LISA-U2 series - System integration manual
UBX-13001118 - R27
System description
Page 61 of 183
C1-Public
Figure 27: RI behavior at SMS arrival
This behavior allows the DTE to stay in power saving mode until the DCE related event requests
service.
In case of SMS arrival, if several events occur coincidently or in quick succession each event triggers
the
RI
line independently, although the line will not be deactivated between each event. As a result,
the
RI
line may stay ON for more than 1 second.
If an incoming call is answered within less than 1 second (with ATA or if auto-answering is set to
ATS0=1), then the
RI
line will be set to OFF earlier.
As a result:
☞
RI
line monitoring cannot be used by the DTE to determine the number of received SMSs.
☞
In case of multiple events (incoming call plus SMS received), the
RI
line cannot be used to
discriminate the two events, but the DTE must rely on the subsequent URCs and interrogate the
DCE with the appropriate commands.
The
RI
line can additionally notify all the URCs and all the incoming data (PPP, Direct Link, sockets,
FTP) on all LISA-U2 series
modules except for the “01” product version, if the feature is enabled by
the proper AT command (see the u-blox AT commands manual
, AT+URING command): the
RI
line
is asserted when one of the configured events occur and it remains asserted for 1 second unless
another configured event will happen, with the same behavior described in
1.9.2.3
UART and power-saving
The power saving configuration is controlled by the AT+UPSV command (for the complete description
see the u-blox AT commands manual
). When power saving is enabled, the module automatically
enters low-power idle mode whenever possible; otherwise the active mode is maintained by the
module (see section
for the definition and description of module operating modes).
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.
The AT+UPSV command can set these different power saving configurations:
•
AT+UPSV=0, power saving disabled: module forced to 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
•
AT+UPSV=3, power saving enabled and controlled by the UART
DTR
input line
☞
The AT+UPSV=3 power saving configuration is not supported by the “01” product version.
SMS arrives
time [s]
0
RI ON
RI OFF
1s
SMS
time [s]
0
RI ON
RI OFF
1s
