ADU-500

Introduction

ADU-500 is an ultra low power, wireless RTU with data logging and alarming capabilities. The battery powered RTU incorporates three digital inputs, two analog inputs, one pulse counter input, battery monitoring, and multiple excitation options for powering measuring transducers. The device supports acquisition of up to 48 measurement channels, based on the popular SDI-12 communication protocol. ADU-500 uses an internal cell modem to automatically send data and alerts. The RTU is available for GSM/EGPRS and LTE network environments. A D-size Lithium Thionyl battery can provide autonomous operation for over 10 years.

The Infinite advantage

The ADU-500 RTU incorporates the common flexible form factor (HL, CF3™) Modem modules from Sierra Wireless. ADU-500 models support NBIoT/LT-M, 4G, 3G, 2G mobile network technology. The 3G and NBIoT/LT-M version of the RTU includes GNSS capability (GPS & Glonass Sirf V).

Measurements & Data Logging

The digital inputs are scanned by the system controller for detecting an alarm condition. Analog input gain, scaling and alarm limits are user definable. The analog inputs and SDI-12 sensors are sampled according to the user defined sampling rate. Sampling rate and sampling duration affect the battery life according to the transducer power supply requirements.

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. ADU-500 is compliant to the SDI-12 Standard Version 1.2 and supports extended commands for sensor configuration, in terminal mode. ADU-500 can collect data from several SDI-12 sensors for a total amount of 48 measurement channels.

RS-485, MODBUS

ADU-500 supports acquisition from sensors with RS-485 interface, using the popular MODBUS ASCII protocol. Up to 10 measurement channels from several sensors are supported.

Transducer excitation

The unit provides multiple excitation options for measuring transducers.

Alerting & messaging

SMS announcements include alert messages and periodical Status messages for verifying unit availability. The unit supports discrete alerting for several users. Message texts are user definable.

Data Transmission

ADU-500 supports periodical data transmission according to user defined parameters. The unit can send data via SMS to predefined users or to an internet server via FTP and data connectivity.

Setup and Remote Configuration

The unit can be programmed locally through the serial port or remotely via SMS by using simple ASCII configuration commands. The command set features commands for configuring input alarm parameters, scaling parameters and alarm limits, timing parameters and defining user groups. ADU-500 can be remotely reconfigured by sending configuration commands to the unit during the periodical status message processing.

Applications

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