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A Design of A Modbus Application Protocol for Multiple SCU Connections

다중 제어 장치 연결을 위한 Modbus 응용 Protocol 설계

  • Song, Jeong-Ho (Division of Computer Engineering, Kongju National University) ;
  • Kim, Bo-Hun (Division of Computer Engineering, Kongju National University) ;
  • Kim, Hwang-Rae (Division of Computer Engineering, Kongju National University)
  • 송정호 (공주대학교 컴퓨터공학부) ;
  • 김보헌 (공주대학교 컴퓨터공학부) ;
  • 김황래 (공주대학교 컴퓨터공학부)
  • Received : 2018.01.24
  • Accepted : 2018.04.06
  • Published : 2018.04.30

Abstract

The Modbus protocol is the most widely used protocol for connecting multiple slave control units (SCUs) in the master control unit. However, the Modbus protocol does not identify which SCU response message corresponds to the service request message. Therefore, when using the Modbus protocol, one service request message can be transmitted after processing the previous message. In this paper, we propose a Modbus application protocol with an index code and a service code to solve the problem. As a result of experimentation, it is possible to transmit the next service request message without processing the previous service request message. And when a communications error occurs, it is possible to identify what type of error occurred using an error detection algorithm. Also, with simultaneous multiple service requests, the proposed protocol can improve processing time by about 66.2%, compared to the original Modbus protocol.

Keywords

IoT;Master-Slave Communication;Modbus;Protocol;Remote Control

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