SARA-R5 series - System integration manual
UBX-19041356 - R04 System description Page 33 of 118
C1-Public
AT+UPSV=0: power saving disabled, fixed active mode
The module does not enter idle mode and the UART interface is enabled (data can be sent and
received): the CTS line is always held in the ON state after UART initialization. This is the default
configuration.
AT+UPSV=1 or AT+UPSV=4: power saving enabled
When the AT+UPSV=1 command is issued by the DTE, the UART is disabled after the timeout set by
the second parameter of the +UPSV AT command (for more details, see the SARA-R5 series AT
commands manual [2]).
Afterwards, the UART is periodically enabled to receive or send data and, if data has not been received
or sent over the UART, the interface is automatically disabled whenever possible according to the
timeout configured by the second parameter of the +UPSV AT command.
The module automatically enters the idle mode whenever possible but it wakes up to active mode
according to the UART periodic wake-up so that the module cyclically enters the idle mode and the
active mode. Additionally, the module wakes up to active mode according to any required activity
related to the network or any other required activity related to the functions / interfaces of the module.
The module automatically enters the deep-sleep mode, according to the +CPSMS / +UCPSMS AT
commands setting, and according to the concurrent activities executed by the module (e.g. GNSS
activities); when the module is in deep-sleep mode, UART is not functional.
The UART is enabled, and the module does not enter idle mode, in the following cases:
• During the periodic UART wake-up to receive or send data
• If the module needs to transmit some data over the UART (e.g. URC)
• During a PSD data call with external context activation
• If a character is sent by the DTE with HW flow control disabled, the first character sent causes the
system wake-up due to the “wake-up via data reception” feature described in the following
subsection, and the UART will be then kept enabled after the last data received according to the
timeout set by the second parameter of the AT+UPSV=1 command
The module, when not in deep-sleep mode, periodically wakes up from idle mode to active mode to
monitor the paging channel of the current base station (paging block reception), according to DRX
and eDRX specifications, and according to +CEDRXS / +CEDRXRDP AT commands setting. The time
period between two paging receptions is defined by the current base station (i.e. by the network); the
eDRX parameters can be set by the module but are then negotiated with the current base station
(i.e. by the network).
When the module is not registered with a network, the UART is enabled for ~30 ms, and then, if data
has not been received or sent, the UART is disabled for ~31 s, and afterwards the interface is enabled
again.
The module active mode duration depends on:
• Network parameters, related to the time interval for the paging block reception
• Duration of UART enable time in absence of data reception (~30 ms)
• The time period from the last data received at the serial port during the active mode: the module
does not enter idle mode until a timeout expires. The second parameter of the +UPSV AT
command configures this timeout (see the SARA-R5 series AT commands manual [2]).
The active mode duration can be extended indefinitely since every subsequent character, received
during the active mode, resets and restarts the timer.
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