Users Manual

LTE Standard Module Series
EC200T Series Mini PCIe Hardware Design
EC200T_Series_Mini_PCIe_Hardware_Design 33 / 54
3.10.5. LED_WWAN# Signal
The LED_WWAN# signal of EC200T Series Mini PCIe is used to indicate the network status of the
module, and can absorb a current up to 40mA. According to the following circuit, in order to reduce the
current of the LED, a resistor must be placed in series with the LED.
The LED is emitting light when the LED_WWAN# output signal is low.
Figure 12: LED_WWAN# Signal Reference Circuit Diagram
There are two indication modes for LED_WWAN# signal to indicate network status, which can be
switched through following AT commands:
 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 14: Indications of Network Status (AT+QCFG="ledmode",0, Default Setting)
Table 15: Indications of Network Status (AT+QCFG="ledmode",2)
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
Pin Status Description
Low Level (Light ON) Registered on network successfully
High Impedance (Light OFF)
 No network coverage or not registered
 W_DISABLE# signal is at low level. (Disable RF)