MTD2000 AT Command Guide R12
Confidential
DAVISCOMMS (S) PTE LTD
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<CR><LF>
Note: Response without device ID.
<CR><LF><$Command>: <Parameter 1>,…,<Parameter n>;
<Device ID><CR><LF>
Note: Response with device ID.
$SL: 1,”91234567”;ABC1234D
4.5.2
Unsolicited Response
When the device is unable to execute the command successfully or has status update,
it will send out unsolicited response for error and status indication via the selected
channels (serial port, SMS or TCP / UDP channel).
The unsolicited response will be terminated by carriage return and line feed
(<CR><LF>) if the channel is serial port or TCP channel (no carriage return and line
feed for SMS channel).
For example, if the user is trying to establish another TCP / UDP connection without
closing the existing TCP / UDP connection first, the device will send out an unsolicited
response to indicate network connection not allowed.
Syntax
Example
<CR><LF>$MTD: <System Code><CR><LF>
$MTD: 5201
4.6 Command Interface
The command can be sent to the device via:
1.
RS232 Serial Port
2.
Over the air via SMS (GSM)
3.
Over the air via TCP / UDP channel (GPRS)
Notes:
Only MTD2000 AT commands (command with prefix “AT$”) are allowed in SMS and
TCP / UDP channel.
