User Manual

Asset-Link 250 User Manual July 19, 2004

970-00047 Rev. 1.2

I/O timer Configurable between 2 s to 65535 s

Ears-On Timer Configurable between 2 s to 65535 s

GPS warm-up timer Configurable between 0 to 255s

GPS fix duration timer Configurable between 0 to 65535s

I/O inputs poll rate (Power off mode) Configurable 2 to 63 s

Note: nominal supply voltage range should be 8-36V DC.

2.4.2.1 FCP Sleep Mode Operation

In the Sleep Mode, the only section doing any processing is the Real Time Clock

(RTC). The processor periodically enters the “Activity Check” state from the Sleep

Mode. The interval for entry to the Activity Check state is configurable from 2 to 63

seconds and it is recommended 10-30s is used. In this mode the total power

consumption is nominally about 35uA.

In addition to the RTC, the I/O controller hardware is able to detect changes

(interrupts) on the serial port on the 25 pin connector (pin 9), three of the eight digital

GPIOs (GPIO 1, 2 & 3 – pins 2,15 & 3, respectively) and on the supply. The Asset-

Link can be made to enter “Activity Check” sub-mode with activity on these lines.

When doing the Activity Check, the four analog inputs, the power supply voltage;

and the Schedules and Elapsed timers are also checked. If any of these activities have

events that require processing, the Asset-Link will transition to Active mode.

When the Asset-Link enters Active mode, the two GPS timers, the ears-on timer and

the I/O timer are set, according to the configuration and the trigger, and begin to

count down to the time when Sleep mode will be entered.

Under most configurations when using SMS for data communications, it is advisable

that the device be configured to issue a 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 respond. Many applications do the same for

entry into the Sleep mode, this alerts the service provider that the device can no

longer receive messages. In a usual vehicle application, the device shall remain in the

Sleep mode until awakened by either detecting the vehicle’s switched ignition circuit

turned on via one of the analog input, or upon sensing appropriate “wake-up” activity

on one of the three ‘wake’ digital GPIOs.

The following functions are disabled while the FCP is in the Sleep mode:

• GPS Receiver

• Cellular and GSM module

• Data Log and Batch Processor

• Timer (except elapsed timer) and Exception Handler

• Action Processor