The LED display is mainly for displaying various characters, symbols and graphics. The screen display information is edited by the computer, and is pre-positioned into the frame memory of the LED display screen through the RS232/485 serial port, and then displayed on a screen-by-screen basis. The display is colorful and works offline. LED display has wide application in various industries because of its flexible control, convenient operation, high stability and long service life.
The development of LED display has been more than 20 years old. Like other LCD splicing and engineering projectors, LED display has been accompanied by technological advancement and upgrading since its inception, displaying text content from the beginning to the later. Graphic and dynamic video. Currently widely used in outdoor advertising, stage performances, exhibitions, stadium events, conference centers and command centers.
LED display control system is also called LED display controller and LED display control card. It is the core component of the LED display, which is mainly responsible for receiving the picture and video display information from the computer serial port or DVI interface, placing it into the frame memory, and generating the serial display data that can be recognized by the LED display screen according to the partition driving method. Scan control timing.
LED display control system - asynchronous control
LED display asynchronous control system is also called LED display offline control system or offline card. 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 card inside the LED display screen contains the single chip and the memory, and the control card in the screen stores the information. Then, it is displayed on the LED display according to the command.
Mainly used to display a variety of text, symbols and graphics or animation. The screen display information is edited by the computer, and the frame memory of the LED display screen is pre-positioned through the RS232/485 serial port, and then displayed on the screen by screen, and the display mode is colorful and varied. Generally, there is no multi-gray display capability, which is mainly used for displaying text and simple graphic information, and can be multi-screened.
Its main features are: simple operation, low price and wide range of use. LED display simple asynchronous control system can only display digital clock, text, special characters. In addition to the function of the simple control system, the LED display graphic asynchronous control system has the largest feature of controlling the display screen content by region. Support for analog clock display, countdown, picture, table and animation display. With timing switch, temperature control, humidity control and other functions.
The asynchronous graphic LED display mainly includes:
1 The adapter host computer adopts the serial port RS232 protocol to go online through the RS232-RS485 adapter, and the adapter is optically isolated.
2 The control card receives the information to be displayed and various control commands transmitted by the PC through serial communication. The control card contains the MCU and the memory. The control card in the screen 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, can be controlled by computer, or can be displayed offline.
c. 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.
d, with a perpetual calendar real-time clock function.
e. The information can be saved for 1 year after power off.
PC programming software dedicated communication LED display LED 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.
A single network cable (four cores) uses a 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.
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. Support TCP/IP protocol transmission.
d. The upper computer adopts the serial RS232 protocol to be converted and put online.
control card
There are many types of control cards on LED displays, and there are many companies that produce control cards, such as Mosier, Lingxing, Zhongqing, Yangbang, Yukuo, Jinhan, etc. Simply put into: Full color synchronization card, asynchronous offline card, full color video offline card With the rapid development of LED display in the past 2 years, the market for LED control card has become more extensive, especially in 2009. U disk LED control card is currently used the most, can be connected to the computer with a serial port, can also use U disk to transfer information, save the computer, free wiring, support analog clock, water border, U disk LED control card can save the computer, save wiring.
C type card (partition card) (U disk and serial port dual communication function)
1, support 4 sweep, 8 sweep, 16 sweep of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2, support the flow of water border and analog clock function, more prominent display content.
3. The maximum controllable range is 114688 points, and the number of double color points is halved. At the same time, 4 08 interfaces and 4 12 interfaces are built in, which can be expanded to 8 interfaces.
4, display function: support text, pictures, animation, EXCEL form, time, temperature, inverted (positive) timing.
5, can be used to make door screens, poster screens, car screens and other types of screens.
6, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
7, with serial communication and U disk input information dual functions.
8, support a U disk management multi-block display function, convenient multi-screen centralized management.
E-type card (time partition) (U disk and serial port dual communication function)
1. Support 4 sweeps, 8 sweeps, 16 sweeps, support a variety of indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2, the maximum controllable range of monochrome 40,960 points, two-color points reduced by half, built-in three 08 interfaces and three 12 interfaces, can be extended to eight interfaces.
3, display functions: text, pictures, animation, time, temperature, inverted (positive) timing.
4, can be used to make door screens, poster screens, car screens and other types of screens.
5, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
6, with serial communication and U disk input information dual functions. 7, support a U disk management multi-block display function, convenient multi-screen centralized management.
G type card (serial communication function)
1. Same as above, support 4 sweep, 8 sweep, 16 sweep of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2. Supports the flow border and analog clock function to further highlight the display content.
3. The maximum controllable range of the same color is 114,688 points, and the number of double-color points is halved. The built-in 4 08 interfaces and 4 12 interfaces can be expanded to 8 interfaces.
4, display functions: text, pictures, animation, EXCEL form, time, temperature, inverted (positive) timing.
5, can be used to make door screens, poster screens, car screens and other types of screens.
6, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
7, with serial communication function.
F-type card (time partition) (serial communication function)
1, support 4 sweep, 8 sweep, 16 sweep of various indoor, outdoor, semi-outdoor single and double color display panels, one card can be arbitrarily set.
2. The maximum controllable range is 40960 dots, the number of double color points is halved, and 3 08 interfaces and 3 12 interfaces are built in, which can be expanded to 8 interfaces.
3, display function: text, picture, animation, time, temperature, inverted (positive) timing.
4, can be used to make door screens, poster screens, car screens and other types of screens.
5, set the lock screen function, built-in 4 groups of time switch machine time, can be set to use.
6, with serial communication function. According to different needs, you can use the serial port to connect to the computer, or you can use the U disk to transfer information. U disk control card can save the computer, save wiring, control 100,000 points, one card.
Can you boost your WiFi signal with outdoor 4G CPE?
When you travel or go to some remote areas, you may be annoyed by poor reception. Is there any way to get a strong WiFi router signal outdoors in a 4G LTE network? Very good, outdoor 4G CPE router would be a good choice!
What is an outdoor 4G CPE router?
An outdoor 4G CPE router differs from a Wifi-only router in that it needs to be connected to a fiber optic network. The 4G CPE WiFi router can pick up the carrier's 4G LTE network signal and convert it into broadband and Wi-Fi. Just plug in your SIM card with your data plan and enjoy a stable and reliable WiFi signal with family and friends. This Outdoor CPE can be used in harsh environments. If you install your router outside or near a window in an area with a weak 4G signal, your device can receive a better 4G signal.
Second, what are the characteristics of outdoor 4G CPE router?
1. Better network for ODU and IDU
4G CPE outdoor routers include an outdoor unit (ODU) and an indoor unit (IDU). Help your device receive the best outdoor cellular signal through the ODU, and connect to the indoor WiFi router through the network cable to experience better network speed. As shown in the figure below, an outdoor LTE CPE (ODU) is installed outdoors and connected to an indoor Wi-Fi router (IDU) via a network cable. The entire 4G device is powered by POE. This data will be transmitted over the same Ethernet cable, eliminating the need to connect the ODU to a power outlet.
2. High-speed multi-user available
The outdoor 4G CPE features a built-in 4G LTE modem and a 5dBi high-gain antenna. LTE CAT4, download speeds up to 150Mbps, WiFi speeds up to 300Mbps, can connect 32 users at the same time. The high-gain antenna of the outdoor 4G CPE router enables it to have higher power and stronger signal transmission and reception capabilities than mobile phones. Therefore, the CPE router can receive the signal. If your phone can't receive a signal in some areas. Sometimes you also use your phone as a hotspot to share Internet access with your friends, right? Similarly, this 4G LTE CPE router allows 32 users to connect to WiFi at the same time, allowing more users to connect and receive a better signal than a phone sharing hotspot. In addition, the IDU has four Lan ports and can be connected to the device through network cables, which is also a backup mode of the Internet.
3. Excellent outdoor performance and design
On the one hand, outdoor LTE CPE is waterproof, UV resistant and corrosion resistant. It can be used at -20℃~60℃ operating temperature. Therefore, it is ideal for outdoor deployment. On the other hand, there are a variety of installation methods. CPE can be mounted on Windows or walls by mounting brackets. It is also possible to attach it to the antenna mast. In addition, the signal strength is displayed through the LED indicator to facilitate users to find the best location to get a better 4G signal.
4. Support different frequency bands
Outdoor 4G CPE supports a variety of frequency bands, including LTE-FDD, LTE-TDD, 3G WCDMA, and 2G GSM network bands. Meet the needs of different frequency bands in different regions and make full use of network resources.
5. Convenient management of CPE
Start the Web browser to log in to the Web management page. You can configure and manage the CPE easily. The web management system supports Linux. Provides functions such as WebUI management, Telnet, SSH terminal system status monitoring, NTP client, synchronization between devices and the system clock network, and configuration file import and export.
6. Applicable to various application scenarios
CPE is designed to provide ISP or operator with 4G LTE outdoor wifi router to facilitate network connection, whether at home, or in enterprises and remote areas, to bring users a wonderful network experience.
All in all, an outdoor 4G CPE router is an excellent choice for connecting to the Internet in remote areas and places where the signal is weak, the wired network is unreliable, or there is a lack of reliable WiFi. It's worth deploying outdoor CPE in rural, coastal, boat, caravan, campsite and remote areas to enjoy the best network speeds and outdoor activities! It can even reduce complex cabling deployments for home networks without the need to install a wired fiber network.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommtech.com