be01仪表通讯.frm

一个小型的称重管理系统,有托利多BE01通讯接口和磅单打印功能.

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3090
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3090
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   375
      Left            =   240
      TabIndex        =   3
      Top             =   1800
      Width           =   855
   End
   Begin VB.TextBox Text3 
      Height          =   375
      Left            =   3120
      TabIndex        =   2
      Text            =   "Text3"
      Top             =   1080
      Width           =   1215
   End
   Begin VB.TextBox Text2 
      Height          =   375
      Left            =   1800
      TabIndex        =   1
      Text            =   "Text2"
      Top             =   1080
      Width           =   1095
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   360
      TabIndex        =   0
      Text            =   "Text1"
      Top             =   1080
      Width           =   1215
   End
   Begin MSCommLib.MSComm MSC 
      Left            =   360
      Top             =   240
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim Out(17) As Byte '接收var中的值
Dim var As Variant '接收MSC.input中的数值
Dim nRece As Integer '计算MSC.inputbuffer的个数
Dim i As Integer, j As Integer '随即变量，计算循环

Private Sub Form_Load()

  ClearText
  With MSC
    .CommPort = 1 '设置Com1为通信端口
    .Settings = "1200,n,8,1" '设置通信端口参数 9600赫兹、偶校验、7个数据位、1个停止位.（这里需要进一步说明的是tting="BBBB,P,D,S"。
    '含义是：B：Baud Rate（波特率）；P：Parity（奇偶）；D：Data Bit；S：Stop Bit）

    .InBufferSize = 40 '设置缓冲区接收数据为40字节
    .InputLen = 1 '设置Input一次从接收缓冲读取字节数为1
    .RThreshold = 1 '设置接收一个字节就产生OnComm事件

  End With

End Sub


Private Sub ClearText()
  Text3.Text = ""
  Text2.Text = "5"
  Text1.Text = ""
End Sub

Private Sub Command1_Click()
  ClearText
  ' nRece = 0 '计数器清零
  With MSC
    .InputMode = comInputModeBinary '设置数据接收模式为二进制形式
    .InBufferCount = 0 '清除接收缓冲区
    If Not .PortOpen Then
      .PortOpen = True '打开通信端口
    End If
  End With
End Sub

Private Sub MSC_OnComm()
  DelayTime '用来延续时间
  ClearText
  With MSC
    Select Case .CommEvent '判断通信事件
    Case comEvReceive: '收到Rthreshold个字节产生的接收事件
      SwichVar 1
      If Out(1) = 2 Then '判断是否为数据的开始标志
        .RThreshold = 0 '关闭OnComm事件接收
      End If
      Do
        DoEvents
      Loop Until .InBufferCount >= 3 '循环等待接收缓冲区>=3个字节
       nRece = nRece + 1
      For i = 2 To 12
        SwichVar i
        Text1.Text = Text1.Text & Chr(Out(i))
      Next
      Text1.Text = LTrim(Text1.Text)
      Text2.Text = Text2.Text & CStr(nRece)
      .RThreshold = 1 '打开MSComm事件接收
    Case Else
       .PortOpen = False
    End Select
  End With

End Sub

Private Sub DelayTime()

  Dim bDT As Boolean
  Dim sPrevious As Single, sLast As Single

  bDT = True

  sPrevious = Timer '(Timer可以计算从子夜到现在所经过的秒数，在Microsoft Windows中，Timer函数可以返回一秒的小数部分)

  Do While bDT
    If Timer - sPrevious >= 0.3 Then bDT = False
  Loop
  bDT = True

End Sub

Private Sub SwichVar(ByVal nNum As Integer)

  DelayTime
  var = Null
  var = MSC.Input
  Out(nNum) = var(0)

End Sub

Private Sub Text1_Change()

  Text3.Text = CText(Text1.Text) - CText(Text2.Text)

End Sub


Private Function CText(ByVal str As String) As Currency

  If str <> "" Then
    CText = CCur(Val(str))
  Else
    CText = 0
  End If

End Function