外文翻譯數(shù)字化tlg焊機菜單式人機交互系統(tǒng)的研究-預(yù)覽頁
【正文】 、液晶顯示及AMS320F240和AT89C2051的指令執(zhí)行等之間的速度匹配。is detected on Preset item，system enters parameter preset interface，it is in this interface that the operator does preliminary work by the system．When “CONFIRM’’ is detected on Weld item，system enters welding waiting interface．When “CONFIRM” is detected on Exit item．The system will be back to friendly interface. The number of pages regarding parameter preset interface is corresponded to the number of parameters required by welding process．So eight parameters are needed for TIG welding process：PreGas time，PostGas time ascending time of welding current，descending time of welding current，igniting current， welding current，initial current，ending current．The operator can choose parameter pages by“UP” and “DOWN”．When “CONFIRM’’ is detected on some parameter page，system enters parametermodifying interface，the operator can modify the va1ue of the chosen parameter by “UP’’ and “DOWN” until are required keyboard value is set，then the system goes back to parameter preset interface by “CONFIRM”．The operator can use this way to modify values of other parameters until every single parameter is set，then system can be back to menu interface by “MENU”． When the welding torch on detected in welding waiting interface，DSP controls the system to enter welding sit interface in which DSP monitors，samples and controls．The man—machine interaction system displays dynamica11y every moment of welding process and main relevant parameters，meanwhile，title operator can modify the welding current value of working site by “UP”，“DOWN”． The system will be back to the friendly interface automatically at the end of welding process.3 Working principle of mallmachine interaction system in TIG welding machine Hardware principle of manmachine interaction system in TIG welding machine TMS320F240 digital signal processor was used in our research as the main purpose of TIG welding control，and AT89C2051 single—chip processor was dedicated to real time display of welding field by municating with TMS320F240．A display block of liquid crystal based on character，MDLS16465，was used to meet the need of dynamical display. During the process of man—machine interacting，TMS320F240 scans the keyboards in real time．The keyboard scanned can be judged by the keyboard value．After process judgment，corresponding message is sent to AT89C205 1 to display，which will be dynamical display about welding site．During welding，TMS320F240 samples parameters from the working site in real time through A／D,and sends data disposed to AT89C205 1 to display dynamically．The working principle of the manmachine interaction system centered by TMS32017240 is showed in Fig2． The munication between TMS320F240 and AT89C2051 is asynchronous based on software transmits flags and data to AT89C2051 and receives data from AT89C2051 by serial munication based on signals DSPTXD and DSPEXD．The four keys ale arrayed in a line，so a line wire (PC7)and four row wires(DA0DA3)are samples welding voltage and current through ADIN0 and ADIN1． As a data port, the P1 of AT89C2051 sends control bytes and display codes to MDLS16465，AT89C2051 receives flags and data transmitted by TMS320F240， according to flags，displays information according to data．3．2 Programming principle of manmachine inter lion system in TIG welding machine A DSP main
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