LTE Module Series
AG35 SMTP AT Commands Manual
AG35_SMTP_AT_Commands_Manual Confidential / Released 7 / 30
1.3. Description of Data Mode
The COM port of AG35 module has two working modes: AT command mode and data mode. In AT
command mode, the inputted data via COM port will be treated as AT command, while in data mode, it will
be treated as data.
Inputting “+++” or pulling up DTR (AT&D1 should be set first) can make the module exit from data mode.
To prevent the “+++” from being misinterpreted as data, the following sequence should be followed:
1) Do not input any character within 1s or longer before inputting “+++”.
2) Input “+++” within 1s, and no other characters can be inputted during the time.
3) Do not input any character within 1s after “+++” has been inputted.
When AT+QSMTPBODY is executed, the COM port will enter into data mode. All inputted data will be the
body of email. If the inputted data reaches the <body_length> or the time reaches <input_time>, the port
will exit from data mode automatically. If the inputted data is less than the <body_length>, customers can
finish editing body by inputting “+++” or changing DTR level from low to high before <input_time> reaches.
In such case, the COM port cannot reenter data mode by executing ATO command.
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