橫河SR1B-045N-1KC

橫河SR1B-045N-1KC

命令報文中10F6H為D123的地址，04H表示要讀入4個字節的數據。校驗和SUM＝30H＋31H＋30H＋46H＋36H＋30H＋34H＋03 H＝174H，溢出部分不計，故SUMH=7，SUAIL=4，相應的ASCⅡ碼為“37H”，“34H”。應答報文中4個字節的十六進制數，其相應的ASCⅡ碼為8個字節，故應答報文長度為12個字節。

    根據PC與FX系列PLC的傳輸應答過程，利用VB的MSComm控件可以編寫如下通信程序實現PC與FX系列PLC之間的串行通信，以完成數據的讀取。MSComm控件可以采用輪詢或事件驅動的方法從端口獲取數據。在這個例子中使用了輪詢方法。

   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）請求通信與確認

    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）發送命令報文

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）讀取應答報文

Private Sub ReceiveFrame（）

Dim Instring As String

Do

DoEvents

Loop Until MSComml．InBufferCount = 12

InString = MSComml．Inpult

End Sub

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