Modbus Communication

Modbus is an industrial communication protocol for reading and writing data from devices (sensors, motors, pumps, programmable logic controllers). It defines how devices send and receive messages over networks. Two flavors: Modbus TCP (over Ethernet, IP networks, modern) and Modbus RTU (over serial RS-485, legacy but widespread). Both work the same way—client reads/writes 16-bit registers on a server device.