Bidirectional signal transmission system and device management method thereof

Abstract

The invention discloses a bidirectional signal transmission system and a device management method thereof. The system comprises a main control device and controlled devices which are connected througha power line; the main control device is used for sending first signals by modulating the square-wave voltage frequency of a direct current power supply and receiving second signals by detecting theload current change on the power line; and the controlled devices are used for conducting square-wave voltage frequency extraction and demodulation on the input power to obtain the first signals and sending the second signals by changing the loads of the controlled devices. The method comprises the steps that the main control device conducts addressing on the various controlled devices according to the address number order from small to big; and the main control device polls various address numbers in a timing mode and detects the stages of the controlled devices corresponding to the various address numbers according to the response conditions after the various address numbers are sent. Accordingly, bidirectional signal transmission can be achieved through the power line, the wiring complexity is reduced, and the working states of the various controlled devices can be monitored in real time.

Description

technical field [0001] The invention relates to the field of signal transmission, in particular to a two-way signal transmission system and a device management method thereof. Background technique [0002] In the current LED cascade drive application, there are mainly two implementation schemes: 1. Three-wire series cascade drive. The driving data of each LED light point comes from the output of the previous LED light point. The advantages of this application are: The wiring is simple and the transmission distance is long. The disadvantage is that there should be no dead pixels in the cascade connection, otherwise the subsequent LED drive circuit will not be able to receive the drive data, resulting in the failure of all LED points connected in series to display normally, which will affect the overall lighting. Effect; 2. Five-wire parallel drive, that is, DMX512 protocol, all LED light points read display data from the differential bus. The advantage of this application is ...

AI Technical Summary

Problems solved by technology

[0002] In the current LED cascade drive application, there are mainly two implementation schemes: 1. Three-wire series cascade drive. The driving data of each LED light point comes from the output of the previous LED light point. The advantages of this application are: The wiring is simple and the transmission distance is long. The disadvantage is that there should be no dead pixels in the cascade connection, otherwise the subsequent LED drive circuit will not be able to receive the drive data, resulting in the failure of all LED points connected in series to display normally, which will affect the overall lighting. Effect; 2. Five-wire parallel drive, that is, DMX512 protocol, all LED light points read display data from the differential bus. The advantage of this application is that LED bad points will not affect the normal display of other LED light points, and the overall brightness The transformation effect is not affected, but the disadvantage is that the wiring is complicated and the transmission distance is limited

[0003] In addition, these two applications can only send display data from the control system to the LED light point, but cannot transmit information from the LED light point to the control system, and cannot achieve two-way transmission, that is, cannot return any parameters from the LED light point, so it is impossible to judge Is the LED light working normally?

Images