Design of Smart Module for Industrial Communication Based on MODBUS Protocol

A way using MSP430F149 single-chip and RS-485 bus as the base of its hardware and the standard MODBUS communication protocol to design the universe data-acquisition and communication module was introduced.According to the output of standard analog signals and RS-232 digital signals of the industrial meters,the module can manage the data acquiring from the spot meters by software programming and then transmit them remotely based on MODBUS protocol.A kind of effective isolation measure has been taken in the module,and the module's parameters can be setup by dial switch,key-presses and indicator lights.The application result shows that the whole module has some traits,such as systematic independency,ultralow-power consumption,strong anti-jamming and steady communication.