Hi
thanks for the quick reply
try using 0x0d and 0x0a ( ENTER ) button of the keyboard,,
what did you mean exactly?
when I write AT+CMGS="mobile no" then I hit enter, it gives me ">" and if I hit enter again, it gives me ">" on the second line. but when I hit CTRL+Z, then the error came out.
according to this reference
**broken link removed**, error 512 means "manufacturer specific".
But I still don't get it what should I do to fix this.
---------- Post added at 17:45 ---------- Previous post was at 17:42 ----------
For additional information, before I tried several GPRS AT Commands to open web page, everything was fine, I were able to send sms with AT+CMGS, but now the error came.
---------- Post added at 17:49 ---------- Previous post was at 17:45 ----------
I also tried to reset factory the modem using AT+WRST and AT&F, but it seems nothing change to the configuration, it still the same configuration as before and still got the error when I send SMS.