What is Modbus?
where modbus is used
It’s is a communication protocol created by Modicon, a division of Schneider Electric, in 1979 to facilitate communication between different electronic devices, particularly programmable logic controllers (PLCs). It is a serial communication protocol used to transmit information between devices over a network. The device that initiates a request for information is known as the Modbus Client, and the devices that supply the information are known as Modbus Servers. In a typical Modbus network, there is a single client and up to 247 servers, each of which has a unique server address ranging from 1 to 247. The client is also capable of sending information to the servers in addition to requesting it.
It is a communication protocol that enables electronic devices to transmit information over serial lines. It is an open protocol, which means that manufacturers can incorporate it into their equipment without having to pay royalties. Over time, Modbus has become a standard communication protocol in many industries and is now widely used to connect industrial electronic devices.
It is commonly used in instrumentation and control applications where signals from various devices need to be transmitted back to a main controller or data gathering system. For example, in a temperature and humidity monitoring system, sensors and other devices measure the temperature and humidity and transmit the information back to a computer using Modbus.
It is also often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. This is particularly useful in industrial applications where remote monitoring and control are required.
It has several versions that are designed for different types of communication lines. For serial lines, there are two versions: Modbus RTU and Modbus ASCII. Modbus TCP is designed for Ethernet networks. Overall, it has become an essential protocol for industrial communication, allowing devices to seamlessly communicate and work together.