Atlas PT Technical Manual
25
communicate on the default channel. Change the channel frequency to your specific
frequency, and they will be ready to work on your channel.
6.1
Position Transmission
When the ATLAS PT
transmits its position, it also reports other status information such
as voltage, input bits, temperature, velocity, and heading. All of these parameters are
compressed into a short data packet, and sent over the air in the proper TDMA time
slot. Each ATLAS PT
is assigned a time slot, based upon its ID. ID 1 is slot 1, ID 2 is
slot 2…
Position/status reporting can be set to any rate in the range of 30 seconds to 5 minutes.
At the
TXRATE
setting. This is the transmit frequency interval setting. The user
configures
TXRATE
to be shortest acceptable interval between reports. The
factory default is 10 seconds.
At the
IDLERATE
setting. This is the idle reporting interval, usually the longest
acceptable time between position reports.
IDLERATE
is used as a slow-reporting rate for parked vehicles, vehicles that have no
active trigger inputs, no proximity alerts, and that the user has programmed them to
require a minimum movement distance before they will report.
6.2
Set the Transmission Report rate
Using the
TXRATE xx
command to set the report rate, in seconds, for the ATLAS PT
transponder. For example, if you wish the RV-M7 to report every 5 minutes, set the
report rate to 300 seconds (
TXRATE 300
).
If you only want the ATLAS PT
to report position and status when it is moving, set the
TXRATE xx
to the desired time between position transmissions. Then, program the
IDLERATE xx
to the desired number of seconds between reports when the unit is not
moving (idle).
I
MPORTANT
!
: If
IDLERATE
operation is desired, set the minimum distance the unit must
move before a transmission occurs with the
TRIGDX xx
command. If TRIGDX is set to
zero, then the unit will always report at the interval set with the
TXRATE xx
command.
For example, to transmit every 2 minutes when idle, and every 10 seconds when
moving more than 500 meters, use these commands:
IDLERATE 120
(to set the idle moving update interval to 2 minutes.)
TRIGDX 500
(tells it to report at the IDLERATE if it does not move this far)
TXRATE 10
(configures it to report every 10 seconds whenever it is moves more than
TRIGDX meters)
The following diagram illustrates the logic behind the various programmable parameters
that can be used to configure the ATLAS PT
to trigger position transmission. The logic
inside of the ATLAS PT
shown is tested at a user-programmable rate, called the
TXRATE
. The
TXRATE
is the time interval between ATLAS PT
position/status radio
transmissions.
