MSComm接收转换问题

[please0415]

Dim bb As Integer
Dim cc As String
Dim newStr As Variant

Dim var As Variant

var = MSComm1.Input
bb = AscW(Mid(var, 11, 1))

上面是部分代码,我是要实现从设备里读出数据,并把读出的数做加或减等数据运算.上面使用ASC时只能在0-127之前做加减运算,128-255间的数被读出后如何转换成能进行算术运算的值.

[zdingyun]

LZ:须按2进制方式接收:

Option Explicit
    Dim strData As String

Private Sub Form_Load()
    MSComm1.Settings = "9600,N,8,1"
    MSComm1.RThreshold = 1
    MSComm1.InputMode = comInputModeBinary
    MSComm1.PortOpen = True
End Sub

Private Sub MSComm1_OnComm()
    Dim BytReceived() As Byte
    Select Case MSComm1.CommEvent
        Case 2
            MSComm1.InputLen = 0
            BytReceived() = MSComm1.Input
            Dim i As Integer
            For i = 0 To UBound(BytReceived)
                If Len(Hex(BytReceived(i))) = 1 Then
                    strData = strData & "0" & Hex(BytReceived(i))
                Else
                    strData = strData & Hex(BytReceived(i))
                End If
            Next
            '按通信协议写接收数据处理代码
     End Select
End Sub

接收的BYTE数组转换为16进制字符串形式,待按通信协议进行数据处理.

[kingsang]

d

[PERFECTLXY]

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