it with a ad-hoc network from my pc, and try to set the correct parameters so I can use it with my access point. The problem is the Network key.
When I click applay i get the message: “The network key must be in hex form”.
But what if the network key is f.ex. “kfrss”?

I assume you need to convert :
http://asciitable.com/

“kfrss” = 0x6b46727373

Paul