DC总线烟雾探测器介绍-D-Win.DOC

DC总线烟雾探测器介绍 系统总览 此烟雾探测器(DC-SD) 网络设计用来满足欧洲的7FP Scarlett 项目的一部分.此系统是基于 SIG60 和 SIG61 两颗芯片. 此芯片在一些列的传感器和执行器器之间通过DC总线技术在电源线上通信,减少线束的尺寸和重量,继而减少安装难度. The DC-SD can connect up to 16 nodes per network. Several networks may operate simultaneously over the same DC powerline, using different carrier frequencies. The DC-SD demonstrator in SCARLETT consists of four smoke detectors. Two versions of devices are used in the DC-SD; The SIG60 operates as a general purpose DC powerline UART transceiver used by the Master unit to communicate between the RDC and variety of remote sensors and actuators such as the smoke detectors. The device has most of the circuitry required for proper operation, occupying very small foot print. The device operates either as the bus master or as a slave. The SIG61 device operates as smart slave with built-in eight output ports and eight input ports(8个输入输出脚). Each device has its own configured address. The device receives a Write command from a Master (SIG60) to activate its output pins. The Read command from the master reads the status of its eight input pins and sends it as a digital data back to the master. Each of the DC-SD’s has the device as its main building block. Figure 2.1 – 烟雾探测器网络模块图 Figure 2.1a – 烟雾探测器系统 The SIG60 modules and the SIG61 Independent Slave modules are built to interface between any uC and its sensors and actuators. Both are based on the corresponding semiconductors devices: The simple UART interface allows transmission of any number of bytes with a fixed latency of 3.5 bits. A Sleep mode saves power when device is not used. Wakeup messages on the DC line awaken remote devices. The SIG60 device is designed to overcome the hostile communication conditions of a avionic power line. It consists of a unique DC-BUS Modem, Coder/Decoder and a Communication Controller overcoming the hostile environment over vehicle battery lines. Sleep mode reduces the power consumption when there is no bus activity. The switching power supply provid