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SARA-G3 series - System Integration Manual

UBX-13000995 - R06

Objective Specification

System description

Page 25 of 218

Operating Mode

Description

Transition between operating modes

Idle-Mode

The module is not ready to communicate with an
external device by means of the application
interfaces since configured to reduce power
consumption.
The module automatically enters idle-mode whenever
possible if power saving is enabled by the
AT+UPSV command (refer to

u-blox AT Commands

Manual

[2]), reducing power consumption (refer to

1.5.1.3).
The

CTS

output line indicates when the UART

interface is disabled/enabled due to the module
idle/active-mode according to power saving and
hardware flow control settings (refer to 1.9.1.3,
1.9.1.4).
Power saving configuration is not enabled by default:
it can be enabled by the AT+UPSV command (see

u-blox AT Commands Manual

[2]).

A proper 32 kHz signal must be fed to the

EXT32K

pin of SARA-G300 and SARA-G310 modules to let
idle-mode that otherwise cannot be reached (this is
not needed for the other SARA-G3 series
modules).

The module automatically switches from active-mode
to idle-mode whenever possible if power saving is
enabled (refer to sections 1.5.1.3, 1.9.1.4 and to the

u-blox AT Commands Manual

[2], AT+UPSV).

The module wakes up from idle-mode to active-mode
in the following events:



Automatic periodic monitoring of the paging
channel for the paging block reception according
to network conditions (refer to 1.5.1.3, 1.9.1.4)



Automatic periodic enable of the UART interface
to receive and send data, if the power saving
AT command is set to 1 (refer to 1.9.1.4)



RTC alarm occurs (refer to

u-blox AT

Commands Manual

[2], AT+CALA command)



Data received on UART interface (refer to
1.9.1.4)



RTS

input line set to the ON state by the DTE

if hardware flow control has been disabled by
AT&K3 and the power saving AT command is
set to 2 (refer to 1.9.1.4)



GNSS data ready: when the

GPIO3

pin is

informed by the connected u-blox GNSS receiver
that it is ready to send data via the DDC
(I

C) interface (refer to 1.11, 1.9.3)

Active-Mode

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 (refer to
sections 1.5.1.3, 1.9.1.4 and to the

u-blox AT

Commands Manual

[2]).

When the module is switched on by an appropriate
power-on event (refer to 2.2.1), 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 (refer to idle to active
transition description).
When a voice call or a data call is initiated, the
module switches from active-mode to connected-
mode.

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
1.5.1.3, 1.9.1.4 and the

u-blox AT Commands

Manual

[2][2]

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 the active-mode.

Table 5: Module operating modes description

Figure 3Figure 3

describes the transition between the different operating modes.