Asynchronous mode means that the LED display has the ability of storage and automatic playback. The edited text and non-grayscale pictures on the PC are transmitted to the LED display through the serial port or other network interface, and then automatically played by the LED display offline. There is no multi-gray display capability, mainly used for displaying text and simple graphic information, and it can be multi-screened.
The main control PC will display the information and various control commands to the control panel of the LED display screen through serial communication. The control panel inside the LED display screen contains the single-chip microcomputer and the memory, and the control panel inside the screen stores the information. Then, it is displayed on the LED display according to the command.
The asynchronous graphic LED display mainly includes:
1 adapter
The host computer adopts the serial port RS232 protocol to go online through the RS232-RS485 adapter, and the adapter is optically isolated.
2 control panel
Receiving the information to be displayed and various control commands transmitted by the PC through serial communication, the control board contains a single chip and a memory, and the on-screen control board stores the information and then displays it on the LED display according to the command. Features are as follows:
a. When the number of vertical points is less than 128, the number of horizontal points can be as long as 2000 points. If the vertical direction is 16 points, the horizontal direction is up to 4000 points.
b. The large-capacity memory supports a one-two-character font Chinese character font and a large number of proprietary fonts, and has a storage capacity of 16 screens.
c. It can be controlled by computer or offline.
d. The information can be saved for 1 year after power off.
e, with a perpetual calendar real-time clock function.
3 single cable (four core)
Four-wire system: one pair of differential twisted pair reception and another pair of differential twisted pair transmission. The communication distance is 1200 meters. It adopts bus-type networking structure and has a maximum load of 32 lower-level machines.
4 PC programming software
Dedicated communication LED display LED program programming software, in line with LED graphic display control protocol. Compilation and broadcast of text and image programs of multiple monochrome or dual-primary LED displays of different lengths and widths. Send up to 16 shows at a time.
5 LED graphic display control protocol
a. This agreement supports dot matrix monochrome and dual primary color text network LED display.
b. The networking form is bus type, the upper computer is a PC computer, and the lower computer is a single chip microcomputer in the LED display control board. The four-wire system is adopted, and the online protocol is RS485.
c. The host computer adopts the serial RS232 protocol to be converted and put online.
d. Support TCP/IP protocol transmission.
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