Бездротова технологія Zigbee, WiFi і 433MHz їх характеристики

Бездротова технологія Zigbee, WiFi і 433MHz їх характеристики

Zigbee, Wi -Fi та 433 МГц - це три різні технології для бездротового зв'язку короткого діапазону. Кожна технологія має свої плюси і мінуси.

Зигбі - низька потужність, дуже надійний, Технологія бездротової сітки мережі. Використовуючи маршрутизатори, Не тільки область покриття мережі можна легко розширити та регулювати, but also the “blind spot” in wireless communication environment can be eliminated. В додаток, Zigbee supports star, tree and mesh topologies. Тому, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, проте, 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, проте, the data exchanged between server and terminals generally are just small amount. Тому, 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. Проте, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, і 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. Проте, the data rate of 433MHz is only 9.6kbps, much lower than WiFi and Zigbee’s data rate. Тому, 433MHz suits the application in which only small amount of data needs to be transmitted. В додаток, 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. Проте, If “always-on” is requested in Zigbee or 433MHz system, a function can be designed in the application software to support this feature.
(Джерело: Shehzhen Seabreeze Smart Card Co., Ltd.)