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ADS-270 battery powered end node. SDI12 and Modbus

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ADS-270 is an ultra-low power IO-module. SDi-12, Modbus RTU device compatible with

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Artikelnummer: 186
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ADS-270 is an ultra low power, battery powered end node for the LoRa network. The unit is available for the 433MHz, 868MHz and 915MHz bands. It incorporates two inputs, one digital with pulse counter capability and one analog, as well as multiple excitation options for powering transducers. A D-size Lithium Thionyl battery provides autonomous operation for over 10 years.

SDI-12 Serial Bus

SDI-12 is an asynchronous, ASCII, serial communications protocol that was developed for intelligent sensor instruments that typically monitor environmental, structural engineering and precision agriculture data. The communication is achieved by digital communications. The addressing system allows data recorder to communicate with several microprocessor-based sensors over a single line. ADS-270 is compliant to the SDI-12 Standard Version 1.2 and supports extended commands for sensor configuration, in terminal mode. ADS-270 can collect data from several SDI-12 sensors for a total amount of 8 measurement channels.


ADS-270 supports acquisition from sensors with RS-485 interface, using the popular MODBUS protocol (RTU & ASCII). Up to 8 measurement channels from several sensors are supported.

Transducer excitation

The unit provides multiple excitation options for measuring transducers.


  • Weather conditions & environmental monitoring
  • Water/wastewater level & quality
  • Structural engineering
  • Precision Agriculture
  • Smart City
  • Oil & Gas
  • Building Management
  • Factory Automation
  • Power Grid

Ordering Codes

ADS-270-8LoraWAN end node, 868 MHz Band
ADS-270-9LoraWAN End node, 915 MHz Band
ADS-270-4LoraWAN End node, 433 MHz Band


Sensor excitation
Serial Bus features & options
Configurable Input (IN1)
Processing unit
Power supply
Supply voltageInternal: 3.6V, 13Ah Lithium Thionyl battery (Saft LSH-20 recommended)
External: 5 VDC, regulated
Stand by10μA 3.6V
Communication868 MHz Band: Transmit: average 40mA, 915 MHz Band: Transmit: average 122mA, 433 MHz Band: Transmit: average 33mA.
MeasurementUp to 1A at 3.6V (according to sensor supply requirements)
System controllerUltra low power ARM 7 MCU
Configuration memory16 KByte EEPROM
Digital input1, dry contact, 0-30VDC
Pulse counter1, 2KHz.
Analog input1, Range: 0-1V, 12 bit resolution.
SDI-128 channels, up to 3 sensors, Support of extended commands in Terminal mode
RS-485, MODBUS8 channels, up to 3 sensors, MODBUS RTU & ASCII protocol
RS-485Sensors with RS-485 interface and proprietary protocol (OEM versions only)
Output 112VDC/250mA
Output 25VDC/200mA
863-870 MHz BandUplink data rate (TX) up to 300Kbps with FSK modulation, Max output power +14dBm
902-928 MHz BandUplink data rate (TX) up to 300Kbps with FSK modulation, Max output power +18.5 dBm
433.050 MHz to 434.790 MHz BandUplink data rate (TX) up to 300Kbps with FSK modulation, Max output power +10 dBm
Transciever433 MHz Band & 868 MHz Band: RN2483 (Microchip), 915 MHz Band: RN2903 (Microchip)
Antenna connectorSMA Jack
Serial interfaceUSB, up to 115 kBit/s
Temperature-40°…65°C, operating
IndicationsLED, Operation status
Dimensions124 x 79.5 x 70 mm (with cable gland)
ProtectionIP66, IP68
Weight0.3 kg (without battery)