LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
System description
Page 49 of 125
Every subsequent character received during the active-mode, resets and restarts the timer; hence the active-
mode duration can be extended indefinitely.
The behavior of hardware flow-control output (
CTS
line) during normal module operations with power-saving
and HW flow control enabled (cyclic idle-mode and active-mode) is illustrated in Figure 28.
Figure 28: CTS behavior with power saving enabled: the CTS line indicates when the module is able (CTS = ON = low level) or
not able (CTS = OFF = high level) to accept data from the DTE and communicate through the UART interface
AT+UPSV=2: power saving enabled and controlled by the RTS line
The module behavior is the same as for AT+UPSV=1 case if the
RTS
line is set to OFF by the DTE.
When an OFF-to-ON transition occurs on the
RTS
input line, the module switches from idle-mode to
active-mode after 20 ms and then the module doesn’t enter the idle-mode until the
RTS
input line is held in the
ON state. This configuration can only be enabled with the module HW flow control disabled.
Even if HW flow control is disabled, if the
RTS
line is set to OFF by the DTE, the
CTS
line is set by the
module accordingly to its power saving configuration (like for AT+UPSV=1 with HW flow control
enabled).
When the
RTS
line is set to OFF by the DTE, the timeout to enter idle-mode from the last data received
at the serial port during the active-mode is the one previously set with the AT+UPSV=1 configuration or
it is the default value.
time [s]
CTS ON
CTS OFF
max ~2.1 s
UART disabled
min ~11 ms
UART enabled
~9.2 s (default)
UART enabled
Data input
time [s]
CTS ON
CTS OFF
max ~2.1 s
UART disabled
min ~11 ms
UART enabled
~9.2 s (default)
UART enabled
