User's Manual

LTE Module BEC CBRS-12 User Manual
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3.5.1.2. USB Application with USB Remote Wakeup Function
If the host supports USB suspend/resume and remote wakeup function, the following three preconditions
must be met to let the module enter into the sleep mode.
 Keep DTR at high level (pulled up by default).
 Execute AT+QSCLK=1 command to enable the sleep mode.
 The host’s USB bus, which is connected with the module’s USB interface, has entered into suspend
state.
The following figure shows the connection between the module and the host.
USB_VBUS
USB Interface
VDD
USB Interface
Module
Host
GND
GND
Figure 4: Sleep Mode Application with USB Remote Wakeup
 Sending data to BEC CBRS-12 through USB will wake up the module.
 When BEC CBRS-12 has a URC to report, the module will send remote wake-up signals via USB bus
to wake up the host.
3.5.1.3. USB Application with USB Suspend/Resume and RI Function
If the host supports USB suspend/resume, but does not support remote wake-up function, the RI signal is
needed to wake up the host.
There are three preconditions to let the module enter into the sleep mode.
 Keep DTR at high level (pulled up by default).
 Execute AT+QSCLK=1 command to enable the sleep mode.
 The host’s USB bus, which is connected with the module’s USB interface, has entered into suspend
state.
The following figure shows the connection between the module and the host.