In response to the development of The Times, wireless control has become more and more functional, even if people in the office can control the outside LED display. So how many wireless control methods for LED displays?
1. RF wireless control
Working principle: the RF module receives the control computer at one end, the other end receives the control card serial port, the computer installs the driver, generates a virtual serial port, and sends the data through this serial port.
Features: the installation and debugging is convenient, the data transmission distance can be up to 300 to 1000 meters, the later use does not need cost.
Equipment and price: RF transmission, acceptance module, about 350 CNY. Support for one-to-many transmission, that is, a send module to multiple acceptance modules.
Disadvantages: radio frequency band, few countries allow civilian, this batch of 433 MHZ, extremely susceptible to interference signal, transmission rate and this way is not very low, baud rate can only use 4800 or 9600, not recommended.
2. WIFI wireless control
Working principle: by adding wireless router or other wireless devices, with users of the original bridge wireless network, build a wireless local area network (LAN), convenient control the network card into the wireless network, wireless network control.
Features: no wiring, easy installation and debugging, fast data transmission.
Equipment and price: bridge, within 800 CNY; A wireless router (preferably a device that can be used to change the antenna on a screen, which can effectively receive a wireless signal), costs about 100 CNY.
Disadvantages: the communication distance mainly depends on the gain ability of the bridge, the communication distance of the wireless route is relatively short, the wall signal is weak or no signal. Suitable for short distances with wireless signals. If you display area had the wireless signal coverage, that is more simple, just need to display wireless router connected to the control card in receiving your wireless network, the bridge can be trying any control on a computer screen.
3. GPRS wireless control
Working principle: the GPRS module is connected to the data center server after the power of the GPRS module is connected to the data center server, and the client accesses the server through the client software, which is forwarded by the server.
Features: easy to install and debug, no distance limit, as long as there is a mobile phone signal, can receive the information, and the price is cheaper, generally in 200 ~ 400 CNY range.
Disadvantages: the GPRS module needs to install a mobile phone card to dial up the Internet, and it will generate a certain amount of traffic costs every month (such as China mobile minimum 5 CNY of flow package can meet the demand). The bandwidth of GPRS is limited, and the transmission rate is slightly slow, so it is better to play the led display with single and double colors.
4. 3G (WCDMA) wireless control
Working principle: 3G module is also connected to the data center server via wireless network, and the customer has direct access to the global broadcast cloud platform to release the program, which is sent directly to the control card by the server.
Characteristics: WCDMA signal is stable, and there will be no data loss in the process of sending the program, which is faster than GPRS, which can transmit pictures or video, which is suitable for full color screen.
Cons: unicom's signal coverage is not as high as China mobile, and it is possible that there will be an unnetworked situation in isolated areas.
5. 4G complete netcom wireless control
Working principle: same as 3G/GPRS.
Features: 4G total netcom (China mobile, China unicom, China telecom full series support), rapid transmission rate, complete real-time control, send commands instantaneous response to relevant control.
Disadvantages: when the data volume is larger, the flow rate is relatively large.