关键词: 计算机应用, 级联型传感器网络, 非对称数据传输通道, 以太网PHY, RS485, 现场可编程门阵列

Abstract:

In cascaded sensor network, data transmission channels of the uplink and downlink are usually asymmetric in data rate. According to this feature, an improved cascaded usage of Ethernet PHY chip was presented. In the uplink channel with higher data rate the Ethernet PHY chip was used as an independent receiver and transmitter; thus, one PHY chip can receive data from downlink node and transmit data to uplink node. The downlink channel with lower data rate was implanted with transceivers which have lower power consumption and lower cost. A Field Programmable Gate Array (FPGA) was used to implement the data link layer of the network. Experiment results show that the in practical application this design can satisfy the tradeoff between low power consumption and high data rate.

Key words: computer application, cascaded sensor network, asymmetry data transmission channel, Ethernet PHY, RS485, FPGA