ZigBee has the following characteristics:
(1) Low power consumption: Due to the low transmission rate of ZigBee, the transmission power is only 1mW, and it adopts sleep mode and low power consumption, so ZigBee devices are very power efficient. It is estimated that a ZigBee device can last for 6 months to 2 years using only two AA batteries, which is beyond the reach of other wireless devices.
(2) Low cost: The initial cost of the ZigBee module is around US$6, which is expected to drop to US$1.5-2.5 soon, and the ZigBee protocol is patent-free. Low cost is also a key factor for ZigBee.
(3) Short delay: Communication delay and activation delay from sleep state are very short. The typical search device delay is 30ms, the sleep activation delay is 15ms, and the active device channel access The delay is 15ms. Therefore, ZigBee technology is suitable for wireless control applications with stringent latency requirements (such as industrial control occasions, etc.).
(4) Large network capacity: A star-structured Zigbee network can accommodate up to 254 slave devices and one master device. Up to 100 ZigBee networks can exist simultaneously in an area, and the network composition is flexible.
(5) Reliable: It adopts a collision avoidance strategy and reserves dedicated time slots for communication services that require fixed bandwidth, avoiding competition and conflicts in sending data. The MAC layer adopts a fully confirmed data transmission mode, and each data packet sent must wait for confirmation information from the receiver. If there is a problem during the transmission process, it can be resent.
(6) Security: ZigBee provides a data packet integrity check function based on cyclic redundancy check (CRC), supports authentication and authentication, and uses the AES-128 encryption algorithm. Each application can Flexibly determine its security attributes.