User Manual

Asset-Link 250 User Manual July 19, 2004

970-00047 Rev. 1.2

• The conditioning of an external +8 to +36 volt power supply source.

• Over-current protection on the supply inputs.

• Over-voltage and under-voltage protection on the supply inputs.

• Reverse voltage application protection

• Internal +5, 4.2, 3.6, 3.3 and 1.8 volt regulation.

• Power supply voltage sensing to support mode transitions.

• A low current draw in Sleep mode to maintain vehicle batteries.

2.5.1 Power Input Protection

The power inputs are protected with a combination of self-resetting fuse and transient

voltage suppressor (TVS). The self-resetting fuse protects the circuit in the event of

an over current fault caused by reversed voltage or over voltage application, and

allows power re-application when the fault is removed. Refer to the Power Supply

Input section for further details.

External 2 ampere slow-blow fuses, located in series with the +VIN and one

of the two –VIN lines, are recommended to protect the vehicle and the wiring,

and comply with safety standards. The device is protected internally.

2.5.2 MicroBurst™, Control Channel Data

Asset-Link supports MicroBurst

, a “control-channel” technology that provides

simple, reliable, efficient, and economic alternative for wireless data

communications. By using the control channels (FOCC and RECC) in the AMPS

bandwidth, a user can send and receive data. The FOCC uses multiple MINs and the

RECC uses a unique dial number that represents data. The use of the control channels

for data transmission limits the amount of data that can be transported. A SID table is

used for the MicroBurst™ application. The SID table is dynamically updated and

maintained by Aeris Corporation. The Asset-Link meets the Aeris requirements for

MicroBurst

service certification on the initial shipment date. In this mode the

cellular module will only recognized the MicroBurst™ MINs and will not recognize

the circuit switched data’s NAM settings. The nature of the Asset-Link radio design is

such that it will achieve 99.5% or better reception of MicroBurst

messages under

controlled conditions and approximately 96% of messages under real world

conditions.

The following is a preliminary tutorial of MicroBurst™. For more detail information,

please visit the MicroBurst™ developer’s net.

The MicroBurst™ network is made up of five basic component groups:

• Cellular air link and carrier, which provides wireless connectivity from the

Aeris.net™ hub facility out to the MicroBurst™ endpoint devices