HOME UNIT 1 UNIT 2 UNIT 3 UNIT 4 UNIT 5 Modbus Protocol Modbus is a data communication protocol that is based on a request-response model. Previously referred to as a master-slave protocol, the Modbus organization replaced the terms master and slave with server and client in 2020. Modbus is used for transmitting information between devices that are connected to buses or networks over serial lines or Ethernet and, increasingly, using wireless. Modbus is the most widely used network protocol in the industrial manufacturing sector. The most common use case is the communication between a human-machine interface (HMI) or supervisory control and data acquisition (SCADA) system and a sensor, programmab...