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http://dx.doi.org/10.5762/KAIS.2018.19.4.642

A Design of A Modbus Application Protocol for Multiple SCU Connections  

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)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.4, 2018 , pp. 642-649 More about this Journal
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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Times Cited By KSCI : 2  (Citation Analysis)
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