串口通迅v0.1.frm

串口通讯程序

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form RS232_VB 
   Caption         =   "串口调试器"
   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         =   "清空发送数据"
      Height          =   375
      Left            =   4440
      TabIndex        =   5
      Top             =   2280
      Width           =   1335
   End
   Begin VB.CommandButton Button_SEND 
      Caption         =   "发送数据"
      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：[e-mail]"
      Height          =   180
      Left            =   5160
      TabIndex        =   7
      Top             =   4920
      Width           =   1800
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "接收数据"
      Height          =   180
      Left            =   240
      TabIndex        =   3
      Top             =   3720
      Width           =   720
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "发送数据"
      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() ' 发送数据
    Dim X As String
    If Text_SEND.Text = "" Then '发送不能为空
    X = MsgBox("发送数据不能为空", 16)
        Exit Sub
        End If
    If Not MSComm.PortOpen Then
        MSComm.PortOpen = True
    End If
        MSComm.Output = Text_SEND.Text + Chr$(13) '发送数据
        For i = 1 To 2000000 '延时
        Next
End Sub

Private Sub Form_Load()
    MSComm.CommPort = 1 '设置串口1
    MSComm.Settings = "9600,n,8,1" '波特率9600bit/s,无效验，8位数据，1位停止位
    MSComm.InputLen = 0 '读取接收缓冲区的所有字符
    MSComm.InBufferSize = 1024 '设置接收缓冲区为1024字节
    MSComm.OutBufferSize = 512 '设置发送缓冲区为512字节
    MSComm.PortOpen = True '打开串口
    MSComm.SThreshold = 0 '不触发事件
    MSComm.RThreshold = 1 '每一个字符到接收缓冲区都触发接收事件
    MSComm.InBufferCount = 0 '清除发送区的数据
    MSComm.OutBufferCount = 0 '清除接收区的缓冲区数据
    
    Text_SEND.Text = "" '清空发送文本
    Text_RECV.Text = "" '清空接收文本
End Sub

Private Sub MSComm_OnComm()
    Select Case MSComm.CommEvent '检验串口事件
                                '错误处理
    Case comEventOverrun '   数据丢失
        Text_SEND.Text = "" '清空发送缓冲区
        Text_RECV.Text = "" '清空接收缓冲区
        Text_SEND.SetFocus
        Exit Sub
    Case comEventRxOver '接收缓冲区溢出
        Text_SEND.Text = "" '清空发送缓冲区
        Text_RECV.Text = "" '清空接收缓冲区
        Text_SEND.SetFocus
        Exit Sub                '事件处理
    Case comEventTxFull  '发送缓冲区已满
        Text_SEND.Text = "" '清空发送缓冲区
        Text_RECV.Text = "" '清空接收缓冲区
        Text_SEND.SetFocus
        Exit Sub                '事件处理
    Case comEvReceive  '接收缓冲区有数据
        Dim str As String
        str = MSComm.Input  '从接收队列中读入字符串
        Text_RECV.Text = Text_RECV.Text + str '读出字符串送显
        End Select
End Sub