Modbus protocol definition
THE Modbus is a protocol of communication created to ensure industrial automation . It allows several connected network devices to communicate in order to transmit their results to a third-party computer. This protocol communicates according to an architecture called " master/slave " (or " client/server " for the TCP/IP protocol), which means that only one "master" is connected to the different "slaves" and that it is the only one able to send them queries . This organization makes it simple to set up in addition to making it very reliable.
Main application of Modbus
The protocol Modbus is mainly used for industrial equipment and the programmable automatons . It allows, for example, the system to supervision (master) to retrieve data from a sensor measuring temperature. Its reliability and his simplicity make it very interesting for industrial installations.
The differences between RTU and TCP/IP
The systems Modbus RTU And TCP/IP are similar but use different protocols ( RS-485 , RS-232 And RS-422 for the first and TCP/IP for the second). RTU therefore uses the "master/slave" architecture (one master for several slaves) while TCP/IP uses the "client/server" architecture. There can therefore be several masters in the case of TCP/IP, unlike RTU where the master is unique (the client plays the role of master and the server(s) that of slave).
Modbus RTU therefore offers a centralized management by the "master" and a fast data transfer .
Modbus TCP/IP allows you to have several masters and a compatibility with the Ethernet networks already in place.
Essential Modbus Compatible Products
To integrate Modbus into your system, several product options are available, tailored to various specific needs and requirements:
Modbus modules
Router offering high flexibility and increased reliability for communication systems.