Automation, Controls and Technology News — modbus

Modbus Protocol Explained The Modbus protocol works on a master/slave communication template (also often called the client/server model in modern networks). This means only the master (client) can request data, and typically, the PLC or automation controller is the master (client) in the network. The master device can choose to broadcast messages or directly address devices on the network, and the slave devices can respond to directly addressed messages only. The slave devices can also perform actions based on the messages received from the master device. Each message will have an address, a function code, a data register, and a cyclic redundancy...