Ublox TOBY-R2 Series, System Integration Manual, Page: 45 / 151

TOBY-R2 series - System integration manual
UBX-16010572 - R10 System description Page 45 of 151
The TXD input line is configured to wake up the system via data reception in the following case:
 AT+UPSV=1 is set with HW flow control disabled
Figure 22 and Figure 23 show examples of common scenarios and timing constraints:
 AT+UPSV=1 power saving configuration is active and the timeout from last data received to
idle-mode start is set to 2000 frames (AT+UPSV=1,2000)

Hardware flow control is disabled
Figure 22 shows the case where the module UART is disabled and only a wake-up is forced. In this
scenario the only character sent by the DTE is the wake-up character; as a consequence, the DCE
module UART is disabled when the timeout from last data received expires (2000 frames without data
reception, as the default case).
Wake up character
Not recognized by DCE
OFF
ON
DCE UART is enabled for 2000 GSM frames (~9.2 s)
time
Wake up time: ~20 ms
time
TXD input
UART
OFF
ON
Figure 22: Wake-up via data reception without further communication
Figure 23 shows the case where in addition to the wake-up character further (valid) characters are
sent. The wake up character wakes-up the module UART. The other characters must be sent after
the “wake up time” of ~20 ms. If this condition is satisfied, the module (DCE) recognizes characters.
The module will disable the UART after 2000 GSM frames from the latest data reception.
Wake up character
Not recognized by DCE
Valid characters
Recognized by DCE
DCE UART is enabled for 2000 GSM frames (~9.2s)
after the last data received
time
Wake up time: ~20 ms
time
OFF
ON
TXD input
UART
OFF
ON
Figure 23: Wake-up via data reception with further communication
☞
The “wake-up via data reception” feature cannot be disabled.
☞
In command mode 12 , with “wake-up via data reception” enabled and autobauding enabled, the DTE
should always send a dummy character to the module before the “AT” prefix set at the beginning
of each command line: the first dummy character is ignored if the module is in active-mode, or it
represents the wake-up character if the module is in low power idle-mode.
☞
In command mode 12 , with “wake-up via data reception” enabled and autobauding disabled, the DTE
should always send a dummy “AT” to the module before each command line: the first dummy “AT”
is not ignored if the module is in active-mode (i.e. the module replies “OK”), or it represents the
wake up character if the module is in low power idle-mode (i.e. the module does not reply).
12
See the u-blox AT commands manual [2] for the definition of the interface data mode, command mode and online command
mode.