SARA-R4/N4 series - System Integration Manual
UBX-16029218 - R11 System description Page 19 of 157
Transition between operating modes
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 unless power saving configuration is
enabled by AT+CPSMS (see the SARA-R4/N4
series AT Commands Manual [2]).
The modules enter active mode from power-off mode when the
host processor implements a clean switch-on procedure by using
the PWR_ON pin (see 1.6.1).
The modules enter active mode from low power deep sleep mode
upon expiration of “Periodic Update Timer” (see 1.13.9), or when the
host processor implements a clean switch-on procedure by using
the PWR_ON pin (see 1.6.1).
The modules enter power-off mode from active mode when the
host processor implements a clean switch-off procedure (see 1.6.2).
The modules automatically switch from active to low power deep
sleep mode whenever possible, if power saving is enabled (see
1.13.9).
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.
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, if power saving configuration is enabled by
the AT+CPSMS command, the module automatically switches to low
power deep sleep mode whenever possible. Vice-versa, the module
wakes up from 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/N4 series modules operating modes description
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