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FIBOCOM NL668-AM Hardware User Manual
Page 36 of 62
Figure 3-15 UART Level Translate Reference Circuit 2
Note:
This level translate circuit is not suitable for applications with baud rates above 460Kbps.
3.7 Status Indicator
NL668-AM provides three network indication pins (Pin 5 is network status indicator by default, AT
commands AT+LEDCFG can switch to pin 6 or pin 61).
PIN Name
I/O
PIN Num.
Description
NET_MODE
O
5
Network status indicator
NET_STATUS
O
6
Reserved
STATUS
O
61
Reserved
Table 3-15 Network Indication pins
3.7.1 NET_MODE Signal
NL668-AM module network indicator status description.
Mode
NET_MODE
Description
1
Flash (600ms High/600ms Low)
No SIM card
Request SIM PIN
Registering network (T<15S)
Register network failed
2
Slow flash (75ms Low /3000ms High)
Standby
