LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 32 / 67
3.8.1. RI Signal
The RI signal can be used to wake up the host. When a URC returns, there will be the following behaviors
on the RI pin after executing
AT+QCFG="risignaltype","physical"
.
High
Low
URC returns
120ms
Figure 11: RI Behaviors
3.8.2. DTR Signal
The DTR signal is used for sleep mode control. It is pulled up by default. When module is in sleep mode,
driving it to low level can wake up the module. For more details about the preconditions for module to
enter sleep mode, please refer to
Chapter 3.4.1
.
3.8.3. W_DISABLE# Signal
EC21 Mini PCIe provides a W_DISABLE# signal to disable or enable the RF function (excluding GNSS).
The W_DISABLE# pin is pulled up by default. Its control function for airplane mode is disabled by default,
and
AT+QCFG=“airplanecontrol”,1
can be used to enable the function. Driving it low can make the
module enter airplane mode.
Table 12: Airplane Mode Controlled by Hardware Method
The RF function can also be enabled or disabled through AT commands
AT+CFUN
, and the details are
as follows.
WAKE#
1
OC
Output signal to wake up the host
W_DISABLE#
RF Function Status
Module Operation Mode
High level
RF enabled
Normal mode
Low level
RF disabled
Airplane mode
