SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 56 of 217
AT+UPSV=2: power saving enabled and controlled by the RTS line
This configuration can only be enabled with the module hardware flow control disabled by AT&K0 command.
The UART interface is immediately disabled after the DTE sets the RTS line to OFF.
Then, the module automatically enters idle mode whenever possible according to any required activity related to
the network or any other required activity related to the functions / interfaces of the module.
The UART is disabled as long as the RTS line is held to OFF, but the UART is enabled in the following cases:
If the module needs to transmit some data over the UART (e.g. URC)
On SARA-G3 modules, during a CSD data call and a PSD data call with external context activation
On SARA-G3 modules, during a voice call
On SARA-G3 modules, if a data is sent by the DTE, it 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 previously set with the AT+UPSV=1 configuration
When an OFF-to-ON transition occurs on the RTS input line, the UART is re-enabled and the module, if it was in
idle mode, switches from idle to active mode after ~20 ms: this is the UART and module “wake up time”.
If the RTS line is set to ON by the DTE the module is not allowed to enter the low power idle mode and the
UART is kept enabled.
On SARA-G3 modules product versions “00” and “01”, the CTS output line indicates the power saving
state as illustrated in Figure 28, even with AT+UPSV=2, while the CTS output line follows the AT+UCTS
command setting on product versions “02” onwards.
AT+UPSV=3: power saving enabled and controlled by the DTR line
The AT+UPSV=3 power saving configuration is not supported by SARA-G3 modules.
The AT+UPSV=3 configuration can be enabled regardless of the flow control setting on UART. In particular, the
HW flow control can be enabled (AT&K3) or disabled (AT&K0) on UART during this configuration.
The UART interface is immediately disabled after the DTE sets the DTR line to OFF.
Then, the module automatically enters idle mode whenever possible according to any required activity related to
the network or any other required activity related to the functions / interfaces of the module.
The UART is disabled as long as the DTR line is set to OFF, but the UART is enabled in case the module needs to
transmit some data over the UART (e.g. URC).
When an OFF-to-ON transition occurs on the DTR input line, the UART is re-enabled and the module, if it was in
idle mode, switches from idle to active mode after 20 ms: this is the UART and module “wake up time”.
If the DTR line is set to ON by the DTE, the module is not allowed to enter idle mode and the UART is kept
enabled until the DTR line is set to OFF.
When the AT+UPSV=3 configuration is enabled, the DTR input line can still be used by the DTE to control the
module behavior according to AT&D command configuration (see the u-blox AT Commands Manual [3]).
The CTS output line indicates the UART power saving state as illustrated in Figure 28, if HW flow control
is enabled with AT+UPSV=3.
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