Беспроводная технология Zigbee, WiFi и 433МГц их характеристики

Беспроводная технология Zigbee, WiFi и 433МГц их характеристики

Zigbee, Wi-Fi и 433 МГц — это три разные технологии беспроводной связи ближнего действия.. Каждая технология имеет свои плюсы и минусы.

Zigbee — маломощный, очень надежный, технология беспроводной ячеистой сети. С помощью маршрутизаторов, не только зона покрытия сети может быть легко расширена и скорректирована, but also the “blind spot” in wireless communication environment can be eliminated. К тому же, Zigbee supports star, tree and mesh topologies. Следовательно, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, тем не мение, 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, тем не мение, the data exchanged between server and terminals generally are just small amount. Следовательно, 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. тем не мение, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, и т.д.

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. тем не мение, the data rate of 433MHz is only 9.6kbps, much lower than WiFi and Zigbee’s data rate. Следовательно, 433MHz suits the application in which only small amount of data needs to be transmitted. К тому же, 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. тем не мение, If “always-on” is requested in Zigbee or 433MHz system, a function can be designed in the application software to support this feature.
(Источник: Компания Shehzhen Seabreeze Smart Card Co., Ltd.)