We have supplied to one of our client for sending and receving SMS through our S7-300 controller using TC35 modem.
I have downloaded one application example for the same as available on intranet.
and modified according to my existing CPU its 313C-2DP (6ES7 313 6CE01 0AB0) + CP340 RS 232C. System is communicating with TC35 there is no fault in CP340 RS 232C.
But i am unable to send SMS even after giving it a send request and Tel No.
Kindly provide us and diagonostic tool if available or any other working example of sending SMS through S7-300 CPU along with the description or manual.