Communication device and method for expanding multiple RS485 serial ports through SPI port

By using the CH9434 module and independent power supply circuit, each RS485 serial port is provided with an independent configuration register and buffer. Combined with SPI instruction control, the reliability and real-time issues of concurrent communication of multiple RS485 serial ports are solved, the system power consumption and complexity are reduced, and it is suitable for parallel communication of multiple devices.

CN122195909APending Publication Date: 2026-06-12崂山国家实验室
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
崂山国家实验室
Filing Date
2026-05-13
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing technologies struggle to address the issues of multi-channel RS485 real-time concurrent communication and low communication reliability. Traditional serial port expansion solutions suffer from high power consumption, high cost, and high complexity, failing to meet the engineering requirements for concurrent interaction of multiple devices.

⚗Method used

The CH9434 module is used, with each serial port having an independent configuration register, transmit/receive buffer, and status register. Combined with independently encapsulated transmit/receive functions, precise control of the target serial port is achieved through SPI instructions. A quartz crystal resonator is used to provide a stable clock signal, and a simplified power supply circuit is used to power the module.

🎯Benefits of technology

It enables parallel transmission and reception of multiple RS485 serial ports, improving communication real-time performance and reliability, reducing system power consumption and hardware costs, simplifying software development complexity, and adapting to the multi-channel communication needs of embedded systems.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application belongs to the technical field of communication and relates to a communication device and method for expanding multiple RS485 serial ports through an SPI port. The communication device comprises at least one CH9434 module, each serial port of the CH9434 module has independent configuration registers, a transceiving buffer area and state registers, each serial port is packaged with independent sending and receiving functions, the CH9434 module is configured to perform parameter configuration, data reading and writing and / or state query operations on a target serial port in response to an SPI instruction specifying a target serial port number, a control module communicates with each serial port of the CH9434 module through an SPI bus, the control module is packaged with an SPI reading and writing function, the control module is configured to generate an SPI instruction based on the SPI reading and writing function and send the SPI instruction to the CH9434 module, and a power supply circuit supplies power to the CH9434 module and the control module. The application can realize real-time concurrent high communication of multiple RS485 serial ports, and the communication reliability is high.
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