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用VB编制的电脑与PLC-R232通讯的调试程序

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   " 上 位 机 通 讯 程 序"
   ClientHeight    =   5448
   ClientLeft      =   60
   ClientTop       =   348
   ClientWidth     =   6648
   ForeColor       =   &H000000FF&
   LinkTopic       =   "Form1"
   ScaleHeight     =   5448
   ScaleWidth      =   6648
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton 停止通讯 
      Caption         =   "停 止通讯"
      Height          =   492
      Left            =   4920
      TabIndex        =   11
      Top             =   1200
      Width           =   1332
   End
   Begin VB.Timer Timer1 
      Interval        =   1000
      Left            =   5760
      Top             =   360
   End
   Begin VB.OptionButton Option1 
      Caption         =   "com2"
      Height          =   375
      Left            =   3480
      TabIndex        =   9
      Top             =   1080
      Width           =   2295
   End
   Begin VB.OptionButton com1 
      Caption         =   "com1"
      Height          =   495
      Left            =   3480
      TabIndex        =   8
      Top             =   480
      Value           =   -1  'True
      Width           =   2175
   End
   Begin VB.CommandButton Command2 
      BackColor       =   &H00FF8080&
      Caption         =   "清除"
      Height          =   375
      Left            =   1680
      TabIndex        =   7
      Top             =   4680
      Width           =   1335
   End
   Begin VB.TextBox Text3 
      BackColor       =   &H00C0C0FF&
      Height          =   852
      Left            =   1680
      MultiLine       =   -1  'True
      TabIndex        =   6
      Top             =   3600
      Width           =   3015
   End
   Begin VB.TextBox Text2 
      BackColor       =   &H00FFFFC0&
      Height          =   375
      Left            =   1680
      TabIndex        =   3
      Top             =   360
      Width           =   1215
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   360
      Top             =   1200
      _ExtentX        =   995
      _ExtentY        =   995
      _Version        =   393216
      DTREnable       =   -1  'True
      RThreshold      =   1
      ParitySetting   =   2
      DataBits        =   7
      StopBits        =   2
   End
   Begin VB.TextBox Text1 
      BackColor       =   &H80000018&
      ForeColor       =   &H80000001&
      Height          =   972
      Left            =   1680
      MultiLine       =   -1  'True
      TabIndex        =   1
      Top             =   2040
      Width           =   3015
   End
   Begin VB.CommandButton Command1 
      Caption         =   "  通 讯按 钮"
      Height          =   495
      Left            =   1680
      TabIndex        =   0
      Top             =   1200
      Width           =   1335
   End
   Begin VB.Frame Frame1 
      Caption         =   "端口设定"
      Height          =   1455
      Left            =   3120
      TabIndex        =   10
      Top             =   240
      Width           =   1575
   End
   Begin VB.Label Label3 
      Caption         =   "发送数据"
      Height          =   495
      Left            =   240
      TabIndex        =   5
      Top             =   3840
      Width           =   1215
   End
   Begin VB.Label Label2 
      Caption         =   "FCS校验"
      Height          =   255
      Left            =   240
      TabIndex        =   4
      Top             =   480
      Width           =   975
   End
   Begin VB.Label Label1 
      Caption         =   "接收数据"
      Height          =   255
      Left            =   240
      TabIndex        =   2
      Top             =   2280
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub com1_Click()
MSComm1.CommPort = 1
End Sub

Private Sub Command1_Click()
Me.Timer1.Enabled = True

End Sub
Private Sub Command2_Click()
Text1.Text = ""
Text2.Text = ""
Text3.Text = ""
End Sub

Private Sub Form_Load()
Text3.Text = "@00RD05000001"
End Sub

Private Sub MSComm1_OnComm()
Select Case MSComm1.CommEvent
Case comEvReceive
    temp = temp & MSComm1.Input
    If temp <> "" Then Text1.Text = Text1.Text + temp
    Me.Refresh
End Select

End Sub

Private Sub Option1_Click()
If Me.MSComm1.PortOpen = True Then
Me.MSComm1.PortOpen = False
End If
MSComm1.CommPort = 2
End Sub

Private Sub Timer1_Timer()
Dim FcsResult As String
  Dim StrIn As String
  Dim jytemp As Integer
  Dim temp As String
  jytemp = 0
  StrIn = Text3.Text
  Text1.Text = ""
  '************** 校 验
  For i = 1 To Len(StrIn)
   jytemp = Asc(Mid$(StrIn, i, 1)) Xor jytemp
  Next i
  
  FcsResult = Hex$(jytemp)
  '**************
  Text2.Text = FcsResult
  
  If (MSComm1.PortOpen = False) Then MSComm1.PortOpen = True
  MSComm1.Output = Text3.Text + Text2.Text + "*" + Chr(13)
End Sub

Private Sub 停止通讯_Click()
Me.Timer1.Enabled = False

End Sub