Ublox SARA-R5 Series - Page 34

SARA-R5 series - System integration manual
UBX-19041356 - R04 System description Page 34 of 118
C1-Public
The hardware flow control output (CTS line) indicates when the UART interface is enabled (data can
be sent and received over the UART), if HW flow control is enabled, as illustrated in Figure 18.
time [s]
CTS ON
CTS OFF
~9.2 s (default)
Data input
Figure 18: CTS behavior with power saving enabled (AT+UPSV=1) and HW flow control enabled: the CTS output line indicates
when the UART interface of the module is enabled (CTS = ON = low level) or disabled (CTS = OFF = high level)
AT+UPSV=2: power saving enabled and controlled by the RTS line
☞ This configuration can only be enabled with the module hardware flow control disabled by AT&K0
command.
The UART interface is immediately disabled after the DTE sets the RTS line to OFF.
Then, the module automatically enters idle mode whenever possible according to any required activity
related to the network or any other required activity related to the functions / interfaces of the module.
The module automatically enters the deep-sleep mode, according to the +CPSMS / +UCPSMS AT
commands setting, and according to the concurrent activities executed by the module (e.g. GNSS
activities); when the module is in deep-sleep mode, UART is not functional.
The UART is disabled as long as the RTS line is held to OFF, but the UART is enabled in the following
cases:
• If the module needs to transmit some data over the UART (e.g. URC)
• During a PSD data call with external context activation
When an OFF-to-ON transition occurs on the RTS input line, the UART is re-enabled and the module,
if it was in idle mode, switches from idle to active mode after ~15 ms: this is the UART and module
“wake-up time”.
If the RTS line is set to ON by the DTE, then the module is not allowed to enter the idle mode or
deep-sleep mode and the UART is kept enabled until the RTS line is set to OFF.
AT+UPSV=3: power saving enabled and controlled by the DTR line
☞ This configuration can only be enabled with the +USIO variant set to 0 or 1 (single UART interface).
The UART interface is immediately disabled after the DTE sets the DTR line to OFF.
Then, the module automatically enters idle mode whenever possible according to any required activity
related to the network or any other required activity related to the functions / interfaces of the module.
The module automatically enters the deep-sleep mode, according to the +CPSMS / +UCPSMS AT
commands setting, and according to the concurrent activities executed by the module (e.g. GNSS
activities); when the module is in deep-sleep mode, UART is not functional.
The UART is disabled as long as the DTR line is held to OFF, but the UART is enabled in case the
module needs to transmit some data over the UART (e.g. URC).