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Technologies - Modbus RS-485

Modbus is a data communications protocol commonly used for connecting industrial electronic devices. Modbus was originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs) in industrial applications. It is often used to connect a supervisory computer with a remote terminal unit (RTU) in Supervisory Control and Data Acquisition (SCADA) systems. 

Compared to other standards, Modbus is relatively easy to deploy and maintain, and places few restrictions on the format of the data to be transmitted. Its popularity is boosted by the fact that it is openly published and royalty-free.  Modbus uses the RS485 or Ethernet as its wiring type, and supports communication to and from multiple devices connected to the same cable or Ethernet network.

RS485 – Recommended Standard-485, also known as TIA-485(-A) or EIA-485, is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported. The standard is jointly published by the Telecommunications Industry Association and Electronic Industries Alliance (TIA/EIA). Digital communications networks implementing the standard can be used effectively over long distances and in electrically noisy environments. Multiple receivers may be connected to such a network in a linear, multidrop bus. These characteristics make RS-485 useful in industrial control systems and similar applications. 

RS485 Wiring

The Go Monitor 4G Hub is capable of supporting both Modbus RS-485 and Modbus TCP/IP. This allows our partners to quickly integrate new devices and data points rapidly, visualising them using the Go Monitor Cloud.

The network can be expanded using a mixture of both technologies to best suit the application, supporting a very high volume of data points in a variety of challenging industrial environments.

Using Modbus RS-485 and Modbus TCP/IP we can integrate class leading 3rd party devices to expand the solution. For example, additional 4-20mA analogue interfaces, relay output modules, or even radio network base stations can be used to create the best possible solution available. Here is an example of a network topology using both Modbus RS-485 and Modbus TCP/IP to create a flexible and powerful solution:


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