What is Modbus actually?
Modbus is a communication protocol that can be used to exchange data between a master and several slaves. The protocol was developed by Gould-Modicon in 1979 to enable programmable logic controllers to communicate with each other. Instead of complex, star-shaped wiring, the Modbus protocol enables a simpler and more resource-efficient installation.
How does Modbus work?
Modbus enables a central client, such as a building management system (BMS), and several servers, for example measurement and control systems (sensors), to communicate with each other. This connection can be established via Ethernet as well as via serial interfaces such as RS232 or RS485.
Wireless transmission is also possible via Wireless Modbus/ W-Modbus. With this program S+S Regeltechnik is the first manufacturer in the building automation and sensor technology sector to offer this program. In communication via Modbus, all participants must have a unique address. Communication is normally initiated by the client / building management system, and the addressed server / sensor responds.
Modbus supports various operating modes, including Modbus RTU, Modbus ASCII and Modbus TCP.
What are the advantages of Modbus?
- Very good scalability
- Cost reduction through simple installation
- No license costs
- Modbus makes it possible to link devices from different manufacturers
- Flexible replacement or expansion
- Simple integration into an existing network
- Quick and easy troubleshooting
- Individual settings possible for each device