Trying to communicate with SonyEricsson T68 using AT Commands.
Have studied several other projects that use AVR to send/receive SMS. Seems pretty straightforward.
For initial testing PC (Bray's Terminal) is used to send AT Commands to phone. MAX232 in between.
Anything sent from PC is immediately echoed back but PC never receive the expected "OK".
20 seconds after last AT Command is sent phone send "ERROR" to PC.
Have tested two T68 with same result so the problem should not be due to broken phone.
Obviously RS232-communication works since the phone reply.
Sending gibberish is echoed but phone don't reply with "ERROR".
I expected this first simple test sending "AT" and getting "OK" to work easy.
Most of my time yesterday was spent to searching on Internet for some explanation.
What am I missing?