TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 48 of 158
RI signal behavior
The
RI
module output line is set by default to the OFF state (high level) at UART initialization.
The
RI
output line can notify an SMS arrival. When the SMS arrives, the
RI
line switches from OFF to ON for 1 s
(see Figure 21), if the feature is enabled by the proper AT command (see the
u-blox AT Commands Manual
AT+CNMI command).
Figure 21: RI behavior at SMS arrival
This behavior allows the DTE to stay in power saving mode until the DCE related event requests service.
For SMS arrival, if several events coincidently occur or in quick succession each event independently triggers the
RI
line, although the line will not be deactivated between each event. As a result, the
RI
line may stay to ON for
more than 1 s, so that:
RI
line monitoring cannot be used by the DTE to determine the number of received SMSes.
For multiple events, 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 proper commands.
1.9.2.4
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
[3]). 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 low power idle-mode also depend on the UART power
saving configuration, as the module does not enter the low power idle-mode according to any required activity
related to the network (within or outside an active call) or any other required concurrent activity related to the
functions and interfaces of the module, including the UART interface.
The AT+UPSV command can set these different power saving configurations:
AT+UPSV=0, power saving disabled (default configuration)
AT+UPSV=1, power saving enabled cyclically
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 different power saving configurations that can be set by the +UPSV AT command are described in details in
the following subsections. Table 12 summarizes the UART interface communication process in the different
power saving configurations, in relation with the hardware flow control settings and the
RTS
input line status.
For more details on the +UPSV AT command description, see
u-blox AT commands Manual
SMS arrives
time [s]
0
RI ON
RI OFF
1s
time [s]
0
RI ON
RI OFF
1s
Comment [sses2]:
Not supported by
the "50", “01” and TOBY-L280-00S
product versions