User's Manual

being at any given position; the string should be parsed using the comma as a delimiter, and the
desired option retrieved by name. Note that the TM option does not appear in the output string.
<rate> is a value between 1 and 2147483647 (2
31
-1). It will be the number of seconds in
between each message. The default rate for each message type is 60 (once per minute).
Messages for DT, GN, GJ, and GS will not be emitted to the user until the GPS has obtained a
fully resolved fix.
The LG option sets the operating mode for the green LED. The available modes are:
Mode
Description
0
LED is off
1
LED is on
2
LED blinks 1 sec on/1 sec off until GPS fix acquired
3
LED follows GPS 1PPS output
4
LED is on when VHF radio is transmitting
5
LED is on when VHF radio is has received packet
6
LED is on when Tracker is awake (1)
7
LED is heartbeat indicator (50ms on/4950ms off)
(1) - The LED will be lit when the Tracker is awake, in both the user mode and system mode. If
the Tracker is not put to sleep with the $SL command, the LED will remain on. If the Tracker is
put to sleep with the $SL command, the LED will be lit if the Tracker wakes to perform internal
housekeeping tasks.
The LR option sets the operating mode for the red LED. Please see the LG option for the
available modes.
The MD option allows setting whether messages received from the Swarm network are delivered
immediately upon reception, or if they must be polled for by the user via the $RD command.
When MD is set to I, messages are delivered immediately via the unsolicited $RD message.
When MD is set to P, the user periodically needs to issue the $RD command with one of the
appropriate parameters.
38