Remote Monitoring and Management System of CNG Flow based on Modbus RTU Protocol

Abstract

Abstract—A remote measurement, control and management system of CNG flow is presented based on Modbus RTU communication protocol and non-contact IC card. The system realizes parameter settings, CNG cumulative flow collection, history record inquiry, remote data transmission, real-time display, sound and light alarm with the core chip STC89C516. Both the Coriolis mass flow-meter and the upper computer serially communicate with the microcontroller by the RS485 interface based on Modbus RTU protocol. The non-contact IC card and the password entered by the keyboard are used to modify the system parameters. The strict password protection system is designed to ensure the data security in the IC card. The test results show that the system can smoothly run, safely, accurately and flexibly acquire data, remotely transmit data and display. The system has the advantages of simple operation, high precision, strong anti-interference ability and low circuit cost, which has broad application prospects.