Qiao Xiaojun

An improved design of ZigBee Wireless Sensor Network

ZigBee is a low rate, low power consumption wireless communication technology, which can be widely used in the Wireless Sensor Network (WSN). WSN is composed of hundreds of nodes, all of the sensor nodes information in the network will be sent to the coordinator, so the coordinator usually undertake the task to collect sensor data information, conserve the information, process the information, and also as the interface of the network with the user. The coordinator should communicate with the host computer by the upper protocol, so the coordinator carry too much load, especially in the large scale wireless sensor network, which will have an bad effect on the network communication. The effect showed bad real-time, data packet loss, and stability decrease. The paper presents an improved design of ZigBee Wireless Sensor Network. In the network the coordinator only deal with the task on the ZigBee network, the rest tasks will be processed by another processor. The processor connected with the Coordinator by RS-232 interface. All data information will be sent to the processor though the serial port. So the processor undertakes the task to deal with data, conserve the network information, and communicate with the host computer. At last we tested the improved ZigBee wireless network and verification the effect.

Research on ZigBee Wireless Sensors Network Based on ModBus Protocol

The information transmission is transparent for the user in the ZigBee wireless sensors network, which are lack of interactivity and self-constrain. The information in the ZigBee wireless sensors network can not be viewed in a real time by a friendly interface. Modbus protocol is embedded into ZigBee stack, in this way, we can implement interaction well and the information can be viewed in a friendly interface. The paper present the measures to embed the Modbus protocol into the ZigBee stack provided by Chipcon company, which contains address bound mechanism, information centralized storage, and flexible monitoring, by which we can monitor the real time information from the ZigBee wireless network and use some instructions to control the remote device in a friendly interface, which can be used well in the middle and small ZigBee monitoring wireless sensors network. We implement it in the plant physiological ecology monitoring system.