Characteristics of ZigBee (1)

In the process of using Bluetooth technology, people find that although bluetooth technology has many advantages, it still has many defects. For industry, home automation control and industrial telemetry and remote control, Bluetooth technology is too complex, power consumption, short distance, networking scale is too small... And industrial automation, the demand for wireless data communication is more and more intense, and for the industrial site, this wireless data transmission must be highly reliable, and can resist all kinds of electromagnetic interference in the industrial site, in the power industry router, and other industrial router application is also very common. So, after a long effort, the ZigBee protocol was officially launched in mid-2003. In addition, ZigBee uses Home RF Lite, a communication protocol for Home networks that was developed before it.

ZigBee technology is a kind of wireless communication technology between various electronic devices which is applied in a short distance range and low transmission data rate. ZigBee derives its name from the communication method that bees rely on for survival and development. Bees use zigzag-shaped dance to inform the location, distance and direction of new food sources, which is the name of a new generation of wireless communication technology. ZigBee, also known as "HomeRF Lite", "RF-Easylink" or "FireFly" radio technology in the past, is currently known as ZigBee technology.

First of all, ZigBee is the pronoun of IEEE802.15.4 protocol. The technology specified in this protocol is a short-range, low complexity, low power consumption, low data rate, low cost two-way wireless communication technology, mainly suitable for automatic control and remote control field, can be embedded in a variety of devices, while supporting geographical positioning function.

ZigBee is a wireless data transmission network platform composed of up to 65000 wireless data transmission modules, which is very similar to the existing CDMA network or GSM network of mobile communication. Each ZigBee network data transmission module is similar to a base station of mobile network. Within the whole network range, they can communicate with each other. The distance between each network node can range from 75 meters as standard to hundreds of meters or even kilometers after expansion; In addition, the entire ZigBee network can also be connected to various other existing networks. For example, you could monitor a ZigBee control network somewhere in the Netherlands from Denmark via the Internet.

Since bees communicate the location and distance of pollen with their peers by flying and zig dancing, they form a communication "network" in the colony. So ZigBee's inventors graphically use this behavior of bees to graphically describe this wireless information transmission technology.

The difference is that ZigBee network is mainly established for automatic control of data transmission, while mobile communication network is mainly established for voice communication; While mobile base stations typically cost hundreds of thousands of dollars or more, ZigBee" base stations "cost less than $200; Each ZigBee network node can not only connect with monitoring objects, such as sensors, directly for data collection and monitoring, but also automatically transfer data from other network nodes. In addition, each ZigBee network node (FFD) can connect wirelessly to multiple isolated child nodes (RFD) that do not relay network information within its own signal coverage.

Each ZigBee network node (FFD and RFD) can support up to 31 sensors and controlled devices, and each sensor and controlled device can eventually have eight different interfaces. Digital and analog data can be collected and transmitted.