SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 23 of 217
Transition between operating modes
The module is ready to communicate with an
external device by means of the application
interfaces unless power saving configuration is
enabled by the AT+UPSV command (see
sections 1.5.1.4, 1.9.1.4 and the u-blox AT
Commands Manual [3]).
When the module is switched on by an appropriate power-on event
(see 2.3.1), the module enters active mode from not-powered or
power-off mode.
If power saving configuration is enabled by the AT+UPSV command,
the module automatically switches from active to idle mode whenever
possible and the module wakes up from idle to active mode in the
events listed above (see idle to active transition description).
When a voice call or a data call is initiated, the module switches from
active mode to connected mode.
A voice call or a data call is in progress.
The module is ready to communicate with an
external device by means of the application
interfaces unless power saving configuration is
enabled by the AT+UPSV command (see
sections 1.5.1.4, 1.9.1.4 and the u-blox AT
Commands Manual [3]).
When a voice call or a data call is initiated, the module enters
connected mode from active mode.
When a voice call or a data call is terminated, the module returns to
active mode.
Table 5: Module operating mode descriptions
Figure 6 describes the transition between the different operating modes.
Switch ON:
• Apply VCC
If power saving is enabled
and there is no activity for
a defined time interval
Any wake-up event described
in the module operating
modes summary table above
Incoming/outgoing call or
other dedicated device
network communication
No RF Tx/Rx in progress,
Call terminated,
Communication dropped
Remove VCC
Switch ON:
• PWR_ON
• RTC alarm
• RESET_N
(SARA-U2)
Not
powered
Power off
ActiveConnected Idle
Switch OFF:
• AT+CPWROFF
• PWR_ON
(SARA-U2)
Figure 6: Operating mode transitions
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