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電平上位機波形上位機信號0電平下位機接收波形上行信號測試總線輸出波形下位機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接收波形下位機程序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