MATLAB serial.rar_L1R_MATLAB serical_MATLAB 串口_MATLAB串口_matlab

function chuankou() delete(instrfindall); s=serial('com7'); set(s,'BaudRate',9600,'DataBits',8,'StopBits',1,'Parity','none','FlowControl','none'); s.BytesAvailableFcnMode='byte'; s.InputBufferSize=4096; s.BytesAvailableFcnCount=9; fopen(s); global a b; b=0; s.BytesAvailableFcn=@callback; for i=1:400 pause(1); c=[04 03 00 100 00 02 133 129];%第100个字，实际读PLC中的VB200 fwrite(s,c,'async'); end end function callback(obj,event) a=fread(obj,9);%读取9个字节 b=a(4)*256+a(5) end