User's Manual

CHAPTER THREE - PL3000 BASICS

The device remains in the ‘SystemIdle’ power state for the timeout of the

Suspend timer unless some other activity occurs before that, either system or user

one. If the Suspend timer expires the PM suspends the device.

Note! The above-mentioned particulars of the power states are default

operation of the Windows CE Power Manager (PM). Windows CE also

provides a power management API (an application programming

interface), meaning that an application can demand a given power level

(state), or it can request that the PM does not drop power below a given

level, for example. Further, a Nordic ID MHL

(1)

gives an application the

possibility to control both the keypad and the screen backlights. Therefore,

the above-mentioned particulars just give you some idea of power

management on your device.

(1) The MHL is Nordic ID’s own API formulation for Windows CE devices.

Backup Battery

PL3000 makes it easy for you to handle the situations when the main battery

on your device is running low, and you have a charged spare battery available, for

there is a backup battery on the PL3000. In the same way as the main battery, the

backup one is rechargeable. Being fully charged the backup battery is able to

power the critical electronics of the system for the time to replace the dead or low

battery with a charged spare one. Once you have put the spare battery into the

chamber and closed the cover, the system resumes by pressing the Power button

as if it were normally suspended by the Power button.

The backup battery is charged by means of the main battery. For example,

during the charging of the main battery in its chamber the backup battery is being

charged as well. Be aware that when the main battery is not being charged,

nevertheless it charges the backup battery, if need be.

Charging / Low-battery Indicator

In the keypad area there is a power indicator that is used for showing charging

and battery information on the PL3000. The PL3000 system uses the LED in two

different ways. The dividing line is whether the PL3000 is running on battery or

whether it is on AC.