Private Function sumchk(data$) As String '求校验和函数
Dim i&
Dim chk&
For i = 1 To Len(dats)
chk = chk + Asc(Mid(dats, i, 1))
Next i
sumchk = Right(Hex$(chk), 2)
End Function
Private Sub Form_Load() '初始化
MSComm1.PortOpen = True
MSComm1.CommPort = 1
MSComm1.Settings = "9600,e,7,1"
MSComm1.InputLen = 0
MSComm1.InBufferCount = 0
MSComm1.OutBufferCount = 0
Dim sd As String
Dim rd As String
sd = "00" + "FF" + "BR" + "0" + "Y0000" + "08"
MSComm1.Output = Chr$(5) + djsd + sumchk(sd)
Do
DoEvents
Loop Until MSComm1.InBufferCount >= 13
rd = MSComm1.Input
请问PLC返回数据是什么类型的??假设Y0--Y7的值为10110111
PLC返回到VB的缓冲区的值是10110111 还是31H 30H 31H 31H 30H 31H 31H 31H ??
请各位指教!!!
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