Multi-State Voltage Switching Circuit for RS232 Multiplexing
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Solution Overview
Problem
Existing RS232 communication protocols are limited to point-to-point connections, preventing multiple devices from communicating simultaneously without signal conflicts or the need for additional ports, which is a drawback in applications requiring connectivity between more than two devices.
Innovation Solution
A multi-state voltage switching circuit is used to multiplex RS232 communication between multiple devices, allowing them to connect through a single port by employing a switch with predetermined settings and auto-detect circuitry for seamless communication in both wired and wireless environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RS232 point-to-point communication protocol is used, then communication between two devices is established, but multiple devices cannot communicate simultaneously without signal conflicts
Solution Approach 1:
The patent implements dynamic switching of communication channels using a multi-position switch that can selectively connect different device pairs to the RS232 port. The switch changes states based on which devices need to communicate, allowing multiple devices to share the single port without signal conflicts by ensuring only two devices are active at any given time.
Solution Approach 2:
The system employs periodic detection of device presence and communication requests, using detect signals to determine which devices are connected and need communication. This periodic assessment allows the system to dynamically reconfigure the switch settings to match current communication needs, preventing signal conflicts by coordinating access to the shared RS232 port.
2Adaptability or versatility
If multiple RS232 ports are provided to enable communication between multiple devices, then device connectivity is improved, but cost and complexity increase
Solution Approach 1:
The single RS232 port is designed to serve multiple device connection functions through the switching mechanism. The same physical port can be dynamically assigned to different device pairs (Device A-B, A-C, A-D, etc.) based on communication needs, making the port universal and eliminating the need for multiple dedicated ports while maintaining full connectivity capability.
Solution Approach 2:
The multi-position switch acts as an intermediary between the single RS232 port and multiple devices. It mediates the connection by selectively routing the port's communication signals to appropriate device pairs, enabling multiple devices to access the single port without direct simultaneous connections, thus reducing port requirements while maintaining connectivity.
3Ease of operation
If automatic device detection is implemented, then seamless communication is achieved, but circuit complexity increases
Solution Approach 1:
The system implements self-service through automatic device detection using detect signals. The circuit automatically identifies which devices are connected to the RS232 port and configures the switch settings accordingly without requiring manual intervention. This self-configuring capability achieves seamless communication while keeping the detection circuit relatively simple by leveraging existing signal lines.
Data Source
AI summary
A system and method for the provision of communication across multiple devices in a multiplicity of communication environments, whether in a serial interface environment, or whether used in Bluetooth protocol-based devices, as well as in other communication devices, (ZigBee/WiFi/Wimax, etc.) that normally cannot readily establish such data exchange. The invention accomplishes this through inventive techniques and a circuit that uses multi-state voltage levels to multiplex RS232 communication between at least two, but normally three or more RS232 devices. To this end, the present invention enables a device having RS232 connection between at least two sub-systems, while each sub-system communicates with other external RS232 devices using same RS232 connection between at least two sub-systems.