MTD2000 AT Command Guide R12
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4
AT Command Syntax
The MTD AT commands are accessible via serial port, SMS and TCP / UDP channel.
The maximum length of AT commands including the overhead is 120 characters. The
default settings of serial port are as follows: 115200 bps, 8 data bits, no parity bit, 1 stop
bit, hardware flow control. Upon power, the device will send out “MTD2000 READY” to
the serial port using the serial port setting.
The MTD AT command has the prefix of “AT$” or “at$” and is not case sensitive in both
the command and the parameters.
Note 1:
All settings via MTD AT commands (command with prefix “AT$”) are saved into the
flash at the point of entry.
Note 2:
The native GSM/GPRS AT commands (command with prefix “AT+” and “AT^”) will be
routed to the GSM module for handling and the corresponding response will be sent
back to the host via serial port. The GSM/GPRS AT commands are only available via
serial port.
4.1 AT Command
Serial Port
The "AT" or "at" prefix must be set at the beginning of each command line. To terminate
a command line enter <CR><LF>. Commands are usually followed by a response that
includes "<CR><LF><response><CR><LF>". Throughout this document, only the
responses are presented, <CR><LF> are omitted intentionally.
Single AT command can be sent to the device via serial port using the following format:
Syntax
Example
<AT$Command><CR><LF>
AT$SV
SMS and TCP / UDP Channel
Single AT command can be sent to the device via SMS and TCP / UDP channel using
the following format without the “AT” or “at” prefix:
Syntax
Example
<$Command>
$SV
