EZ consultant’s is providing customized solutions to communicate between intelligent devices. We have successfully emulated Modbus RTU/ASCII protocol and implemented same. EZ is currently developing Modbus TCP/IP protocol.

ez has built customized SCADA software interfacing intelligent device using Modbus or customer specified protocol.

Modbus ® protocol

Modbus Protocol is a messaging structure developed by Modicon in 1979. It is used to establish master-slave communication between intelligent devices. It is a de facto standard, truly open and the most widely used network protocol in the industrial manufacturing environment. It has been implemented by hundreds of vendors on latterly thousands of different devices to transfer and register data between control devices.

Modbus usage

Modbus is used in multiple master-slave applications to monitor and program devices; to communicate between intelligent devices and sensors and instruments; to monitor field devices using PCs and HMIs. Modbus is also an ideal protocol for RTU applications where wireless communication is required. For this reason, it is used in innumerable gas and oil and substation applications.

Modbus TCP/IP protocol

TCP/IP is the common transport protocol of the Internet and is actually a set of layered protocols, providing a reliable data transport mechanism between machines. Ethernet has become the de facto standard of corporate enterprise systems, so it comes as no surprise that it has also become the de facto standard for factory networking. Ethernet is not a new technology. It has matured to the point that the cost of implementing this network solution has been dropping to where its cost is commensurate with those of today's field-buses.

Combining a versatile, scalable, and ubiquitous physical network (Ethernet) with a universal networking standard (TCP/IP) and a vendor-neutral data representation, Modbus gives a truly open, accessible network for exchange of process data. It is simple to implement for any device that supports TCP/IP sockets.

Modbus TCP/IP – Advantages

  • Simplicity: Modbus TCP/IP simply takes the Modbus instruction set and wraps TCP/IP around it.
  • Standard Ethernet: You can use standard PC Ethernet cards to talk to your newly implemented device. Ethernet port 502 is reserved for the Modbus TCP/IP protocol.
  • Open: The Modbus protocol was transferred from Schneider Electric to the Modbus Organization in April 2004, signaling a commitment to openness.
  • Availability of many devices: Interoperability among different vendors' devices and compatibility with a large installed base of Modbus-compatible devices makes Modbus an excellent choice.