MTD2000 AT Command Guide R12
Confidential
DAVISCOMMS (S) PTE LTD
2 /105
Revision History
Rev
Date
Author
Description
01
02-Sep-08
CF Chan
Initial release.
02
1-Dec-08
CF Chan
1. Add repeat command, event debug command.
2. Revise standard report format.
3. Revise the setting list in $SC.
4. Rename $NR to $NA since $NR is used for NMEA.
5. Add the maximum length for IP address.
03
30-Apr-09
CF Chan
1. Added panic button and counter command.
2. Added RS232 interface mode command.
3. Added GPS data flag in the event table.
4. Added host name constraints for TCP/IP address.
5. Revised GSM LED definition to follow MC55i.
6. Revised memory logging to overwrite memory data when
memory is full.
7. Revised memory dump to keep the unsent data in the
memory.
8. Revised $EV to support 5 conditions, 10 commands, 250
chars maximum length.
9. Revised the ADC conversion algorithm for external power
and battery power.
10. Removed $NA as heartbeat message is not ready.
11. Removed $PI as debouncing is done via hardware mean.
12. Removed $PO as $OUT will serve the same purpose.
04
08-May-09 CF Chan
1. Revised standard report format to shorten the total length
including device ID to less then 90 chars.
2. Removed ‘;’ as the command terminator for commands
sent via SMS and TCP channel.
05
12-Jun-09
CF Chan
1. Added $ACC for harsh acceleration detection.
2. Added $DEC for harsh deceleration detection.
3. Added $DB to set the data memory size.
4. Revised the default port configuration to 8 input ports.
5. Revised $SS command to place individual GSM/GPS
module to sleep.
6. Revised ADC reference voltage to 3.3V in $XE and $XB
command.
06
03-Jul-09
CF Chan
1. Added $NU to support UDP channel.
2. Added $CR to support cell ID.
07
20-Jul-09
CF Chan
1. Added $ND command for DNS server address.
2. Added watchdog timer to prevent firmware lockup.
3. Monitor and reset GSM and GPS module if it stops
responding.
4. Terminate command response with carriage return and
line feed for TCP channel.
