LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
System description
Page 47 of 125
Figure 26: RI behavior during an incoming call
The
RI
line can notify an SMS arrival. When the SMS arrives, the
RI
line switches from OFF to ON for 1 s (see
Figure 27), if the feature is enabled by the proper AT command (refer to
u-blox AT Commands Manual
AT+CNMI command).
Figure 27: RI behavior at SMS arrival
This behavior allows the DTE to remain in power saving mode until the DCE related event requests service.
If more than one SMS arrives coincidently or in quick succession the
RI
line will be independently triggered,
although the line will not be deactivated between each event. As a result, the
RI
line may remain in the ON state
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 can’t be used by the DTE to determine the number of received SMSes
In case of multiple events (incoming call plus SMS received), the
RI
line can’t be used to discriminate
between the two events, but the DTE must rely on the subsequent URCs and interrogate the DCE
with the proper commands
1.9.1.3
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], AT+UPSV command). When power saving is enabled, the module automatically
enters idle-mode whenever possible, otherwise the active-mode is maintained by the module. The AT+UPSV
command sets the module power saving configuration, but also configures the UART behavior in relation to the
power saving configuration. The conditions for the module entering idle-mode also depend on the UART power
saving configuration.
The different power saving configurations that can be set by the AT+UPSV command are described in the
following subchapters and are summarized in Table 17. For more details on the command description, refer to
u-blox AT commands Manual
SMS arrives
time [s]
0
RI ON
RI OFF
1s
SMS
time [s]
0
RI ON
RI OFF
1s
1s
time [s]
15
10
5
0
RI ON
RI OFF
Call incomes
1s
time [s]
15
10
5
0
RI ON
RI OFF
Call incomes
