RS485 Bus Switch Circuit for Direct Central-to-Slave Communication
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Solution Overview
Problem
In bus communication systems, the central controller can only communicate directly with a master device, requiring signal transmission through the master device to reach slave devices, which occupies more communication resources and results in low efficiency and poor real-time performance.
Innovation Solution
A communication circuit with a master control chip, first and second data bus transceivers, and a switch circuit allows direct communication between the central controller and slave devices via automatic switching of two independent RS485 communication buses, enabling real-time data exchange and direct parameter modification or program updating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the central controller communicates with slave devices through the master device, then the system structure is simple, but the communication efficiency is low and real-time performance is poor
Solution Approach 1:
The communication bus is segmented into multiple independent RS485 buses (first data bus and second data bus), allowing simultaneous communication paths. The first data bus connects the central controller to the master device, while the second data bus directly connects the central controller to slave devices, eliminating the need for all communications to pass through the master device.
Solution Approach 2:
A switch circuit is introduced as an intermediary component to manage communication paths between the central controller, master device, and slave devices. The switch circuit enables automatic switching between different communication buses based on communication requirements, optimizing both system structure and communication efficiency.
2Device complexity
If the central controller communicates with slave devices through the master device, then the communication path is simple, but the signal transmission occupies more communication resources
Solution Approach 1:
The communication resources are segmented into separate physical buses (first data bus and second data bus). By dividing the communication infrastructure into distinct channels, the system can utilize multiple resources simultaneously for different communication tasks, thereby increasing overall resource utilization and reducing the burden on any single communication path.
3Productivity
If automatic switching of communication buses is implemented, then the communication efficiency is improved, but the device complexity increases
Solution Approach 1:
The switch circuit serves as an intermediary that automates the complexity of bus switching. While the switch circuit itself adds some complexity, it eliminates the need for manual configuration and enables efficient automatic path selection based on communication requirements, thereby improving overall communication efficiency without requiring complex control logic throughout the system.
Data Source
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Figure 3~5
AI summary
The present invention relates to the technical field of bus communication, in particular to a communication circuit (100), a communication system (300), and an air conditioning system (400) provided with the communication circuit and the communication system. The communication circuit includes a master control chip (1), a first data bus transceiver (21), a second data bus transceiver (22), and a switch circuit (3). The first data bus transceiver (21) has one end connected to the master control chip (1) and the other end connected to a first external device (401); the second data bus transceiver (22) has one end connected to the master control chip (1) and the other end connected to a second external device (402); and the switch circuit (3) is connected to the first data bus transceiver (21) and the second data bus transceiver (22). The communication circuit can realize automatic switching of two independent RS485 communication buses according to a requirement of communication data, thereby realizing device interconnection and real-time data exchange on the two independent RS485 communication buses. Accordingly, the communication efficiency is improved, facilitating direct parameter modification and program upgrading of a slave device by a central processing unit.