Method for realizing single-fiber bidirectional transmission between play controller and display terminal

Abstract

The invention provides a method for realizing single-fiber bidirectional transmission between a play controller and a display terminal. The method comprises the following steps: an upper computer outputs parallel video data to an SDI (Serial Digital Interface) encoding chip; the upper computer generates a control command data packet according to a frame format and sends the control command data packet to a microprocessor; the microprocessor sends the control command data packet to the SDI encoding chip after verification; after being encoded, the control command data packet is sent to an OPS audio-video converter; the OPS audio-video converter converts an SDI signal embedded with the control command into an HDMI and serial port signal and sends the HDMI and serial port signal to a displayterminal; and the OPS audio-video converter receives the state data returned by the display terminal, generates a data packet according to a frame format, converts the data packet into an optical signal and sends the optical signal to the upper computer. The method has the advantages that an SDI single-fiber bidirectional transmission system realizes bidirectional remote transmission of high-speedvideo signals and low-speed serial port control signals, and the functions of audio and video signal transmission and remote control and state query on a display terminal are simultaneously realizedby using one optical fiber; and the system is simple in wiring, easy to install and deploy, and low in cost.

Description

technical field [0001] The invention belongs to the technical field of rail transit ground PIS systems, and in particular relates to a single-fiber bidirectional transmission method between a playback controller and a display terminal. Background technique [0002] The LCD playback controller, the core equipment of the subway PIS station subsystem, has an important function to receive the gateway instructions from the control center, including the realization of the switch screen and status query of many display terminals (such as LCD displays) in the station hall and platform. . The traditional display terminal control methods are as follows: 1. Use the remote control to control through infrared emission. Because it needs to be controlled locally on the device, the efficiency is extremely low and has been eliminated. 2. Control the power on and off of the display terminal by controlling the power controller to realize the switch screen. The power controller is expensive an...

AI Technical Summary

Problems solved by technology

The traditional display terminal control methods are as follows: 1. Use the remote control to control through infrared emission. Because it needs to be controlled locally on the device, the efficiency is extremely low and has been eliminated.

2. Control the power on and off of the display terminal by controlling the power controller to realize the switch screen. The power controller is expensive and can only realize the switch screen and has a single control function, but the control and query are not the display terminal itself. state, there is a large uncertainty

3. Through the way of external serial port, but need to add a serial port server, in addition to the original video transmission cable, and increase the control cable

None of the above methods can well realize the control and status query functions of the display terminal

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