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DE20-BT Industrial DTU | User Manual
16
There is a power terminal on the device. Please leave the HM_GND pin not connected when
powering on the device.
The LED indicators are silk screened as PWR, ERR, 4G and RS232/485.
The definition of the LED indicators is shown below.
LED Indicator
Description
PWR
Solid green: device powered on
ERR
Solid red: device malfunction, hardware error, no SIM card, etc.
4G
Blinking yellow: the 4G network is working
Solid amber: SIM card inserted, wait for the card initializing
RS232/485
Light off
No data receiving or transmitting
RS232 mode
Solid yellow
RS485 mode
Blinking red
Data receiving
Blinking yellow
Data transmitting
Blinking amber
Serial port not functioning properly
GND
PWR
HM_GND
