Quectel EG91 Series User Manual

LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design 32 / 106
 AP_READY will detect the sleep state of host (can be configured to high level or low level detection).
Please refer to AT+QCFG="apready" for details.
3.5.1.2. USB Application with USB Remote Wakeup Function
If the host supports USB suspend/resume and remote wakeup functions, the following three preconditions
must be met 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.
 The host’s USB bus, which is connected with the module’s USB interface, enters suspend state.
The following figure shows the connection between the module and the host.
Figure 4: Sleep Mode Application with USB Remote Wakeup
 Sending data to EG91 series module through USB will wake up the module.
 When EG91 series module has a URC to report, the module will send remote wakeup signals via
USB bus so as 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 wakeup function, the RI signal is
needed to wake up the host.
There are three preconditions 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.
 The host’s USB bus, which is connected with the module’s USB interface, enters suspended state.
The following figure shows the connection between the module and the host.

Quectel EG91 Series Specifications

General

Brand	Quectel
Model	EG91 Series
Category	Control Unit
Language	English