LEXI-R422 - System integration manual
UBX-23007449 - R02
System description
Page 13 of 108
C1-Public
Mode
Description
Transition between operating modes
Idle
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
).
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 AT commands manual
+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 occurs only after the
complete system wake-up), or upon DTR set to ON (with
AT+UPSV=3 setting).
Active
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
The modules enter active mode from power-off mode when the
host processor implements a clean switch-on procedure by
using the PWR_CTRL pin (see
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_CTRL input pin
(see
).
The modules enter power-off mode from active mode when the
host processor implements a switch-off procedure (see
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 other concurrent
activities are executed.
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.
Connected
RF Tx/Rx data connection is in progress,
with related necessary current consumption
(see sections
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 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: LEXI-R422 modules operating modes description
