SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08
Objective Specification
System description
Page 50 of 188
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)
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, the
CTS
output line indicates the power saving state as illustrated in Figure 25,
even with AT+UPSV=2.
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 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 the following cases:
If the module needs to transmit some data over the UART (e.g. URC)
During a CSD data call and a PSD data call with external context activation
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
u-blox AT Commands Manual
The
CTS
output line indicates the UART power saving state as illustrated in Figure 25, if HW flow control
is enabled with AT+UPSV=3.
