User Manual

Asset-Link 250 User Manual July 19, 2004

970-00047 Rev. 1.2

• GPS (fix updates, constraint regions, constraint groups)

• Cellular module (Standby for CSD connection or MicroBurst® messages

transmission and receiving)

• Check power supply voltage

• Check digital, analog and LCP inputs.

• Data Log and Batch Processor

• Event Monitor and Exception Handler

• Action Scheduler

• Action Processor

A typical exception configuration might be to use a Boolean combination of:

• One digital input connected to engine ignition (key on indicator)

• One analog input connected to oil pressure (engine running indicator)

2.4.3 Power Off Mode

The Power-Off mode is the lowest power consumption mode.

Under most configurations when using Microburst for data communications, it is

advisable that the device be configured to issue a Reverse Control Channel (RECC)

status message before entry into the Power-Off mode. The status message will alert

the host that the client device has entered the Power-Off mode and thus can no longer

receive Forward Control Channel (FOCC) messages. In a usual vehicle application,

the device shall remain in the Power-Off mode until awakened by either detecting the

vehicle’s switched ignition circuit turned on via one of the analog or digital input, or

upon sensing other appropriate “wake-up” activity.

For GSM operations the SMS messages will be stored for the configured period of

time (normally 24 hours).

2.4.4 Connection and Configuration

One challenge remains for the application provider/developer of the Asset-Link

configuration. That is while fulfilling all the necessary application features, reducing

the consumption of asset power (vehicle battery) and backup battery (when installed)

to yet allow the Asset-Link to run and connect to the network for as long as possible.

This can be achieved by a careful design of the transition conditions of operating

modes, which could include I/O inputs, exceptions, schedules etc.

2.5 Power Management

The Power management provides for the powering of all components within the

Asset-Link from the V

_POS and V

_NEG pins on the DB-25 connector. The

supply design is for a 12-volt or 24-volt vehicular system, and this includes: