SARA-R4 series - System integration manual
UBX-16029218 - R20 System description Page 19 of 128
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Transition between operating modes
Module is switched on with application
interfaces temporarily disabled: the module
is temporarily not ready to communicate
with an external device by means of the
application interfaces as configured to
reduce the current consumption (see
section 1.5.1.5).
The modules automatically switch from the active mode to low
power idle mode whenever possible, depending on concurrent
activities executed by the module, upon expiration of the
6 seconds AT inactivity timer (with AT+UPSV=4 setting), or
upon DTR set to OFF (with AT+UPSV=3 setting), if low power
configuration is enabled (see the SARA-R4 series AT commands
manual [2], +UPSV AT command).
When in low power idle mode, the module switches to the active
mode upon data reception over UART serial interface (with
AT+UPSV=4 setting, and in this case the first character
received in low power idle mode wakes up the system, it is not
recognized as valid communication character, and the
recognition of the subsequent characters is guaranteed only
after the complete system wake-up), or upon DTR set to ON
(with AT+UPSV=3 setting).
Module is switched on with application
interfaces enabled or not suspended: the
module is ready to communicate with an
external device by means of the application
interfaces, with related necessary current
consumption (see section 1.5.1.6).
The modules enter active mode from power-off mode when the
host processor implements a clean switch-on procedure by
using the PWR_ON / PWR_CTRL pin (see 1.6.1).
The modules enter active mode from the ultra low power deep
sleep mode upon expiration of the T3412 periodic TAU timer set
by the network, to receive the paging in-between eDRX cycles
according to the timing set by the network, or if the host
processor wakes up the module using the PWR_ON / PWR_CTRL
input pin (see 1.6.1).
The modules enter power-off mode from active mode when the
host processor implements a switch-off procedure (see 1.6.2).
The modules automatically switch from active to ultra low power
deep sleep mode whenever possible, upon expiration of the
T3324 active timer set by the network (depending on +CPSMS
AT command setting), upon expiration of the 6 s AT inactivity
timer (depending on the +UPSV AT command setting), in-
between eDRX cycles when not listening to paging (depending
on the +UPSMVER AT command setting), if no concurrent GNSS
activities are executed (for SARA-R422M8S and SARA-R422S).
The module switches from active to connected mode when a RF
Tx/Rx data connection is initiated or when RF Tx/Rx activity is
required due to a connection previously initiated.
The module switches from connected to active mode when a RF
Tx/Rx data connection is terminated or suspended.
RF Tx/Rx data connection is in progress,
with related necessary current consumption
(see sections 1.5.1.2 and 1.5.1.3).
The module is prepared to accept data
signals from an external device.
When a data connection is initiated, the module enters
connected mode from active mode.
Connected mode is suspended if Tx/Rx data is not in progress.
In such cases the module automatically switches from
connected to active mode and then, depending on the +UPSV,
+CPSMS and +UPSMVER AT commands settings, the module
automatically switches to the low power idle mode and/or to the
ultra low power deep sleep mode whenever possible.
Vice-versa, the module wakes up from low power idle mode
and/or from ultra low power deep sleep mode to active mode and
then connected mode if RF Tx/Rx activity is necessary.
When a data connection is terminated, the module returns to
the active mode.
Table 5: SARA-R4 series modules operating modes description
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