Wireless Technology Zigbee, WiFi thiab 433MHz lawv cov yam ntxwv

Wireless Technology Zigbee, WiFi thiab 433MHz lawv cov yam ntxwv

Zigbee, WiFi thiab 433MHz yog peb qhov kev sib txawv rau cov kev sib txuas lus luv luv. Txhua thev naus laus zis muaj nws qhov zoo thiab cons.

ZigBee yog lub zog qis, zoo ntseeg tau, Mesh maining tshuab. Los ntawm kev siv cov routers, tsis yog cov chaw npog npog network tuaj yeem yooj yim nthuav tawm thiab kho tau, but also the “blind spot” in wireless communication environment can be eliminated. In addition, Zigbee supports star, tree and mesh topologies. Yog li ntawd, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, txawm li cas los xij, Zigbee’s data rate is 250kbps, lower than WiFi’s 11Mbps-54Mbps. That makes Zigbee inappropriate for high data rate applications, such as internet surfing, large file downloading or uploading. For restaurant and catering industry, txawm li cas los xij, the data exchanged between server and terminals generally are just small amount. Yog li ntawd, Zigbee is a quite suitable technology for ordering application.

WiFi can support high-data-rate applications. It also supports “always-on” feature, which makes the WiFi attractive for some applications. Txawm li cas los, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, Tus qauv USB-Wiegand converter tuaj yeem paub txog.

433MHz technology has been widely used in China for restaurant ordering application. Since it uses relatively low frequency band, its wireless signal can be transmitted further than Zigbee and WiFi, which operates in 2.4GHz band. Txawm li cas los, the data rate of 433MHz is only 9.6kbps, much lower than WiFi and Zigbee’s data rate. Yog li ntawd, 433MHz suits the application in which only small amount of data needs to be transmitted. In addition, same as WiFi, 433MHz supports star topology only, which may cause “blind spot” within the wireless network coverage area.

Different from the WiFi’s “always-on” feature, in Zigbee and 433MHz system, the wireless link is established only when there is data need to be transmitted. This mechanism can dramatically reduce the interference to other devices in the network. The power consumption of the device is also reduced. Txawm li cas los, If “always-on” is requested in Zigbee or 433MHz system, a function can be designed in the application software to support this feature.
(Qhov chaw: Shehzhen Seabreeze Smart Card Co., Ltd.)