Modbus Command Buffers for Faster Secure Device Communication
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Solution Overview
Problem
Conventional Modbus communication protocols in heat trace systems suffer from slow data transmission rates, unreliable connections, lack of encryption and authentication, and require complex management systems to handle varying device configurations, leading to potential errors and inefficiencies.
Innovation Solution
Implement a command/response protocol that uses high-level commands communicated through contiguous arrays of Modbus registers, incorporating encryption and authentication, to enhance data transmission efficiency and security while maintaining compatibility with existing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional Modbus communication protocols are used in heat trace systems, then device compatibility and simplicity are maintained, but data transmission speed is slow and wire traffic is high
Solution Approach 1:
The patent segments the communication protocol into distinct layers: transport layer (handling Modbus packet transmission) and application layer (handling command/response processing). This segmentation allows the system to use simple Modbus packets for communication while implementing sophisticated high-level command protocols, thereby increasing data transmission speed without overwhelming device complexity.
Solution Approach 2:
The patent introduces an intermediary command/response protocol that sits between the physical Modbus communication layer and the application layer. This intermediary layer translates high-level commands into Modbus register operations, enabling faster data transmission while maintaining compatibility with existing Modbus devices, thus resolving the contradiction between speed and complexity.
2Reliability
If conventional Modbus protocols are used without encryption, then communication simplicity is maintained, but security and reliability are compromised
Solution Approach 1:
The patent implements preliminary action by establishing encryption and authentication mechanisms before actual data transmission occurs. Session keys are generated and exchanged in advance, and device identities are authenticated before command/response exchanges begin. This preliminary security setup ensures reliable secure communication while keeping the actual command protocol simple and efficient.
3Adaptability or versatility
If management systems handle varying device configurations individually, then device adaptability is achieved, but system complexity and potential errors increase
Solution Approach 1:
The patent creates a universal command/response protocol that can handle various device configurations through a standardized interface. High-level commands are designed to be device-agnostic, working across different heat trace devices without requiring custom management system code. This universality maintains adaptability while significantly reducing management system complexity and potential errors.
4Productivity
If standard Modbus register access is used for each command, then protocol simplicity is maintained, but wire traffic increases and transmission efficiency decreases
Solution Approach 1:
The patent merges multiple individual Modbus register operations into single high-level command packets. Instead of sending separate Modbus commands for each data request, the system consolidates multiple operations into unified command/response exchanges. This merging dramatically reduces wire traffic volume and increases data transmission efficiency while maintaining full functionality.
Data Source
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AI summary
Systems and methods for communication between a management system (20) and a plurality of devices (18, 19) over a communication line (23) are provided. One method includes the management system generating a Modbus packet (46) comprising a block write command to a first contiguous array of registers of a device of the plurality of devices, collectively designated as a command buffer (42), where the block write command corresponds to a request for the device to perform an action, and a block read command to a second contiguous array of registers of the device, collectively designated as a response buffer (44). The method also includes the management system transmitting the Modbus packet over the communication line to the device and receiving data from the response buffer in response to the block read command, where the data is written into the response buffer by the device based on the request.