Modicon (now Schneider Electric) developed the Modbus protocol in 1979 as a means for communicating with field devices over a single twisted pair wire. Since 2004, Modbus Organization is responsible for the development and update of the protocol. The open and royalty free serial communication protocol continues to be a popular communication standard to transfer discrete/analog I/O information between industrial devices.
Modbus devices operate in a master-slave (client-server) technique, where the master/client communicates with one or multiple slaves/servers. The master typically is a PLC, PC, DCS, or RTU, which initiates a request for data from a slave and only that particular slave/server responds to that query. The slave is any peripheral monitoring or measuring device (I/O transducer, sensors, valve, network drive or other devices).
One of the major advantages of the protocol is that it is open source. This can greatly reduce the need to buy unique chipsets or pay heavy royalty/licensing fees. Healthcare and home automation industries are also exploring the benefits offered by the Modbus protocol stack.
The main reason Modbus is so successful is the fact that non-programmers can readily understand it. Even plant engineers who deal directly with meters, measuring devices, and other industrial assets could easily understand the concept of coils/registers and the simple commands to read and write them. Because of its universal nature, it has a number of benefits including the following:
Before you decide on a Modbus solution, you need to consider various details like the devices that you are going to be monitoring and how they report back to you. Don’t worry about the intricacies of Modbus setup and use as our engineers can effectively put it all together for your real world needs. Considering both the hardware and software limitations and challenges, some of the Modbus protocol services that we offer are as mentioned below.
Technical Specification of Modbus master and slave stacks:
Utthunga’s Modbus stack is running in tens of thousands of systems worldwide. The stack is high performance and low-footprint. We have implemented the stack on desktop, mobile as well as embedded systems of various types. We support all the variants of Modbus, and the stack can be easily integrated into any existing module/system.
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