LTE Standard Module Series
EC20 R2.1 Mini PCIe Hardware Design
EC20_R2.1_Mini_PCIe_Hardware_Design 28 / 51
3.10.2. 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
.
3.10.3. W_DISABLE# Signal
EC20 R2.1 Mini PCIe provides a W_DISABLE# signal to disable or enable the RF function (GNSS not
included). 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 to low level
can make the module enter airplane mode.
Table 13: Airplane Mode Controlled by Hardware Method
Software method can be controlled by
AT+CFUN
, and has the same effect with W_DISABLE# signal
function, the details are as follows.
Table 14: Airplane Mode Controlled by Software Method
3.10.4. PERST# Signal
The PERST# signal can be used to force a hardware reset on the card. Customers can reset the module
by driving PERST# signal low for 150ms~460 and then releasing it. The reset scenario is illustrated in the
following figure.
W_DISABLE#
RF Function Status
Module Operation Mode
High level
RF enabled
Normal mode
Low level
RF disabled
Airplane mode
AT+CFUN=?
RF Function Status
Module Operation Mode
0
RF and (U)SIM disabled
Minimum functionality mode
1
RF enabled
Normal mode
4
RF disabled
Airplane mode
