1）通信口初始化

    Private Sub Initialize（）

    MSComm1．CommPort =1

    MSComm1．Settings = “9600,E,7,1”

    MSComm1．InBufferSize = 1024

    MSComml．OutBuffersize = 1024

    MSComm1．InputLen = 0

    MSComml．InputMode = comInputText

    MSComm1．Handshaking = comNone

    MSComm1．PortOpen = True

    End Sub

    2）请求通信与确认

    Private Function MakeHandshaking（）As Boolean

    Dim InPackage As String

    MSComml．OutBufferCount = 0

MSComml．InBufferCount = 0

MSComml．OutPut = Chr（＆H5）

Do

DoEvents

Loop Until MSComml．InBufferCount = 1

InPackage = MSComml．Input

If InPackage = Chr（＆H6） Then

MakeHandShaking = True

Else

MakeHandshaking = False

End If

End Function

3）发送命令报文

Private Sub SendFrame ()

Dim Outstring As String

MSComml．OutBufferCount = 0

MSComml．InBufferCount = 0

Outstrin = Chr（＆H2）＋″on″＋″10F604″＋Chr（＆H3）＋″74″

MSComml．Output = Outstring

End Sub

4）读取应答报文

Private Sub ReceiveFrame（）

Dim Instring As String

Do

DoEvents

Loop Until MSComml．InBufferCount = 12

InString = MSComml．Inpult

End Sub