Unified RS485 and Wiegand Controller Interface
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Solution Overview
Problem
Current systems require separate RS485 and Wiegand interfaces at both controllers and user connectors, leading to increased complexity and cost, and necessitate the use of a switch for signal synchronization, which complicates communication.
Innovation Solution
A controller with an RS485 transceiver and Wiegand interface, utilizing a first logic circuit to determine whether the RS485 data signal should be read as a Wiegand data signal, allowing for the same connector pins to be used for both interfaces without the need for a switch, simplifying communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate RS485 and Wiegand interfaces are used at both controllers and user connectors, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines RS485 and Wiegand interfaces into a single unified interface at the user connector. The controller includes an RS485 transceiver with two input ports that can read both RS485 data signals and Wiegand data signals through the same physical connector, eliminating the need for separate interfaces while maintaining communication reliability through protocol-specific processing.
Solution Approach 2:
The unified interface is designed to support multiple communication protocols (both RS485 and Wiegand) through a single connector. The controller can selectively read data signals from the two input ports based on the detected protocol type, making the interface universal and adaptable to different communication standards without requiring separate dedicated interfaces.
2Adaptability or versatility
If a switch is placed between the user connector and controller for signal synchronization, then interface adaptability is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical switch with an electronic detection and selection mechanism. Instead of using a physical switch to route signals, the controller electronically detects the protocol type through the two input ports and selectively processes RS485 or Wiegand data signals through software-controlled reading operations, eliminating mechanical moving parts while maintaining interface adaptability.
3Reliability
If dedicated connectors are used for all different interfaces, then communication reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple dedicated connectors into a single unified connector that supports both RS485 and Wiegand interfaces. By consolidating the physical connection points into one connector with two input ports at the controller, the manufacturing cost is reduced while communication reliability is maintained through protocol-specific signal processing.
Data Source
AI summary
A controller for reading both an RS485 data signal and a Wiegand data signal from a user connector having two output ports. The controller comprises an RS485 transceiver with two input ports, each of which is connected to a respective one of the two output ports of the user connector or reading one data signal on each of the output ports from the user connector, and an output port for providing an RS485 data signal that is defined by the data signals read on the two output ports. The controller comprises an RS485 interface for receiving the RS485 data signal, and a Wiegand interface for receiving the RS485 data signal and a data ready port connected to the two input ports via a first logic circuit for determining whether the RS485 data signal is to be read as a Wiegand data signal or not on the Wiegand data port.