form1.frm

本程序用VB串口实现L了电源供应器的控制

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "电源供应器的控制"
   ClientHeight    =   5010
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6855
   LinkTopic       =   "Form1"
   ScaleHeight     =   5010
   ScaleWidth      =   6855
   StartUpPosition =   3  '窗口缺省
   Begin VB.TextBox Text2 
      BeginProperty Font 
         Name            =   "Times New Roman"
         Size            =   12
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   480
      Left            =   90
      TabIndex        =   10
      Top             =   2025
      Width           =   3135
   End
   Begin VB.CommandButton Command3 
      Caption         =   "设置电压"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   3780
      TabIndex        =   9
      Top             =   2430
      Width           =   1725
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "Times New Roman"
         Size            =   12
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   1335
      Left            =   90
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   6
      Text            =   "Form1.frx":0000
      Top             =   3030
      Width           =   3135
   End
   Begin VB.CommandButton Command1 
      Caption         =   "送出命令"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   3780
      TabIndex        =   5
      Top             =   1170
      Width           =   1725
   End
   Begin VB.CommandButton Command2 
      Caption         =   "结束系统"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   855
      Left            =   3780
      TabIndex        =   4
      Top             =   3735
      Width           =   1725
   End
   Begin VB.TextBox txtCmd 
      BeginProperty Font 
         Name            =   "Times New Roman"
         Size            =   12
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   480
      Left            =   90
      TabIndex        =   3
      Top             =   990
      Width           =   3135
   End
   Begin VB.Frame Frame1 
      Caption         =   "选择串行端口"
      Height          =   732
      Left            =   3555
      TabIndex        =   0
      Top             =   135
      Width           =   2652
      Begin VB.OptionButton optCom 
         Caption         =   "COM2"
         Height          =   252
         Index           =   1
         Left            =   1584
         TabIndex        =   2
         Top             =   336
         Value           =   -1  'True
         Width           =   855
      End
      Begin VB.OptionButton optCom 
         Caption         =   "COM1"
         Height          =   252
         Index           =   0
         Left            =   384
         TabIndex        =   1
         Top             =   336
         Width           =   855
      End
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   5940
      Top             =   1350
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
      RThreshold      =   1
      BaudRate        =   2400
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "电压设置区"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   240
      Index           =   1
      Left            =   225
      TabIndex        =   11
      Top             =   1665
      Width           =   1200
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "返回字符串"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   240
      Index           =   2
      Left            =   135
      TabIndex        =   8
      Top             =   2655
      Width           =   1200
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "命令输入区"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   240
      Index           =   0
      Left            =   225
      TabIndex        =   7
      Top             =   630
      Width           =   1200
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
''''''''''''''''''''''''''''''''''''''''''''''
'使用按钮控件
'将命令分成一个一个的字符，再使用Output属性送出
'每一个字符间延迟50毫秒
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Command1_Click()
  Dim Buf$, BufLen%, i%, PowerDelay&
  PowerDelay = 50
  Buf = CStr(Trim(txtCmd.Text))
  BufLen = Len(Buf)
  For i = 1 To BufLen
    MSComm1.Output = Mid(Buf, i, 1): TimeDelay PowerDelay
  Next i
  MSComm1.Output = Chr(13)
End Sub

''''''''''''''''''''''''''''''''''''''''''''''
'使用按钮控件
'结束系统
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Command2_Click()
  End
End Sub

''''''''''''''''''''''''''''''''''''''''''''''
'使用按钮控件
'选择波道，设置电压，并将设置的波道打开以输出
'数值的设置有一定的格式，此点必须注意
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Command3_Click()
  Dim PowerDelay&
  Dim SetVoltage!, Buf$, BufLen%
  
  PowerDelay = 50
  SetVoltage = Val(Text2.Text)
  If SetVoltage = 0 Then
      MSComm1.Output = "C": TimeDelay PowerDelay
      MSComm1.Output = "H": TimeDelay PowerDelay
      MSComm1.Output = "A": TimeDelay PowerDelay
      MSComm1.Output = "N": TimeDelay PowerDelay
      MSComm1.Output = "1": TimeDelay PowerDelay
      MSComm1.Output = Chr(13)
      TimeDelay 100
      MSComm1.Output = "o": TimeDelay PowerDelay
      MSComm1.Output = "u": TimeDelay PowerDelay
      MSComm1.Output = "t": TimeDelay PowerDelay
      MSComm1.Output = "0": TimeDelay PowerDelay
      MSComm1.Output = Chr(13)
      Exit Sub
  End If
  
      MSComm1.Output = "C": TimeDelay PowerDelay
      MSComm1.Output = "H": TimeDelay PowerDelay
      MSComm1.Output = "A": TimeDelay PowerDelay
      MSComm1.Output = "N": TimeDelay PowerDelay
      MSComm1.Output = "1": TimeDelay PowerDelay
      MSComm1.Output = Chr(13)
      TimeDelay 100
      MSComm1.Output = "v": TimeDelay PowerDelay
      MSComm1.Output = "s": TimeDelay PowerDelay
      MSComm1.Output = "e": TimeDelay PowerDelay
      MSComm1.Output = "t": TimeDelay PowerDelay
      MSComm1.Output = "1": TimeDelay PowerDelay
      MSComm1.Output = "  ": TimeDelay PowerDelay
      Buf = Trim(Format(SetVoltage, "00.00"))
      BufLen = Len(Buf)
      For i = 1 To BufLen
   MSComm1.Output = Mid(Buf, i, 1): TimeDelay PowerDelay
      Next i
      MSComm1.Output = Chr(13)
      TimeDelay 100
      MSComm1.Output = "o": TimeDelay PowerDelay
      MSComm1.Output = "u": TimeDelay PowerDelay
      MSComm1.Output = "t": TimeDelay PowerDelay
      MSComm1.Output = "1": TimeDelay PowerDelay
      MSComm1.Output = Chr(13)

End Sub

''''''''''''''''''''''''''''''''''''''''''''''
'窗体的加载事件
'开放通信端口
'若打开错误亦通知用户
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub Form_Load()
  Text1.Text = ""
  On Error Resume Next
  MSComm1.PortOpen = False
  MSComm1.CommPort = Index + 1
  If MSComm1.PortOpen Then
    MsgBox "所选的串行端口已被其他设备所使用!", vbExclamation + vbOKOnly, "系统信息"
    Exit Sub
  Else
    MSComm1.PortOpen = True
  End If

End Sub

''''''''''''''''''''''''''''''''''''''''''''''
'通信控件的OnComm事件程序
'引发事件后，将返回的字符串显示在显示区中
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub MSComm1_OnComm()
  Select Case MSComm1.CommEvent
      ' 借着取代底下每一个 case 语句来处理每个事件与错误
   ' 事件
     Case comEvCD    ' CD 线的状态发生变化.
     Case comEvCTS   ' CTS 线的状态发生变化.
     Case comEvDSR   ' DSR 线的状态发生变化.
     Case comEvRing  ' Ring Indicator 变化.
     Case comEvReceive   ' 收到 RThreshold # of
        Text1.Text = Text1.Text & MSComm1.Input
     Case comEvSend  ' 传输缓存区有 Sthreshold 个字符        '
      End Select

End Sub

''''''''''''''''''''''''''''''''''''''''''''''
'使用Option控件
'让用户选择另外的通信端口，并打开它
'若无法打开，亦通知用户此情形
'''''''''''''''''''''''''''''''''''''''''''''
Private Sub optCom_Click(Index As Integer)
  On Error Resume Next
  MSComm1.PortOpen = False
  MSComm1.CommPort = Index + 1
  If MSComm1.PortOpen Then
    MsgBox "所选的串行端口已被其他设备所使用!", vbExclamation + vbOKOnly, "系统信息"
    Exit Sub
  Else
    MSComm1.PortOpen = True
  End If

End Sub