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Automatically Monitoring Energy Resources Using a Data Logger

DataTaker Stand-Alone Solution Remotely Sends Data via FTP

CAS DataLoggers has provided the automated dataTaker data logging solution to a government-owned school building being retrofitted with a solar energy system as part of its renewable energy initiative. The federal department responsible wanted a device in the building to remotely monitor and record their system’s energy generation and usage both to establish the ongoing feasibility of the system and to track their return on investment.

Users needed a data logging system that could log unattended, could read data from smart power meters and solar inverters, and which could also perform remote monitoring and data collection through the school’s hard-wired Internet connection. The department also planned on adding gas flow monitoring to the project so their solution also needed to be compatible with flow sensors.


CAS DataLoggers provided the school building’s solar installation with the Series 3 dataTaker DT82I Data Logger. This smart device has several useful features for this application:

  • A cost-effective data logger designed with the industrial market in mind
  • Up to 6 analog sensor inputs for voltage (±30V), current or resistance inputs
  • The built-in web and FTP server gives users remote access to logged data, configuration and diagnostics
  • Modbus master and slave functionality allows connection to smart devices and SCADA systems via Serial or TCP/IP
  • Two smart serial ports, capable of interfacing to RS232, RS485 and RS422 sensors and modems
  • Rugged construction provides reliable standalone operation even under extreme conditions


  • Solar Inverter with Modbus RS-485
  • Schneider PowerLogic ION6200 Power Meter
  • Pyranometer (measuring Solar Radiation)
  • Gas Flow Sensors


The solar inverter and power meter both communicate using the Modbus RTU protocol over a serial RS-485 link. The inverter reports the energy generated by the solar panels and the power meter reports the energy being used at the facility.

The dataTaker DT82I is the perfect logger for this setup because it features multiple Modbus-compatible serial ports in addition to its analog and digital channels. The dataTaker’s universal inputs will log almost any physical value including voltage, process current, resistance, strain, and frequency. The solar inverter and power meter both network to the same RS-485 serial port and automatically report data according to the dataTaker’s schedule, while the high-accuracy pyranometer is used to help view and document solar panel efficiency.

The low-power DT82I data logger has support for Modbus sensors and SCADA systems, FTP and Web interfaces. This intelligent system features many options to connect locally via USB, RS232 or Ethernet.

Here the school’s technician has left the standalone data logger to log unattended operating on its internal battery. The dataTaker can store up to 10 million expandable data points so users can record as much data as they need. In this application the data logger also automatically transfers its data back to an office via the facility’s hardwired TCP/IP network connection. This was just a simple case of plugging the Ethernet cable into the existing secured router/infrastructure and port forwarding.

Data Logging Software:

Over the Internet connection, the dataTaker can be configured, monitored and accessed 24 hours a day via its internal web-based software (dEX). The logger also automatically backs up new data every day via FTP with minimum setup requirements. This ensures another level of data redundancy.

Solar Logging Benefits:

All in all, the DT82I forms a completely self-contained solution for this green application, connecting to a wide range of sensors for flexible monitoring. The dataTaker provides an extensive array of communications features that include FTP, Modbus/SCADA connection, and more. Each dataTaker data logger also includes the FREE dEX graphical interface software.

In future when gas flow sensors are fitted to the school building, the DT82I will connect to these using its analog or digital counter channels, depending on whether the flow sensors have voltage, 4-20mA current signal or digital pulse outputs.