请教 PLC返回VB的是什么类型的数据

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!!!

是B7，也就是42 37 但还有起始停止和检验位

多谢指教!!!

学习了谢谢分享