1.Hangzhou Shallow-Sea Technology Co.,，Ltd.,，Hangzhou 310052，China,； 2.Najing Technology Co.,，Ltd.，Hangzhou 300450,，China,； 3.Aerospace Long March Launch Vehicle Technology Co.，Ltd.,，Beijing 100076,，China
Abstract： Many sensors, terminal equipment and instruments need ultra-low power characteristics and the ability to be connected to the Modbus industrial bus. However, the traditional Modbus communication mechanism is unable to adapt with the low-power mode, resulting in limitation and applicability of ultra-low-power feature devices in industrial field. To solve this problem, a new Modbus protocol processing method was proposed. Through the analysis of the traditional Modbus protocol and the low-power processing mechanism of commonly used device, the information processing mechanism of Modbus protocol was reestablished and modified. Registers were abstracted explicitly and implicitly and were to be linked tightly with the functions and actions of instrument in the communication process, which improved the execution efficiency and the real-time performance of entire device. Test system was built with Modbus host and ultra-low power sensor, and the result shows that the proposed Modbus protocol processing mechanism is able to achieve communication with the host reliably and steadily while maintaining the ultra-low power mode of the sensor.
Key words : Modbus；ultra-low power,；sensor,；bus communication
