VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form RS232_VB 
   Caption         =   "串口調試器"
   ClientHeight    =   5190
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   7155
   Icon            =   "串口通迅V0.1.frx":0000
   LinkTopic       =   "Form1"
   ScaleHeight     =   5190
   ScaleWidth      =   7155
   StartUpPosition =   2  '屏幕中心
   Begin MSCommLib.MSComm MSComm 
      Left            =   240
      Top             =   2280
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
   End
   Begin VB.CommandButton Button_RECV_C 
      Caption         =   "清空接收文本框"
      Height          =   375
      Left            =   2640
      TabIndex        =   6
      Top             =   4680
      Width           =   1575
   End
   Begin VB.CommandButton Button_SEND_C 
      Caption         =   "清空發送數據"
      Height          =   375
      Left            =   4440
      TabIndex        =   5
      Top             =   2280
      Width           =   1335
   End
   Begin VB.CommandButton Button_SEND 
      Caption         =   "發送數據"
      Height          =   375
      Left            =   1800
      TabIndex        =   4
      Top             =   2280
      Width           =   1215
   End
   Begin VB.TextBox Text_RECV 
      Height          =   1575
      Left            =   1200
      TabIndex        =   1
      Top             =   2880
      Width           =   5535
   End
   Begin VB.TextBox Text_SEND 
      Height          =   1695
      Left            =   1200
      TabIndex        =   0
      Top             =   360
      Width           =   5535
   End
   Begin VB.Label Label3 
      AutoSize        =   -1  'True
      Caption         =   "作者：zjz868@163.com"
      Height          =   180
      Left            =   5160
      TabIndex        =   7
      Top             =   4920
      Width           =   1800
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "接收數據"
      Height          =   180
      Left            =   240
      TabIndex        =   3
      Top             =   3720
      Width           =   720
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "發送數據"
      Height          =   180
      Left            =   240
      TabIndex        =   2
      Top             =   840
      Width           =   720
   End
End
Attribute VB_Name = "RS232_VB"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False


Private Sub Button_RECV_C_Click()
    Text_RECV.Text = ""
    Text_SEND.SetFocus
End Sub

Private Sub Button_SEND_C_Click()
    Text_SEND.Text = ""
    Text_SEND.SetFocus
End Sub

Private Sub Button_SEND_Click() ' 發送數據
    Dim X As String
    If Text_SEND.Text = "" Then '發送不能為空
    X = MsgBox("發送數據不能為空", 16)
        Exit Sub
        End If
    If Not MSComm.PortOpen Then
        MSComm.PortOpen = True
    End If
        MSComm.Output = Text_SEND.Text + Chr$(13) '發送數據
        For i = 1 To 2000000 '延時
        Next
End Sub

Private Sub Form_Load()
    MSComm.CommPort = 1 '設置串口1
    MSComm.Settings = "9600,n,8,1" '波特率9600bit/s,無效驗，8位數據，1位停止位
    MSComm.InputLen = 0 '讀取接收緩沖區的所有字符
    MSComm.InBufferSize = 1024 '設置接收緩沖區為1024字節
    MSComm.OutBufferSize = 512 '設置發送緩沖區為512字節
    MSComm.PortOpen = True '打開串口
    MSComm.SThreshold = 0 '不觸發事件
    MSComm.RThreshold = 1 '每一個字符到接收緩沖區都觸發接收事件
    MSComm.InBufferCount = 0 '清除發送區的數據
    MSComm.OutBufferCount = 0 '清除接收區的緩沖區數據
    
    Text_SEND.Text = "" '清空發送文本
    Text_RECV.Text = "" '清空接收文本
End Sub

Private Sub MSComm_OnComm()
    Select Case MSComm.CommEvent '檢驗串口事件
                                '錯誤處理
    Case comEventOverrun '   數據丟失
        Text_SEND.Text = "" '清空發送緩沖區
        Text_RECV.Text = "" '清空接收緩沖區
        Text_SEND.SetFocus
        Exit Sub
    Case comEventRxOver '接收緩沖區溢出
        Text_SEND.Text = "" '清空發送緩沖區
        Text_RECV.Text = "" '清空接收緩沖區
        Text_SEND.SetFocus
        Exit Sub                '事件處理
    Case comEventTxFull  '發送緩沖區已滿
        Text_SEND.Text = "" '清空發送緩沖區
        Text_RECV.Text = "" '清空接收緩沖區
        Text_SEND.SetFocus
        Exit Sub                '事件處理
    Case comEvReceive  '接收緩沖區有數據
        Dim str As String
        str = MSComm.Input  '從接收隊列中讀入字符串
        Text_RECV.Text = Text_RECV.Text + str '讀出字符串送顯
        End Select
End Sub