MTD2000 AT Command Guide R12
Confidential
DAVISCOMMS (S) PTE LTD
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21.8
GSM Modem – AT$GM.............................................................................................82
21.9
UART Control – AT$UM............................................................................................83
22
Power Status Command...............................................................................................85
22.1
External Power Status – AT$XE ...............................................................................85
22.2
Battery Power Status – AT$XB .................................................................................86
23
Timer and Counter Command ......................................................................................88
23.1
Timer – AT$FT..........................................................................................................88
23.2
Counter – AT$FC......................................................................................................89
24
Event Command...........................................................................................................92
24.1
Event Table...............................................................................................................92
24.2
Event – $EV ..............................................................................................................93
25
Miscellaneous Functions ..............................................................................................96
25.1
GSM Monitoring ........................................................................................................96
25.2
GPS Monitoring.........................................................................................................96
25.3
GPS Antenna Detection ............................................................................................96
25.4
Low Battery Shutdown ..............................................................................................96
25.5
Watchdog Timer........................................................................................................97
25.6
Firmware Upgrade ....................................................................................................97
25.7
Test Mode .................................................................................................................97
26
Appendix ......................................................................................................................98
26.1
NMEA Messages ......................................................................................................98
26.1.1
GLL – Geographic Position (Latitude / Longitude) .............................................98
26.1.2
GGA – Global Positioning System Fix Data.......................................................99
26.1.3
GSA – DOP and Active Satellites ......................................................................99
26.1.4
GSV – Satellites in View ..................................................................................100
26.1.5
VTG – Course Over Ground and Ground Speed .............................................101
26.1.6
RMC – Recommended Minimum Specific GNSS Data....................................101
26.1.7
ZDA – Time and Date ......................................................................................102
26.2
TCP Connection Setup ...........................................................................................104
26.2.1
Connecting from MTD to TCP Server ..............................................................104
26.2.2
Disconnecting TCP Server from MTD..............................................................104
26.3
UDP Connection Setup ...........................................................................................105
26.3.1
Connecting from MTD to UDP Server..............................................................105
26.3.2
Disconnecting UDP Server from MTD .............................................................105