Quote Originally Posted by Ioannis View Post
Although I am sure it works on PC with just TX, RX nd Gnd, have tried to connect to PC just with these 3 wires?
I tried it now, I could not type in my hyperterminal anymore as soon as I connected my modem to the PC with only 3 wires. As soon as I connected 9 pin serial cable, everything starts working fine.

Also are you sure about 4800 baud?
Yes, baud rate is 4800.