form1.frm

通过串口发送和接收数据,可以实现与单片机通讯

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   4980
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6975
   LinkTopic       =   "Form1"
   ScaleHeight     =   4980
   ScaleWidth      =   6975
   StartUpPosition =   3  '窗口缺省
   Begin MSCommLib.MSComm MSComm1 
      Left            =   4680
      Top             =   3840
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   0   'False
      InBufferSize    =   10
      OutBufferSize   =   10
      RThreshold      =   1
      BaudRate        =   4800
      StopBits        =   2
      InputMode       =   1
   End
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   495
      Left            =   2400
      TabIndex        =   5
      Top             =   3360
      Width           =   1335
   End
   Begin VB.CommandButton Command1 
      Caption         =   "发送"
      Height          =   495
      Left            =   840
      TabIndex        =   4
      Top             =   3360
      Width           =   1215
   End
   Begin VB.TextBox Text2 
      Height          =   1695
      Left            =   1320
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   1
      Top             =   1200
      Width           =   2655
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   1440
      MultiLine       =   -1  'True
      TabIndex        =   0
      Top             =   600
      Width           =   1575
   End
   Begin VB.Label Label2 
      Alignment       =   2  'Center
      Caption         =   "接受"
      Height          =   495
      Left            =   240
      TabIndex        =   3
      Top             =   1320
      Width           =   975
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      Caption         =   "发送"
      Height          =   495
      Left            =   120
      TabIndex        =   2
      Top             =   600
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim i As Integer


Private Sub Mscomm1_Oncomm()
Dim a As String
 Select Case MSComm1.CommEvent
Case comEvReceive
a = MSComm1.Input
Text2.Text = Text2.Text + a
MSComm1.InBufferCount = 0
End Select
End Sub

Private Sub Command1_Click()
Dim a%
a = InputBox("123")
MSComm1.Output = CStr(a)

End Sub
Private Sub Command2_Click()
Unload Me
End Sub

Private Sub Form_Load()
MSComm1.CommPort = 2
MSComm1.Settings = "9600,n,8,1"
MSComm1.PortOpen = True
End Sub