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FIBOCOM FG621-LA Series Hardware Guide
Page 30 of 57
by default, AT commands AT+LEDCFG can switch to pin147 or pin171, table 5-4 is the pin definition.
Table 5-4 Network status indication
Status indicator driven by network status indicator interface is used to describe the network status of the
module. FG621-LA series module network indicator is described as follow table:
Table 5-5 Network indicator light work status
Mode
Module Network Indicator
Pin Level Status
Indicator Light On/Off
Status
Description
1
600ms High / 600ms Low
Quick flashing
600ms on / 600ms off
No SIM card
SIM PIN
Registering network (T<15S)
Register network failed
2
3000ms High / 75ms Low
Slow flashing
3000ms on / 75ms off
Standby
3
75ms High / 75ms Low
Speed flashing
75ms on / 75ms off
Data link established
4
Low
Off
Voice call
5
High
On
Sleep
FG621-LA series modules’ network status indicator reference circuit is shown in the following figure:
Figure 5-8 Network indication light reference circuit
Pin Name
I/O
Pin#
Description
STATUS
DO
171
Network status indicator
NET_MODE
DO
147
Network status indicator(by default)
NET_STATUS
DO
170
Network status indicator
