2009•Journal of Huaqiao UniversityRequires access

Development of Control System for Variable Frequency Converter Based on Modbus Protocol

Hong Jian

Abstract

A designing scheme of controller for variable frequency converter(VFC) based on Modbus protocol is presented since time response of Modbus protocol is weak compared with controller area network-BUS(CAN-bus).The RS-485 communication circuit and program is designed with an emphasis on how to shield the disturbing signal,according to that Modbus protocol for VFD-L series Inverter is need of Network ASCⅡ communication mode.The system provides a hardware-software environment in order to enhance the real-time performance of Modbus protocol in the practical application,in which S3C44B0X is as the kernel,μC/OS-Ⅱ as the operating system,and S3C44B0X processor is combined.

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Key concepts: Modbus, Protocol (science), Embedded system, RS-485, Controller (irrigation), CAN bus, Computer science, Software