現(xiàn)場節(jié)點數(shù)據(jù)傳輸課件

實驗4實驗名稱：現(xiàn)場節(jié)點數(shù)據(jù)傳輸實驗一實驗?zāi)康?了解主從式測控網(wǎng)絡(luò)的基本構(gòu)成方法；2掌握現(xiàn)場節(jié)點數(shù)據(jù)傳輸?shù)幕驹恚?掌握字符串收發(fā)和分析判斷的實現(xiàn)方法；2實驗內(nèi)容1下行數(shù)據(jù)調(diào)制（波特率9600）測試調(diào)制電路的輸入輸出波形，畫出測試結(jié)果；2下行信號的接收測試下行信號變換電路的波形，畫出測試結(jié)果；3上行信號調(diào)制測試上行信號調(diào)制波形，畫出測試結(jié)果；4上行信號接收電路測試上行信號各點的波形，畫出測試結(jié)果；5請求－應(yīng)答關(guān)系設(shè)計

設(shè)計命令字符串格式，修改下位機(jī)接收處理程序，測試控制傳輸結(jié)果。命令格式變成：地址字符＋命令字符＋數(shù)據(jù)字符

如:接收到“1A”輸出“OK”接收到“1S1”將P1端口置位,返回“OK”接收到“1C1”將P1端口復(fù)位,返回“OK”傳輸電路下行信號調(diào)制測試總線輸出波形總線0電平上位機(jī)波形上位機(jī)信號0電平下位機(jī)接收波形上行信號測試總線輸出波形下位機(jī)輸出信號電流檢測波形整形輸出波形下行命令波形波形時序關(guān)系上行數(shù)據(jù)波形下行命令波形電流檢測波形上位機(jī)接收波形下位機(jī)程序COM:PUSH00PUSHAJBRI,COMRCLRTIJNB71H,TE1MOVR0,40HCJNER0,#4FH,COMT1MOVSBUF,#0DHCLR71HAJMPCOMECOMT1:MOVA,@R0MOVSBUF,AINC40HCJNEA,#0DH,TE1MOV40H,#41HCLR71HTE1:AJMPCOMECOMR:CLRRIMOVA,SBUFMOVR0,50HMOV@R0,AINC50HCJNEA,#0DH,COMEMOV50H,#51HSETB70HCOME:POPAPOP00HRETI串行接口字符串接收方式程序命令描述命令SX將PX端口置位,返回SXOK命令CX將PX端口復(fù)位,返回CXOK命令WXX將XX寫入P1端口，返回OK命令R返回P1=端口值命令A(yù)返回“OK”置位命令分析程序SSET:MOVA,52HCJNEA,#30H,SS1SETBP1.0AJMPSSESS1:CJNEA,#31H,SS2SETBP1.1AJMPSSESS2:CJNEA,#32H,SS3SETBP1.2AJMPSSESS3:CJNEA,#33H,SS4SETBP1.3AJMPSSESS4:CJNEA,#34H,SS5SETBP1.4AJMPSSESS5:CJNEA,#35H,SS6SETBP1.5AJMPSSESS6:CJNEA,#36H,SS7SETBP1.6AJMPSSESS7:CJNEA,#37H,SS8SETBP1.7AJMPSSESS8:LCALLSTRERETSSE:MOV41H,#'S'MOV42H,52H