| Industrial
IoT
18
LED indicators
The NTC-100 serial modem uses two LEDs to display the current system and
connection status.
Status LED
Status
Description
Off
The power is off.
Flashing Red
Device error.
Flashing Green
The NTC-100 is powering up.
Solid Green
The NTC-100 is powered up and ready for connection.
Network LED
Functions
Status
Description
Off
No signal.
Intermittently Red (on 30
seconds, off 30 seconds)
No SIM detected.
Blinking Red (displays red
once every 2 seconds)
SIM detected but not connected.
Blinking Red, Amber or
Green
Registered to network with poor (red), medium
(amber) or strong (green) signal strength.
Flashing Red, Amber or
Green
Data being transferred with poor (red), medium
(amber) or strong (green) signal strength.
