I havent heard of that chipset so cant comment, but if it is not showing any errors, the next test then is to see if it is wired correctly
You need a very fine piece of wire and will short the Tx and Rx pins in the Rj connector.
Then send a command using something like Hyperterm ( You can also use my PEC editor to do this. )
On sending a command, you should see it echo back if it is working and wired correctly.
Before doing this, ensure there is no 5V power coming out of the adapter to the RJ plug
it should only have 3 wires "connected"
I have attached the wiring for a 507, but the 505 is wired identically, it just doesnt have the 2 unused slots on either side.
Andrew Johansen Melbourne Australia