RS485 Address Auto-Setting via Power-On Timing
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Solution Overview
Problem
Existing methods for setting addresses in RS485 systems are either time-consuming or require additional hardware costs, as they either require sequential startup of slave devices or simultaneous startup with complex port management.
Innovation Solution
A method where the host device confirms no addresses exist in the database, then turns on slave devices sequentially, calculates their power-on times, and sets their addresses based on these times when they exit an idle state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential startup method is used to set addresses, then address setting can be completed, but startup time becomes lengthy
Solution Approach 1:
The patent applies periodic action by implementing cyclic address setting operations. The host device repeatedly sends address setting commands in cycles, with each cycle addressing one slave device. The system periodically checks whether all slave devices have been assigned addresses and continues cycling until completion, thus resolving the contradiction between sequential processing and time consumption.
Solution Approach 2:
The patent applies preliminary action by having the host device prepare and send address setting commands in advance before slave devices are fully initialized. The host device proactively manages the address assignment process by pre-calculating addresses and sending commands ahead of time, reducing the overall startup time while maintaining sequential accuracy.
2Productivity
If simultaneous startup with multiple RS485 ports is used, then address setting can be parallelized, but hardware cost increases
Solution Approach 1:
The patent applies universality by making the single RS485 port perform multiple functions sequentially. The same port is used for both address setting operations and normal data communication, eliminating the need for separate dedicated address setting ports. The host device manages time-multiplexed communication, allowing one port to serve multiple purposes without increasing hardware complexity.
Solution Approach 2:
The patent applies self-service by enabling the existing RS485 communication infrastructure to handle address setting automatically without requiring additional dedicated hardware. The system uses its own communication ports and protocols to perform the address configuration, making the existing hardware work harder rather than adding more hardware.
3Device complexity
If sequential address setting is implemented, then hardware requirements are simple, but the process is time-consuming
Solution Approach 1:
The patent applies continuity of useful action by ensuring the host device continuously manages address setting operations without idle periods. The host device maintains an ongoing process of sending commands, receiving responses, and advancing to the next slave device without interruption, maximizing the efficiency of the simple hardware configuration through continuous productive activity.
Solution Approach 2:
The patent applies feedback by implementing a response verification mechanism where the host device sends address setting commands and waits for acknowledgment from slave devices. The system continuously monitors whether addresses have been successfully set and adjusts its operation accordingly, providing feedback-driven efficiency improvement without requiring complex hardware.
Data Source
AI summary
A method for automatically setting addresses suitable for an RS485 system is provided. The RS485 system includes a host device and a plurality of slave devices. The method includes the following stages. The host device confirms that there are no addresses of the slave devices in a database. The slave devices are turned on in sequence. The slave devices calculate their own respective power-on times. The slave device enter an idle state during the period associated with the power-on time. Only one of the slave devices sends the power-on time to the host device when said slave device leaves the idle state. The host device sets the address of said slave device according to the power-on time when said slave device leaves the idle state.