The wireless barcode scanner currently on the market mainly use the following communication technologies:
1. Bluetooth, divided into HID and SPP modes. Bluetooth communication is characterized by adapting to all Bluetooth devices, higher compatibility, medium transmission distance, and moderate power consumption.
2. 2.4G wireless transmission, which is also a kind of Bluetooth technology.
3. WiFi transmission, in theory, as long as there is a repeater, there is no problem how far Wifi needs to be transmitted, and the area coverage is relatively wide.
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The following explains their differences in detail:
The difference between 2.4G and Bluetooth:
2.4GHz wireless technology is a short-distance wireless transmission technology with the two-way transmission, strong anti-interference, long transmission distance (short-distance wireless technology range), and low power consumption. 2.4G technology can be contacted within 10 meters. To the computer.
Bluetooth technology, which is a wireless transmission protocol based on 2.4G technology. Because of the different protocols used, it is different from other 2.4G technologies and is called Bluetooth technology.
In fact, Bluetooth and 2.4G wireless technology are two different terms. But in terms of frequency, there is no difference between the two, both are 2.4G frequency bands. Note that the 2.4G frequency band does not mean that it is 2.4G. In fact, the Bluetooth standard is from 2.402-2.480G these frequency bands. 2.4G products must be equipped with a receiver. Nowadays, 2.4G wireless mice are equipped with a receiver; while Bluetooth mice do not need a receiver, they only need to share any product with Bluetooth functionality to realize the connection operation. The most important thing is that the receiver of the 2.4G wireless mouse can only work in one-to-one working mode; while the Bluetooth module can realize one-to-many working mode. The advantages are also disadvantages. 2.4G technology products are connected quickly, and Bluetooth technology products need to be paired, but 2.4G technology products must have an additional USB interface, and there are other advantages and disadvantages. The current products using Bluetooth technology are mainly Bluetooth headsets and Bluetooth speakers. 2.4G technology products are mainly wireless keyboards and mice.
The difference between Bluetooth and WIFI:
Both Bluetooth and WIFI are wireless communication network standards. Their similarity is that they all work in the ISM2.4GHz public frequency band.
The difference is that Bluetooth uses the FHSS (Frequency Hopping Spread Spectrum) method, which generally hops 1600 times per second, dividing the 83.5MHz frequency band into 79 frequency band channels, and each time only occupies a 1MHz bandwidth. The communication distance is generally 10 meters, and the latest version Bluetooth 4.0 launched in April this year can reach a transmission distance of 50 meters.
The protocol used by wifi is the IEEE802.11b local area network protocol. Its transmission range is 100 meters, and the maximum speed can reach 11Mbps. It uses DSSS (direct sequence spread spectrum) and QPSK or BPSK (phase shift keying), and the bandwidth is 22MHz.
Bluetooth belongs to WPAN wireless local area network, namely point-to-point. And wifi is a WLAN wireless local area network, a network mode in which multiple terminals transmit at the same time.RF 433
The 433 technology uses the 433MHz wireless frequency band, so compared to WiFi and Zigbee, the significant advantage of 433 is the penetration of wireless signals and the ability to spread farther. Its disadvantage is that the data transmission rate is only 9600bps, which is far less than the data rate of WiFi and Zigbee. Therefore, the 433 technology is generally only suitable for applications with a small amount of data transmission.
433 has a long signal transmission distance, strong penetration and diffraction ability, good anti-interference ability, high stability, can adapt to most application environments, and its power consumption is low, and the cost is much lower than Bluetooth and WiFi solutions.
The 433 module is very suitable for IoT solutions, such as sensor data collection, automation control, etc. Nowadays, 433 modules have been put into application more and more widely.
Add: No3 Hao Tai Technology Park,Shenzhou Road 768,Sicence City,Luogang District,Guangzhou,China
No3 Hao Tai Technology Park,Shenzhou Road 768,Sicence City,Luogang District,Guangzhou,China