Fujitsu manual Using the Point 1600 Pen Tablet

Your system may be configured to transition between these states automatically after a period of inactivity to conserve battery power.

To determine the current system state, observe the Power LED. Table 1-1 on page 1-5 gives the different system states represented by the Power LED. (Note that if the Power LED is off, the Off state is indicated.)

2-2 Using the Point 1600 Pen Tablet