User Manual

Asset-Link 250 User Manual July 19, 2004

970-00047 Rev. 1.2

Note: GPS receiver can be set to always ON when in Active mode. In this case the

two GPS timer will not take effect in the transition from Active mode to Sleep mode,

i.e., once the Ears-On timer and I/O timer expire, Asset-Link will transition to Sleep

mode.

2.4.2.2 Active Mode

Active Mode, a mode in which digital and analog inputs are monitored continuously;

additionally, one of the radio modules and GPS receiver are on or off (Ears-On and

Ears-Off, GPS On and GPS Off) at times according to actions configured. Note: only

one radio (AMPS or GSM) can be “Ears-On” at a time).

Upon entering this mode from Sleep, the GPS receiver will be turned on and the two

GPS timers – (1) warm-up timer and (2) “max fix” timer, are set according to GPS

parameters configuration.

When entering the Active mode from sleep, based on different triggering activities,

the I/O timer and Ears-On timer are set to count down with different values:

• Triggered by digital input: I/O = 30s

• Triggered by analog input: I/O = 300s

• Triggered by serial port: Ears-On=300s, I/O=300s

• Triggered by schedule or Elapsed timer: I/O = 60s + Sleep wake-up interval

• Triggered by power supply: Ears-On = 300s, I/O =300s

An action can be invoked by an exception during the Active mode to reset the I/O

timer to any value up to 65535 seconds in order to prolong the mode.

If the either LCP port is active, the timer will continuously be set to 5 seconds in

order to let the LCP communication complete.

The Cellular or GSM Ears-On timer can also be set to any value up to 65535 seconds

through an action or a schedule. Once the Ears-On timer expires, the appropriate

radio module will be switched off and the Asset-Link will again return to the “Ears-

Off” sub-mode.

The capability to turn the GPS receiver ON/OFF is also configurable. If the GPS

power control capability is disabled (GPS receiver not allowed to power OFF), then

the GPS receiver is always ON when Asset-Link is in the Active mode. If the max fix

interval capability is enabled, then the GPS receiver is turned ON for a period of time

defined by “warm-up delay timer” and “GPS fix max duration timer” when entering

Active mode. Depending on the settings, when both the two timers countdown to zero

or a GPS fix is obtained, GPS receiver will be shut off. The GPS receiver can also be

shut off any time by an action.

If all the timers -- the two GPS timers, Ears-On and I/O timers, expire in Active

mode, the Asset-Link will transition to Sleep mode. If the GPS receiver is set to be

always ON in Active mode, then only the Ears-On and I/O timers expiration will lead

Asset-Link to transition back to the Sleep mode.