LISA-U2 series - System integration manual
UBX-13001118 - R27
System description
Page 62 of 183
C1-Public
The different power saving configurations that can be set by the +UPSV AT command are described
in detail in the following subsections. The UART interface communication behaviors for the different
power saving configurations, in relation to the HW flow control settings and
RTS
input line status, are
. For more details on the +UPSV AT command description, see the u-blox AT
AT+UPSV HW flow control
RTS line
DTR line
Communication during idle mode and wake-up
0
Enabled (AT&K3) ON
ON or OFF Data sent by the DTE is correctly received by the module.
Data sent by the module is correctly received by the DTE.
0
Enabled (AT&K3) OFF
ON or OFF Data sent by the DTE should be buffered by the DTE and will be
correctly received by the module when RTS is set to ON.
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).
0
Disabled (AT&K0) ON or OFF ON or OFF Data sent by the DTE is correctly received by the module.
Data sent by the module is correctly received by the DTE if it is ready to
receive data, otherwise the data is lost.
1
Enabled (AT&K3) ON
ON or OFF Data sent by the DTE should be buffered by the DTE and will be
correctly received by the module when active mode is entered.
Data sent by the module is correctly received by the DTE.
1
Enabled (AT&K3) OFF
ON or OFF Data sent by the DTE is buffered by the DTE and will be correctly
received by the module when active mode is entered.
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 or OFF ON or OFF The first character sent by the DTE is lost, but after ~20 ms the UART
and the module are waked up: recognition of subsequent characters is
guaranteed after the complete UART / module wake-up.
Data sent by the module is correctly received by the DTE if it is ready to
receive data, otherwise data is lost.
2
Enabled (AT&K3) ON or OFF ON or OFF Not Applicable: HW flow control cannot be enabled with AT+UPSV=2.
2
Disabled (AT&K0) ON
ON or OFF Data sent by the DTE is correctly received by the module.
Data sent by the module is correctly received by the DTE if it is ready to
receive data, otherwise data is lost.
2
Disabled (AT&K0) OFF
ON or OFF Data sent by the DTE is lost by LISA-U2 modules.
The first character sent by the DTE is lost by LISA-U2 modules, but
after ~20 ms the UART and the module are waked up: recognition of
subsequent characters is guaranteed after the complete UART /
module wake-up.
Data sent by the module is correctly received by the DTE if it is ready to
receive data, otherwise data is lost.
3
Enabled (AT&K3) ON
ON
Data sent by the DTE is correctly received by the module.
Data sent by the module is correctly received by the DTE.
3
Enabled (AT&K3) ON
OFF
Data sent by the DTE is lost by the module.
Data sent by the module is correctly received by the DTE.
3
Enabled (AT&K3) OFF
ON
Data sent by the DTE is correctly received by the module.
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).
3
Enabled (AT&K3) OFF
OFF
Data sent by the DTE is lost by the module.
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).
