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4
Operating Modes
The device has three operating modes:
Operating modes
Reset:
Sleep Mode:
Active Mode:
Active Mode:
CAUTION: During USB connection the power consumption of the ADT1 is much higher. USB does not supply or charge
the ADT1
4.1
Measurement Cycle (Active Mode)
During the active mode, the device periodically reads the values of the connected KELLER sensor with sampling period
T
= 30 minutes (default, configurable) and stores the data in the internal EEPROM (RECORD). Therefore, the ADT1
SX
supplies the pressure transmitter and reads the user-selected channels, when the values have been read out the power
supply is switched off again. The device tries automatically to read the values on the I
RS485 Interface (maximum 3 attempts per Interface/sensor), so the user does not have to care about the connected
sensor. Beside these values it is also possible to read out the internal barometer with its pressure and temperature
value with will be saves also in the non-volatile memory. A periodically measurement triggers automatically a transmis-
sion.
After a random delay of 0 ... 6 seconds, the ADT1 sends the measurements. If the device has not joined the LoRaWAN®
network yet, it will try to join until it succeeds (maximum 3 attempts per transmission). Afterwards, it will transmit the
data. In each transmission, two receive slots are opened (RX1 and RX2). During these time slots, the device is ready to
receive data from the network (downlink message).
For each measurement, internal values such as barometer, temperature, humidity, battery voltage and capacity are
also recorded and transmitted as required (see Info message)
NOTE: The lowest sampling period should not be lower than 10min, if you do so it can be, that some packets get lost,
due the airtime limitation of the LoRaWAN® technology (depends on the spreading factor (SF)).
4.2
Sleep Mode
The unit is in a sleep mode; only the real-time clock is active. In this mode the microprocessor wakes up every second
to adjust the time and check if there is an event to react (LED1 is flashing in a 5 second interval).
When the USB interface is connected, the device will automatically switch to active mode (LED flashes every second).
NOTE: The power consumption with connected USB interface is very high and discharge the batterie rapidly.
Version 08/2020
System (re-)start
no measurements and data transmissions; no USB connected
no measurements and data transmissions; USB connected
During periodic measurements (read sensor)
and while data transmission
if transmission failed
www.keller-druck.com
LED1
LED2
5 sec
1 sec
1 sec
1 sec
1 or 5 sec
2
C Interface, if that fails on the
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