外文翻译--一种新的可燃气体报警系统的设计与实现(编辑修改稿)

外文翻译--一种新的可燃气体报警系统的设计与实现(编辑修改稿)内容摘要：

t. The main controller municates with CAN/485 controllers based on CAN bus and CAN/485 controller municates with gas detectors and linkage modules based on RS485 bus. Designed maximum number of CAN/485 converter is 32 and it can have 33 gas detectors or linkage modules under each CAN/485 converter. Using this structure, the system ensures the stability and the capacity of detectors reach 1024, so the system can meet the requirements of most customers. Sensor of gas detector detects gas concentration and switches to a 0V5V voltage signal. Then detector analyzes and processes data, converts into the corresponding data format. Detectors transmit data to corresponding CAN/485 converter based on RS485 bus. In addition, gas detectorrealizes functions such as zeroing, calibration, addresses modification and so on. Relay on linkage module controls gas pipeline opening and closing of valves or exhaust fan when the linkage module is set to link with detector and the detector has alarmed, and thus in time to avoid accidents. CAN/485 converter selects ATMega16 MCU as the microcontroller. It receives data from gas detectors and linkage modules and municates with the main controller based on CAN bus. It also must plete functions such as responding and analyzing mands of the main controller, transferring mands to gas detectors and linkage modules to plete specific tasks. In the design of the system, the main controller is most important and difficult part. Its structure is showed as the one hand, displaying realtime concentration information, on another hand, responding touch screen to realize query function, setting function etc. the main controller mainly includes CAN munication module, HMI, printer module, memory module, alarm module, power module etc. A inch intelligent color LCD display terminal which municate with MCU based on RS232 is used as HMI. It is easy and attractive to program, and plex interface is easier to realized. UPA16PZ miniprinter which connects with Atmega128 based on parallel port can print historical alarming record, fault record, turning off and opening records. The main controller extends 32KB E2PROM to record historical and system parameters and 32KB SDRAM to record realtime concentration information. Power module’s functions are to convert voltage and detect mercial power, backup power and charging status.III. HARDWARE DESIGN OF THE GAS ALARM SYSTEMA. Main Controller Part The circuit of the main controller mainly includes two parts: power circuit, microcontroller and various I/O modules. The power circuit mainly realizes two functions: convert 24V to 5V based on LM2575 switching voltage regulator。 power monitoring. Using pulse method to detect mercial power, backup power and charging status. The design of various I/O modules is another key point. The schematic diagram is showed as . ATmega128, a low power CMOS 8bit MCU is used as the microcontroller and it uses RISC architecture. It includes 128KB flash, TWI, SPI, JTAG interface (used as。