Ok this is a common problem, what I have noticed is that it is usually a baud rate problem, here are two things to try they should get you connected.Try them in this order and leave the first one as I described when you try the second one.

1, Try choosing psi host, even though it is under a GCM it doesn't seem to matter and you will be able to jump over to other devices.

2, Try it at 1200 baud, what your program says the baud rate is means very little it all works better at 1200, to change your baud rate you must do it in the site setup and also under PSI in the functions menu once you have them set hit file save and exit the program reenter the program and choose that site, you should be talking.

There is no need to sign on with PSI unbder GCM, all of the same functions are there when you sign on with PSI HOST.