Daisy Chain LED Nodes Retransmitting Data Bytes for Group Addressing
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Solution Overview
Problem
In illumination systems, particularly LED systems, daisy chaining bus structures require each node to receive and retransmit data packets, leading to inefficient use of resources when multiple nodes behave identically, as all nodes must receive separate data bytes, even if they carry the same value, necessitating more complex and expensive masters.
Innovation Solution
Nodes are assigned different behaviors based on their position in a group, with all but the last node in a group retransmitting the first data byte without removing it, allowing identical nodes to share a single byte, and using a counter or modified start code to determine behavior, enabling simpler and cheaper master configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each node removes the first data byte before retransmission (Behaviour A), then individual node addressing is achieved, but resource usage increases when multiple nodes have identical behavior
Solution Approach 1:
The patent introduces dynamic behavior switching for nodes based on received data patterns. Nodes can switch between Behaviour A (remove first byte) and Behaviour B (repeat first byte) dynamically, allowing the system to adapt between individual addressing mode and group addressing mode, thus resolving the contradiction between individual addressing capability and resource efficiency
Solution Approach 2:
The patent changes the behavioral parameter of nodes based on the content of received data bytes. When nodes receive identical consecutive bytes, they switch to Behaviour B to repeat the byte, reducing the number of bytes required. This parameter change allows the system to optimize resource usage while maintaining individual addressing capability when needed
2Ease of operation
If all nodes receive separate data bytes even with identical values, then individual node control is maintained, but master complexity and cost increase
Solution Approach 1:
The master device benefits from the dynamic behavior switching capability of nodes, allowing it to send fewer bytes when controlling groups of identical nodes. The master can switch between controlling individual nodes (using Behaviour A) and controlling groups (using Behaviour B), reducing master configuration complexity and cost while maintaining individual node control capability when needed
3Quantity of substance
If nodes in a group share a single byte, then resource usage is reduced, but behavior differentiation between nodes is limited
Solution Approach 1:
The patent enables nodes to dynamically switch between Behaviour A and Behaviour B, allowing them to differentiate their behavior based on application needs. Nodes can individually opt out of group behavior by switching to Behaviour A, thus maintaining adaptability and versatility while enabling resource-efficient group addressing when nodes have identical behavior
Data Source
AI summary
A data communication method is described for transmitting a data packet comprising data bytes in a daisy chained bus structure of a LED illumination system. The method comprises: the nodes of a group, except the last node of the group retransmitting the data packet without removing a first data byte from the incoming data packet; and the last node in the group removing the first byte from the data packet before retransmission. The invention further comprises a communication node, illumination assembly and bus structure implementing the method according to the invention.