Synchronous control and asynchronous control refer to the way computers control LED displays.
The so-called synchronization control system refers to the LED display control system that synchronizes the content displayed on the display screen with the computer display screen in real time. One area of the computer display screen is identical to the content displayed on the LED display screen.
For example, control systems such as Lingxingyu, Depda, and Nova are all synchronous control systems. The traditional method is to send and receive cards, but there are also some that do not require sending cards.
Asynchronous control system, also known as offline control system, stores the display data edited by the computer in the display screen control system in advance. After the computer is turned off, it will not affect the normal display of the LED display screen.
Simply put, it means using a control card to edit content on a computer, or using a USB flash drive to place the content inside the control card, and then only one control card controls the display screen, without the need for computer control.
Synchronous and asynchronous display screens
1) CRT synchronous display refers to the real-time and synchronous reflection of the display content on the computer CRT display screen by the LED display screen.
The maximum control pixel limit for the sending card of the synchronous control system is 1280 points × 1024 points. The receiving card in the full color screen control system should preferably be one box and one receiving card.
2) Asynchronous control refers to the computer sending edited content to the receiving card of the display screen through a communication program. The receiving card (with memory) saves the content and then plays it in a loop according to the computer edited order, display method, dwell time, etc.
The maximum control pixel limit for the control system of the indoor screen in asynchronous control mode is 2048 points × 256 points.
The maximum control pixel limit of the outdoor screen control system using asynchronous control method is 2048 points × 128 points.
Both synchronous and asynchronous control methods have identical screen surfaces and basic display functions.
The main difference between the two is:
Asynchronous display screens usually do not need to be connected to a computer. The display screen has a built-in CPU, which can save multiple images when powered off and run independently from the computer. Some screens also have clock chips that can automatically display calendars and clocks.
When it is necessary to modify the displayed content, it can be modified by connecting to the microcomputer through the RS232 interface.
The synchronous display screen must be connected to a computer to work.
Asynchronous display screens usually have fewer display modes, with only pop-up, pull-up, up scrolling, and down scrolling.