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Modbus Networking in a Hospital

04-20-2016 05:22 PM CET | Industry, Real Estate & Construction

Press release from: CAS DataLoggers

Modbus Loggers Monitor Temperature

Modbus Loggers Monitor Temperature

Monitoring Freezers for Temperature of Vaccines
CHESTERLAND, OH—April 20, 2016

Recently a hospital required an automated temperature monitoring solution in order to measure and record the temperature of 50 freezers storing temperature-sensitive life science products. These freezers are located throughout the facility on 3 separate floors, but users need centralized access to all the temperature data.

The hospital’s IT department also had a key requirement that they should be able to monitor data using just a single interface, so this necessitated a network setup. Users also needed alarm capability in case the temperature of any freezer should fall outside a specific range. To meet all these needs, the hospital found the ideal solution using dataTaker dataloggers. Read how it was done via Modbus in this latest Apps Note from CAS DataLoggers.

dataTaker Solution:

System Summary:

Three separate dataTaker DT80 units, one installed on each floor, now measure freezer temperatures both directly and via RS485 Modbus ADC devices. The DT80’s are networked via Modbus TCP/IP and can be monitored through a web browser.


• dataTaker DT80 data logger x 3
• DGH D5332M Modbus Expansion Module x 9


T-Type Thermocouples x 50

dataTaker DT80:

1. A cost-effective data logger expandable to 100 channels, 200 isolated or 300 single-ended analog inputs.

2. Built-in web and FTP server allows users to remotely access logged data, configuration and diagnostics.

3. Modbus slave and master functionality allows connection to Modbus sensors and devices and to SCADA systems.

4. Smart serial sensor channels capable of interfacing to RS232, RS485, RS422 and SDI-12 sensors.

5. Rugged design and construction provides reliable operation under extreme conditions.

6. Includes USB memory stick support for easy data and program transfer.


One dataTaker DT80 is installed on each of three separate floors of the hospital. Each DT80 continually monitors the temperature in several freezers located nearby. Two DGH Modbus ADC modules are also connected to each DT80 over a half-duplex RS-485 connection. These modules allow connection of up to four additional thermocouple sensors and make it possible to monitor the distributed freezers located elsewhere on the same floor, minimizing the length of thermocouple wire and reducing cost and signal interference.

The dataTaker units are connected to the hospital’s existing computer network via Ethernet cables. This provides the physical connection for a Modbus TCP/IP network. One of the three DT80 dataloggers acts as a Modbus master, requesting and collecting data from the other two loggers and storing this data in its large internal memory of 10 million data points.

Even though the loggers are using Ethernet for Modbus, they also use this same connection to simultaneously deliver real-time data and generate temperature alarms to users via the internal web server. To access this web server, a user only needs to enter the IP address of the logger into a web browser.

Using this network topology, it’s also possible to save each data point to all of the data loggers for backup purposes. If the hospital needs offsite backup, then the DT80 data loggers can be configured to automatically transfer data to a remote FTP server.

To view features and specifications of our dataTaker dataloggers, or to find the ideal solution for your application-specific needs, contact a CAS Data Logger Applications Specialist at (800) 956-4437 or visit our website at

Contact Information:
CAS DataLoggers, Inc.
8437 Mayfield Rd.
Chesterland, Ohio 44026
(440) 729-2570
(800) 956-4437

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