DMX512 data transmission method based on BPLC (Broadband Power Line Communication)

Abstract

The invention provides a DMX512 data transmission method based on BPLC (Broadband Power Line Communication). The method comprises the step of S1, carrying out caching through utilization of double buffers, specifically, caching and receiving DMX512 data from a DMX512 master console by a sending end BPLC modulator-demodulator through utilization of a double buffer mechanism. According to the method, the condition that a whole bus system crashes due to a node fault and the impedance mismatch problem can be completely solved. According to the BPLC, signal transmission is carried out based on power lines, wiring and maintenance workload of signal lines are further reduced, and the number of nodes is not limited. On the basis of DMX512 data transmission, repeatedly refreshed data packets are detected. For transmission of repeated data parts, through transmission phase locking, phase locking is automatically and repeatedly refreshed. Redundant load is prevented from being retransmitted by abus, load of the bus is effectively mitigated, a half-duplex bandwidth utilization rate is clearly balanced, uplink communication bandwidths are improved, bandwidths are utilized effectively to the greatest extent, transmission is relatively efficient, and relatively high information quantity is transmitted. The method can be applied to a relatively high-speed and real-time DMX512 application scene.

Description

technical field [0001] The present invention relates to the technical field of data transmission, in particular to a DMX512 data transmission method based on BPLC (Broadband Power Line Communication (Broadband Power Line Communication, BPLC for short in English)). Background technique [0002] The outdoor landscape lights based on the DMX512 protocol adopt the RS485 bus mode. Facing the problems of the limited number of nodes and impedance mismatch in the RS485 bus, it brings great difficulties to the on-site installation and debugging, especially when a node of the bus fails, the It will lead to problems such as imbalance or paralysis of the entire bus, which will bring a very huge workload to the later maintenance. The existing DMX512 bus transmission adopts a completely transparent transmission method, that is, the data transmitted by the DMX512 host is completely transparently transmitted to each terminal device through the RS485 bus, because some of the data transmitted...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the DMX512 data transmission based on the RS485 bus in the prior art. When a certain node in the bus breaks down, the whole system will be paralyzed, and because the DMX512 downlink transmission data volume is large, the bus downlink data transmission is very busy. The uplink bandwidth is seriously insufficient, and it is difficult to adapt to the problem of DMX512 application scenarios with higher speed requirements. A BPLC-based DMX512 data transmission method is proposed.

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