User manual

22
Status example:
Monitor: off
Lock: off h
the terminal lock condition
Input1: clear h
if this is configured as an output, “input1” is replaced with
“Output:”
Input2: 2.5v-c hthe logical condition is also shown, c for clear, s for set
Missed calls: 13
New SMS: 14
SMS space: 11
Signal: -38dBm
Supply: 12.1v
Supply: break h
this is shown if power was lost after monitoring was started
Temp: 24C
GPS example:
Latitude:
50deg 57.741’N
Longitude:
002deg 19.568’W
Speed: 000.0 kt
Track: 008.0 deg
Var: 004.8deg W
Time: 17:59:10
Date: 30/04/04
The DTM replies with the most recent fix data it received from the GPS receiver
even if the GPS receiver is subsequently switched off. However when power is
removed from the DTM, the last GPS fix is lost and the reply “GPS not
connected or functioning.” is provided. If the GPS is functioning but cannot get a
fix, the reply “No GPS fix available.” is provided.
Section 16
23
Remote commands
Section 16
Remote commands
A powerful and unusual feature is provided where certain facilities may be
controlled remotely by sending an SMS to the terminal.
A GPS receiver connected to the serial port enables the user to determine the
location of the system (see following page).
To operate: send an SMS message to the terminal. The first 4 characters must
be the terminal PIN. This is then followed by the command of your choice.
Example: 1234 status will cause the terminal to give information about its status
to the number that sent the command.
Only the first two characters of the commands are required. The command is not
case sensitive. Example 1234sT
Command list
SET This will set the channel 1 output if it is enabled.
CLEAR This will clear the channel 1 output if is enabled.
ON This will activate input monitoring and lock the terminal.
OFF This will deactivate input monitoring but the terminal will remain locked.
UNLOCK This will deactivate input monitoring if active and unlock the terminal.
LOCK This will lock the terminal.
STATUS This will return the status to the caller:
GPS This will return GPS data if a compatible GPS receiver is connected
and operating.
In all cases the terminal will respond by sending an SMS to the number that sent
the command. The response is either the new status of the terminal or an error
message if the command is not recognised. It is not possible to guarantee that
an SMS message will be delivered immediately. There are rare occasions when
the message will not be sent at all. That is why the terminal always sends a reply
to acknowledge the command and make it clear what state the terminal is in.
Generally the terminal will respond very quickly as most messages are received
without delay.