무선 기술 Zigbee, WiFi와 433MHz의 특징

무선 기술 Zigbee, WiFi와 433MHz의 특징

Zigbee, WiFi와 433MHz는 근거리 무선 통신을 위한 세 가지 서로 다른 기술입니다.. 각 기술에는 장단점이 있습니다..

지그비는 저전력이다., 신뢰성이 높다, 무선 메시 네트워킹 기술. 라우터를 사용하여, 네트워크 적용 범위를 쉽게 확장하고 조정할 수 있을 뿐만 아니라, but also the “blind spot” in wireless communication environment can be eliminated. 게다가, Zigbee supports star, tree and mesh topologies. 따라서, Zigbee is well-suited for both simple and complex built environment. Compared to the WiFi, 하나, 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, 하나, the data exchanged between server and terminals generally are just small amount. 따라서, 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. 하나, it has some drawbacks which have been noticed by the consumers, such as high power consumption, low reliability, long reconnection time, 기타.

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