Product Info

LTE Standard Module Series
EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design 35 / 64
 AT+QCFG="ledmode",0 (Default setting)
 AT+QCFG="ledmode",2
The following tables show the detailed network status indications of the LED_WWAN# signal.
Table 13: Indications of Network Status (AT+QCFG="ledmode",0, Default Setting)
Pin Status Description
Flicker slowly (200ms Low/1800ms High) Network searching
Flicker slowly (1800ms Low/200ms High) Idle
Flicker quickly (125ms Low/125ms High) Data transfer is ongoing
Always Low Voice calling
Table 14: Indications of Network Status (AT+QCFG="ledmode",2)
Pin Status Description
Low Level (Light on) Registered on network
High-impedance (Light off)
 No network coverage or not registered
 W_DISABLE# signal is at low level.
(Disable the RF)
 AT+CFUN=0, AT+CFUN=4
3.8.6. WAKE# Signal
The WAKE# signal is an open collector signal which is similar to RI signal, but a host pull-up resistor and
AT+QCFG="risignaltype","physical" command are required. When a URC returns, a 120ms low level
pulse will be outputted. The state of WAKE# signal is shown as below.
Figure 13: WAKE# Behavior