User's Manual

© 2016 Connected Holdings LLC 11 / 20
are off. The device would return to full power whenever an event occurs that triggers a report.
Those events include:
 Report timer
 GPIO change
 IP change
 Battery threshold
 Heartbeat
 Watchdog
 Power-up
Any hardware or software reset will return the device to full power mode.
3.5 AT Command
AR-3HU /SR-3HU / S4N-3HU / KT-3HU commands are AT extensions specific to AR-3HU
/SR-3HU / S4N-3HU / KT-3HU devices. They are closely based on commands that are as
similar as possible to other industry common devices and are essentially subsets of standard
AR-3HU /SR-3HU / S4N-3HU / KT-3HU commands. Common commands used with GPRS
modems supporting IP connectivity are not included within the AR-3HU / SR-3HU / S4N-3HU
/ KT-3HU command set extensions. These commands are left in their native structure, as
defined by the respective baseband GSM chip supplier which product already in use.
Command Summary
The following commands are specific to the AR-3HU /SR-3HU / S4N-3HU / KT-3HU. They
are organized by categories.
Event Setting Commands
The following set of commands enables/disables reporting of the various events and state
transitions that take place in the system. The event setting commands typically include trigger(s)
that indicate what event or state transition would cause an event report to be sent. Often state
transitions also qualified with “debounce” time to prevent various flickers and intermittent state
transitions. Examples are: (1) state change of an input pin; (2) crossing a geo-fence line for a
brief period of time and then crossing it back.
As a general rule every event and state transition has its own unique event ID that is reflected
in the report triggered by the said event. Refer to Table 2 – Events for the complete list of event
ID’s. Those default event ID’s can be changed by the user to accommodate specific server
implementations, by explicitly specifying what they are in the respective commands. As an
example, all trip related events can be mapped to the same event ID, so there is no need to parse
the specific event trigger. Following is a list of event setting commands:
1. AT+XBUBE Backup Battery Events
2. AT+XDRI Drive Report Intervals
3. AT+XDTS Drive Trip Start/Stop
4. AT+XGFE Geo-Fence Enable
5. AT+XGPL GPS Lost/Lock