serial port access

I'm a newbie in Squeak, and i'm in a desperate need to use a serial port to comunicate with an external device.
I've found the System-Serial Port, but i really need to see a working code example.
Can anyone help? I just need to send some bytes and read the answer.

Thanks in advance,
    Juliano
_______________________________________________
Beginners mailing list
Beginners@xxxxxxxxxxxxxxxxxxxxxxxxxx
http://lists.squeakfoundation.org/mailman/listinfo/beginners