Quectel EG91 Series

LTE Standard Module Series
EG91 Series Hardware Design
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Figure 5: Sleep Mode Application with RI
 Sending data to EG91 series module through USB will wake up the module.
 When module has a URC to report, RI signal will wake up the host.
3.5.1.4. USB Application without USB Suspend Function
If the host does not support USB suspend function, USB_VBUS should be disconnected with an external
control circuit to let the module enter sleep mode.
 Execute AT+QSCLK=1 command to enable sleep mode.
 Ensure the DTR is held at high level or keep it open.
 Disconnect USB_VBUS.
The following figure shows the connection between the module and the host.
Figure 6: Sleep Mode Application without Suspend Function
Switching on the power switch to supply power to USB_VBUS will wake up the module.