RV-Z50-E Technical Manual
15
4.2.2
Data Reception
How to connect to test service
List of all the ways to receive your data
4.3
Downlink Data (To Z50)
4.4
Communication between Z50s
Brief summary, tech note
4.5
Position Transmission
Position Transmission is enabled by setting either TXRATE or IDLERATE to a nonzero value.
When position transmission is enabled, the device will send its position and other status information
over-the-air automatically, per the configurations below.
4.5.1
Idle Transmission Rate
IDLERATE sets the idle reporting interval. This should be set to the longest acceptable time between
position reports. Conditions (detailed in the following sections) can cause the modem to transmit faster
than the IDLERATE. Set to 0 will disable any idle reporting.
4.5.2
Active Transmission Rate
TXRATE sets the active transmission rate. This is the rate the modem will send its position when one of
the conditions below arises, which can be enabled or disabled individually:
1.
Motion
2.
Distance Traveled
3.
Speed
See the command section for details on how to configure these values.
4.5.3
Report Format
A number of output report formats are available, with the most common being $PRAVE, a customized
format for wireless GPS transponders. See the OUTPUT command for more detail.
4.5.4
Local Position Information
The NMEAOUT, NMEARATE and NMEAMASK commands will configure the unit to output its GPS
position locally over the user serial port.
4.5.5
Deep Sleep
Whenever the TXRATE is greater than 60 seconds, the battery in the SM may be set to turn off the radio
to conserve power. This condition is referred to as the SLEEP state. During this Sleep state, the unit
draws a total of about 1mA, giving a battery life of 2000+ hours.
At the TXRATE interval, the battery will turn the radio back on, allow it to get GPS lock, send its
position/status, and then put the radio back into the Sleep state. This feature is enabled by setting the
TXRATE to a number larger than 60 seconds. It can be completely disabled using the
ATSM
command.
When the unit is in the SLEEP mode, it cannot be put into the Command mode. Turn the unit off and
back on before sending the
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