摘要
设计了一种公路收费站收费终端机,它具有收费输入、栏杆控制、车辆自动计数、语音提示、数码显示、视频叠加等功能。主要部件由 8031 单片机、非易失存储器 HK1235、语音芯片ISD2590、日历时钟芯片 DS12887、可编程接口芯片 8255、键盘显示接口芯片 8279、复位控制芯片MX708等组成。该收费终端机可随时接受上位机指令,实现数据传送、时钟校准、收费标准修改及收费工作人员密码传送等,采用大容量非易失存储器,能较长时间地脱机独立工作,并保证掉电时数据不丢失。
A terminal unit for road tollgates is designed.It is able to record the charge and to control the baluster.It can automatically take count of cars and it also has these functions as followed:voice reminding,numerical display and video superposition.It consists of a microcontroller 8031,a nonvolatile memorizes HK1235,a real time clock chip DS12887,a voice record/playback chip ISD2590,a programmable peripheral interface 8255,a programmable keyboard/display interface 8279 and a μp supervisory circuit MX708.The terminal unit can receive orders from the upper computer at anytime and can transmit data to the upper computer.And it can calibrate the time clock,alter the charge standard and transmit the toll collectors' codes.Because of the use of the HK1235 nonvolatile static RAM,the terminal unit can work independently without the upper computer for a long time,and it never loses data when the power is cut-off.
出处
《河北工业科技》
CAS
2005年第1期25-27,共3页
Hebei Journal of Industrial Science and Technology
