Network Status Indication - Quectel EC21 Series Hardware Design

3.14. Network Status Indication

The network indication pins can be used to drive network status indication LEDs. The module provides
two pins which are NET_MODE and NET_STATUS. The following tables describe the pin definition and
logic level changes in different network status.
Table 17: Pin Definition of Network Connection Status/Activity Indicator
Pin Name Pin No.
1)
NET_MODE 5
NET_STATUS 6
NOTE
1)
means that this pin cannot be pulled up before startup.
Table 18: Working State of Network Connection Status/Activity Indicator
Pin Name Logic Level Changes
Always High
NET_MODE
Always Low
Flicker slowly (200ms High/1800ms Low)
Flicker slowly (1800ms High/200ms Low)
NET_STATUS
Flicker quickly (125ms High/125ms Low)
Always High
A reference circuit is shown in the following figure.
EC21_Hardware_Design
I/O Description
Indicate the module's network registration
DO
status
Indicate the module's network activity
DO
status
Confidential / Released
LTE Module Series
EC21 Hardware Design
Comment
1.8V power domain
Network Status
Registered on LTE network
Others
Network searching
Idle
Data transfer is ongoing
Voice calling
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