First, radio frequency wireless control
Working principle: one end of the RF module is connected to the control computer, and the other end is connected to the serial port of the control card. After the driver is installed in the computer, a virtual serial port will be generated to send data through this serial port.
Features: convenient installation and debugging, data transmission distance can reach 300- 1000 meters, and there is no charge for later use.
Required equipment and price: RF transmitting and receiving modules, one pair left and right in 350 yuan. Support one-to-many sending, that is, one sending module to multiple receiving modules. Disadvantages: Radio frequency bands are not allowed for civilian use. This batch of 433MHZ is extremely vulnerable to signal interference, and the transmission rate in this way is not very low. Baud rate can only be 4800 or 9600, which is not recommended.
Second, WIFI wireless control
Working principle: By installing a wireless router or other wireless equipment, it can bridge with the user's original wireless network, build a wireless local area network, and easily integrate the network control card into the wireless network for wireless network control.
Features: no wiring, convenient installation and debugging, fast data transmission.
Equipment required: bridges; Wireless router (the application on the display screen is to select the equipment with replaceable antenna so as to effectively receive wireless signals)
Disadvantages: The communication distance mainly depends on the gain capability of the bridge. The communication distance of wireless routing is relatively short, and the signal of partition wall is weak or no signal. Suitable for places with short-range wireless signals. It would be much easier if the area where your display screen is located has wireless signal coverage. Just connect the wireless router connected with the control card in the display to your wireless network, and you can control the display on any computer in the intranet.
Thirdly, GPRS wireless control.
Working principle: GPRS module completes the process of dial-up internet access after power-on and connects to the data center server. Customers access the server through client software, and the server forwards information.
Features: easy installation and debugging, no distance limit, as long as there is a cell phone signal, you can receive information, and the price is relatively cheap, generally within the range of 200~ 1000 yuan.
Disadvantages: GPRS module needs to install a mobile phone card to dial-up Internet access, which will generate certain traffic charges every month (for example, the traffic package of China Mobile 5 yuan can meet the demand). Due to the limitation of GPRS bandwidth, the transmission rate is slightly slow, which is more suitable for single and double color led display screen, mainly playing text.
Fourthly, 3G(WCDMA) wireless control.
Working principle: 3G module is also connected to the data center server through wireless network, and customers directly log in to the global simulcast cloud platform to release programs, which are directly sent to the control card by the server.
Features: WCDMA signal is stable, and there is basically no data loss during program transmission. Compared with GPRS, it is faster, can transmit pictures or videos, and is more suitable for LED full-color screen.
Disadvantages: Unicom's signal coverage is not high, and it may not be able to access the Internet in some remote areas.
Five, 4G full netcom wireless control
Working principle: basically the same as 3G/GPRS.
Features: 4G full netcom (fully supported by mobile, Unicom and telecom), fast transmission rate, complete real-time control, and immediate response to relevant control when sending instructions. Web page link