Hi kutya.
I was going crazy searching the internet for information on
how to connect a CPU 315 with a CP340 to a tc35i modem to 
call and send sms. I managed to call and send sms through
a 1214 and a CP1241 without problems but it seems that
the same functions of the CPU 1214 are not valid for 
the CPU315. I have CP340 configured in Ascii, 9600, 
8N1. Could you tell me what functions you used ...
...you would extend my life considerably. 

Thank you very much for your contribution.

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Split from CP340 and TC65T.