SARA-G3 series - System Integration Manual
UBX-13000995 - R06
Objective Specification
System description
Page 56 of 218
1.9.1.4
UART and power-saving
The power saving configuration is controlled by the AT+UPSV command (for the complete description, refer
to
u-blox AT Commands Manual [2]). When power saving is enabled, the module automatically enters
low power idle-mode whenever possible, and otherwise the active-mode is maintained by the module (see
section 1.4 for definition and description of module operating modes referred to in this section).
The AT+UPSV command configures both the module power saving and also the UART behavior in relation
to the power saving. The conditions for the module entering idle-mode also depend on the UART power
saving configuration.
Three different power saving configurations can be set by the AT+UPSV command:
AT+UPSV=0, power saving disabled: module forced on active-mode and UART interface enabled
(default)
AT+UPSV=1, power saving enabled: module cyclic active / idle-mode and UART enabled / disabled
AT+UPSV=2, power saving enabled and controlled by the UART
RTS
input line
The different power saving configurations that can be set by the +UPSV AT command are described in
details in the following subsections.
summarizes the UART interface communication
process in the different power saving configurations, in relation with HW flow control settings and
RTS
input line status. For more details on the +UPSV AT command description, refer to
u-blox AT commands
Manual [2].
AT+UPSV
HW flow control
RTS line Communication during idle-mode and wake up
0
Enabled (AT&K3) ON
Data sent by the DTE is correctly received by the module.
0
Enabled (AT&K3) OFF
Data sent by the module is buffered by the module and will be correctly received by
the DTE when it is ready to receive data (i.e.
RTS
line is ON).
0
Disabled
(AT&K0)
ON
Data sent by the DTE is correctly received by the module.
0
Disabled
(AT&K0)
OFF
Data sent by the module is correctly received by the DTE if it is ready to receive
data, otherwise data is lost.
1
Enabled (AT&K3) ON
Data sent by the DTE is buffered by the DTE and will be correctly received by the
module when active-mode is entered.
1
Enabled (AT&K3) OFF
Data sent by the module is buffered by the module and will be correctly received by
the DTE when it is ready to receive data (i.e.
RTS
line will be ON).
1
Disabled
(AT&K0)
ON
The first character sent by the DTE is lost, but it wakes up the UART (if disabled)
and the module (if in idle-mode) after ~20 ms. Recognition of subsequent characters
is guaranteed only after the complete wake-up of the UART and the module (i.e.
after ~20 ms).
1
Disabled
(AT&K0)
OFF
Data sent by the module is correctly received by the DTE if it is ready to receive
data, otherwise data is lost.
