Sokkia RADIAN IS, Operation Manual

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Using the Radian IS Chapter 4
RADIAN™IS 29
Radian IS detects COM port activity or if the power button is
pressed. If either happens, the Radian IS will automatically turn
back on.
4.1.3 Scheduled session
If the Radian IS is off, but you scheduled a session for logging,
the receiver will indicate that it is aware of the schedule by
slowly flashing the bottom LED of the occupation time gauge.
For more information on the occupation time gauge, see Section
4.2.3.4, Occupation time gauge, on Page 38.
To better understand this concept, you should know that the
reason the GPS receiver can turn off between data-collection
sessions is because of a powerful clock, synchronized to GPS
time, located inside the Radian IS (see Real-Time Clock, on Page
52). This clock acts like an alarm to wake the Radian IS (in other
words, turn it back on) five minutes before a schedule is to
begin.
4.1.4 Data logging interruption
If you press the power button to turn the Radian IS off while it
is logging data autonomously, the Radian IS will save any open
data files before turning off.
4.1.5 Power source
The Radian IS incorporates two internal Sokkia Li-Ion batteries
(or equivalent). For information on the batteries, see Section
3.2.3, Battery, on Page 20. The Radian IS can also be powered
using an external power source such as a car battery. For
information on the external power source, see Section 3.3.1,
Power Port and Power Input, on Page 24.
The Radian IS provides power to peripheral devices through its
COM ports. For more information on output peripherals, see
Section 3.3.2, Communications Ports and Power Output, on Page
24.