HVAC Controller Interface for BMS Integration
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Solution Overview
Problem
Existing building management systems (BMS) face challenges in integrating non-networked devices, such as valves and actuators, into their networks due to lack of communication protocols and hardware, requiring separate networks or direct user interfaces, which limits control functionality and increases installation complexity.
Innovation Solution
A network interface device with a processing circuit, device interface module, and network interface module that maps data attributes from refrigeration equipment controllers to external networks, enabling communication and control over existing BMS networks using protocols like BACnet, MODBUS, and UART interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-networked devices are integrated into BMS network using separate networks or direct user interfaces, then control functionality is maintained, but device complexity and installation complexity increase
Solution Approach 1:
The network interface device is designed with multi-functionality to communicate with multiple types of devices using different communication protocols (BACnet, MODBUS, UART, etc.). It serves as a universal bridge that can interface with various refrigeration equipment controllers and building management systems, eliminating the need for separate communication networks for different device types.
Solution Approach 2:
The network interface device acts as an intermediary between non-networked refrigeration equipment controllers and the BMS network. It translates and bridges communication between devices that speak different protocols, allowing seamless integration without requiring changes to the existing devices or network infrastructure.
2Adaptability or versatility
If non-networked devices are integrated into BMS network using separate networks or direct user interfaces, then control functionality is maintained, but system management efficiency decreases
Solution Approach 1:
The network interface device serves as an automated intermediary that handles all communication translations and data mappings between non-networked devices and the BMS network. This automation eliminates the need for manual user interface interactions, allowing system managers to control and monitor all devices through a unified network interface, thereby improving system management efficiency.
3Adaptability or versatility
If additional real estate is provided within BMS device for third party devices, then integration capability is improved, but device complexity increases
Solution Approach 1:
The system is segmented into separate functional components: the network interface device handles all communication and protocol translation functions, while the existing BMS controller focuses on control logic. This segmentation allows third-party devices to be integrated without adding complexity to the main controller, as the network interface device independently manages communication tasks.
Solution Approach 2:
The network interface device acts as an intermediary layer between third-party devices and the BMS controller. It handles all communication overhead, protocol translations, and data mappings, allowing the BMS controller to remain simple while still achieving comprehensive integration capability through the intermediary's multi-protocol support.
Data Source
AI summary
A building management system network interface device is provided. The network interface device includes a processing circuit with a device interface module and a network interface module. The device interface module is communicably coupled to a refrigeration equipment controller and includes an equipment object configured to receive data values and to populate attributes of the equipment object with the data values. The network interface module is communicably coupled to the device interface module and an external network, and is configured to map the attributes of the equipment object to individual data objects and to write the attributes of the equipment object to the mapped individual data objects. The processing circuit is also configured to execute control logic to control the operation of the refrigeration equipment controller based on the data values received from the refrigeration equipment controller and commands received from the external network.