Modbus Command Buffers for Secure EHT Controller Communication
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Solution Overview
Problem
Conventional Modbus communication protocols in heat trace systems face issues with slow data transmission rates, unreliable connections, lack of encryption and authentication, and complex management system requirements due to varying EHT controller configurations, leading to potential mal-configurations and inefficient data handling.
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 interoperability with existing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional Modbus communication protocols are used for data transmission between management system and EHT controllers, then interoperability with existing devices is maintained, but data transmission rate is slow and wire traffic is excessive
Solution Approach 1:
The patent segments data transmission into structured packets with specific formats including command packets and response packets. Each packet contains optimized fields for address, function, data, and error handling, reducing redundant communication overhead and improving transmission efficiency across the Modbus network.
Solution Approach 2:
The patent changes communication parameters by implementing a streamlined packet structure with optimized data fields. The protocol uses compact binary formats for transmitting control commands and sensor data, reducing the number of bytes transmitted per communication cycle compared to conventional Modbus implementations.
2Reliability
If conventional Modbus protocols without encryption are used, then device compatibility is maintained, but system security is compromised
Solution Approach 1:
The patent introduces an intermediary security layer that operates transparently between the management system and EHT controllers. This layer implements authentication and encryption protocols while maintaining compatibility with standard Modbus communication, allowing secure communication without requiring hardware changes to existing devices.
Solution Approach 2:
The patent creates a universal communication protocol that combines standard Modbus compatibility with enhanced security features. The protocol can operate in both secure and non-secure modes, allowing it to work with a wide range of devices while providing optional security enhancements for protected applications.
3Ease of operation
If management system handles varying EHT controller configurations individually, then device-specific requirements are met, but system complexity increases
Solution Approach 1:
The patent implements a universal command structure that can handle multiple EHT controller configurations through a standardized interface. The protocol uses function codes and data fields that can accommodate different controller types, sensor configurations, and operational modes without requiring separate management logic for each device variant.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where the management system can adapt to different EHT controller types through automated parameter negotiation and configuration. The protocol allows devices to advertise their capabilities and the management system to dynamically adjust communication parameters, reducing the need for manual configuration and lowering system complexity.
4Productivity
If individual register access is used for command and response data, then device control precision is maintained, but communication efficiency decreases
Solution Approach 1:
The patent merges multiple individual register accesses into consolidated packet-based communication. Command packets can transmit multiple control parameters in a single transmission, and response packets can return multiple sensor readings simultaneously, reducing the number of communication cycles required and improving overall data handling efficiency.
Data Source
AI summary
Systems and methods for communication between a management system and a plurality of devices over a communication line are provided. One method includes the management system generating a Modbus packet 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, 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. 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.