form1.frm

串口 设计全攻略 详细讲解了串口设计的策略

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Object = "{3B7C8863-D78F-101B-B9B5-04021C009402}#1.2#0"; "RICHTX32.OCX"
Begin VB.Form Form1 
   BorderStyle     =   1  'Fixed Single
   ClientHeight    =   7740
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   8205
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   7740
   ScaleWidth      =   8205
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command3 
      Caption         =   "发送"
      Height          =   375
      Left            =   6240
      TabIndex        =   9
      Top             =   360
      Width           =   855
   End
   Begin VB.TextBox Text5 
      Height          =   375
      Left            =   5160
      TabIndex        =   8
      Text            =   "="
      Top             =   360
      Width           =   855
   End
   Begin VB.TextBox Text4 
      Height          =   375
      Left            =   3360
      TabIndex        =   7
      Text            =   "0"
      Top             =   360
      Width           =   615
   End
   Begin VB.Frame Frame1 
      Caption         =   "参数设置"
      Height          =   1215
      Left            =   480
      TabIndex        =   2
      Top             =   120
      Width           =   2655
      Begin VB.TextBox Text3 
         Height          =   375
         Left            =   960
         TabIndex        =   6
         Text            =   "1"
         Top             =   720
         Width           =   615
      End
      Begin VB.CommandButton Command2 
         Caption         =   "重置"
         Height          =   375
         Left            =   1800
         TabIndex        =   4
         Top             =   480
         Width           =   735
      End
      Begin VB.TextBox Text2 
         Height          =   390
         Left            =   360
         TabIndex        =   3
         Text            =   "2400,e,8,1"
         Top             =   240
         Width           =   1215
      End
      Begin VB.Label Label1 
         Caption         =   "端口："
         Height          =   255
         Left            =   240
         TabIndex        =   5
         Top             =   840
         Width           =   615
      End
   End
   Begin VB.CommandButton Command1 
      Caption         =   "清空"
      Height          =   375
      Left            =   4080
      TabIndex        =   1
      Top             =   360
      Width           =   855
   End
   Begin RichTextLib.RichTextBox Text1 
      Height          =   6015
      Left            =   480
      TabIndex        =   0
      Top             =   1440
      Width           =   7335
      _ExtentX        =   12938
      _ExtentY        =   10610
      _Version        =   393217
      Enabled         =   -1  'True
      ScrollBars      =   2
      TextRTF         =   $"Form1.frx":0000
   End
   Begin MSCommLib.MSComm MSComm 
      Left            =   7560
      Top             =   600
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
      RThreshold      =   1
      BaudRate        =   2400
      ParitySetting   =   2
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim str As String
Private Sub Command1_Click()
Text1.Text = ""
Text4 = 0
End Sub

Private Sub Command2_Click()
 If MSComm.PortOpen = True Then
 MSComm.PortOpen = False
 End If
 MSComm.CommPort = Int(Text3.Text)
 MSComm.Settings = Text2.Text
 MSComm.InputLen = 0
 MSComm.PortOpen = True
End Sub

Private Sub Command3_Click()
MSComm.Output = Text5.Text
End Sub

Private Sub Form_Load()
   Dim Instring As String
   MSComm.CommPort = 1
   MSComm.Settings = "2400,e,8,1"
   MSComm.InputLen = 0
   MSComm.PortOpen = True
   Text2.Text = MSComm.Settings
End Sub

Private Sub Form_Unload(cancel As Integer)
 If MSComm.PortOpen = True Then
 MSComm.PortOpen = False
 End If
End Sub

Private Sub mscomm_oncomm()
 Dim s As String
 If readcom(s) Then
 End If
End Sub

 Function readcom(s As String) As Integer
 
 On Error Resume Next
 If MSComm.InBufferCount Then
 MSComm.InputLen = MSComm.InBufferCount
 s = MSComm.Input
 Text1.Text = Text1.Text + s
 End If
 Text4.Text = Len(Text1.Text)
End Function