For industrial wireless communication 2.4GHZ and Ethernet communication technology, a ZigBee industrial Ethernet gateway based on embedded ARM9 processor is designed. The gateway hardware uses AT91SAM9260 processor and Zigbee/IEEE802.15.4 wireless RF transceiver device CC2520. The software design is based on Linux. The kernel, the application layer is implemented by the ZigBee protocol, and the embedded WebServer is embedded in the gateway to realize remote data interaction of the field instrument.
introduction
At present, the application of multi-standard multi-protocol coexistence is increasing, and the gateway functioning as a bridge for protocol conversion plays a key role. Currently, two local wireless technologies are undoubtedly Wi-Fi and Bluetooth, but for low power consumption and low bandwidth. Control applications, such as sensor networks in factories, ZigBee may be a better choice. Equipped with a powerful processor, ZigBee can efficiently perform many complex applications with low power consumption and low bandwidth.
ZigBee has become one of the most popular technologies in industrial wireless communication technology due to its low cost, low power consumption and flexible networking. ZigBee is a low-speed network with a transmission speed of 10KB/S to 250KB/S. The various interconnection methods make the networking mode flexible and robust.
This paper introduces a ZigBee industrial Ethernet gateway design based on AT91SAM9260, which realizes a transparent access of ZigBee and industrial Ethernet. The upper layer adopts ZigBee protocol, which is applied to industrial field short-distance wireless control, monitoring, data transmission and other Ethernet. Protocol conversion, embedded embedded WebServer to achieve remote monitoring of field instruments, remote data interaction system application block diagram shown in Figure 1. Users can directly access or modify the instrument data through the ZigBee Ethernet gateway embedded WebServer to achieve remote remote instrumentation Monitoring, remote diagnosis, etc. When the gateway is connected to GPRS or the Internet, you can access industrial field instrument data at any time, no matter where you are, to realize remote configuration, remote diagnosis and remote operation of field instruments, making it worldwide. Different sensor monitoring networks can share information.
Figure 1 Schematic diagram of ZigBee Ethernet gateway application
Bi Directions Thyristor (Triac) is equivalent to the antiparallel connection of two unidirectional thyristors, but only one control pole.
Bidirectional thyristors are made of N-P-N-P-N five-layer semiconductor materials, and three electrodes are also derived from the outside. Its structure is shown in the figure. Bi-directional thyristor volt-ampere characteristic curve Since the forward and reverse characteristics of the bidirectional thyristor are symmetrical, it can be turned on in any direction and is an ideal AC switching device.
Bi Directions Thyristor (Triac)
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