How to Read Data from a Modbus RS485 Temperature Sensor

Learn how to take a Modbus RS485 enabled device from scratch and connect it to a Modbus RS485 network

This course as created as a result of requests of students who wanted to have a single example of a Modbus-enabled RS485 device being taken “out of the box” and the steps taken to connect the device onto a Modbus RS485 network where it’s data values could be read and displayed.

What you’ll learn

  • Analyze Modbus device documentation.
  • Analyze RS485 serial communications documentation.
  • Make RS485 serial communications connections.
  • Use software tools to test/verify Modbus register addresses and values.
  • Understand the address offset issue experienced with some Modbus masters.
  • Create a Human Machine Interface to display Modbus data in a user-friendly format.

Course Content

  • Introduction –> 3 lectures • 9min.
  • Downloading the Software Applications –> 3 lectures • 7min.
  • A Look at the Modbus RS485 Temperature/Humidity Sensor –> 3 lectures • 11min.
  • Connecting to the Sensor using Modscan32 –> 3 lectures • 8min.
  • Connecting to the Sensor using Winlog Lite HMI –> 3 lectures • 13min.
  • Bonus Section – How to Always get the Lowest Prices for my Courses –> 1 lecture • 3min.

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Requirements

This course as created as a result of requests of students who wanted to have a single example of a Modbus-enabled RS485 device being taken “out of the box” and the steps taken to connect the device onto a Modbus RS485 network where it’s data values could be read and displayed.

The course uses a Temperature / Humidity sensor that has Modbus RS485 capability, as the device to be connected to the Modbus network. The documentation associated with the device is analyzed and is then used to configure Modbus master test software, where register addresses are confirmed.

The device is connected to a PC via a USB-to-RS485 converter.

After verification of data register addresses, a Human Machine Interface (HMI) application is created using an application called Winlog Lite. The HMI application is then used to read the data values from the Modbus device and display those values in a user-friendly format.

The course is extremely practical and steps he student through the complete process in a very systematic and logical manner. As the software tools are all free trials, the student will be able to download the applications and practice further.

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