frmmainshow.frm

GE plc 串口通讯

VERSION 5.00
Object = "{648A5603-2C6E-101B-82B6-000000000014}#1.1#0"; "MSCOMM32.OCX"
Begin VB.Form frmMainShow 
   Caption         =   "Form1"
   ClientHeight    =   6450
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   8145
   LinkTopic       =   "Form1"
   ScaleHeight     =   6450
   ScaleWidth      =   8145
   StartUpPosition =   3  '窗口缺省
   Begin VB.Timer Timer1 
      Enabled         =   0   'False
      Interval        =   100
      Left            =   480
      Top             =   4080
   End
   Begin VB.CommandButton Command3 
      Caption         =   "STOP"
      Height          =   375
      Left            =   3840
      TabIndex        =   3
      Top             =   5760
      Width           =   1335
   End
   Begin VB.CommandButton Command2 
      Caption         =   "END"
      Height          =   375
      Left            =   6240
      TabIndex        =   2
      Top             =   5760
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "START"
      Height          =   375
      Left            =   1800
      TabIndex        =   1
      Top             =   5760
      Width           =   1455
   End
   Begin VB.TextBox Text1 
      Height          =   975
      Left            =   480
      MultiLine       =   -1  'True
      TabIndex        =   0
      Text            =   "frmMainShow.frx":0000
      Top             =   1680
      Width           =   6975
   End
   Begin VB.Timer Timer4 
      Left            =   480
      Top             =   3120
   End
   Begin MSCommLib.MSComm MSComm1 
      Left            =   3720
      Top             =   4320
      _ExtentX        =   1005
      _ExtentY        =   1005
      _Version        =   393216
      DTREnable       =   -1  'True
      InputMode       =   1
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "采用SNPX协议实现GE90-30PLC与上位机通信：19200,O,8,1；SNPID:ABCDEF"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   15.75
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00C00000&
      Height          =   735
      Left            =   600
      TabIndex        =   4
      Top             =   480
      Width           =   6855
   End
End
Attribute VB_Name = "frmMainShow"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim TimeOut4Flag As Boolean
Dim FirstTime As Integer
Dim ReadNumber As Integer
Dim RealStrings(30) As String
Dim CurCount As Integer
Dim Outflag As Boolean

Private Sub Command1_Click()
Timer1.Enabled = True
End Sub

Private Sub Command2_Click()
End
End Sub

Private Sub Command3_Click()
Timer1.Enabled = False
End Sub

Private Sub Form_Load()
ReadNumber = 30
Call InitComPort
End Sub
Public Sub InitComPort()
    frmMainShow.MSComm1.CommPort = 1
    frmMainShow.MSComm1.Settings = "19200,O,8,1"
    frmMainShow.MSComm1.RThreshold = 23
    frmMainShow.MSComm1.InputLen = 0
    frmMainShow.MSComm1.InBufferCount = 0
    frmMainShow.MSComm1.OutBufferCount = 0
    frmMainShow.MSComm1.InputMode = comInputModeBinary
    frmMainShow.MSComm1.PortOpen = True
End Sub

Private Sub MSComm1_OnComm()
    Dim aa() As Byte
    Dim bb() As Byte
    Dim j As Integer
    Dim GetString As String
    Select Case MSComm1.CommEvent
        Case comEvReceive
        aa = MSComm1.Input
        Call Byte2Str(aa, GetString)
        Text1.Text = GetString

    End Select
End Sub


Public Sub ReadInputStatus()
    Dim OutString As String
    Dim SendDataByte() As Byte
    'OutString = "1B58" & "4142434445460000" & "0000000000000000" & "1700000000B2" 'attach 必需先发一次，建立连接后在发以下命令
    OutString = "1B58" & "4142434445460000" & "0108000004000000" & "17000000001A"
    Call Str2Byte(OutString, SendDataByte)
    frmMainShow.MSComm1.Output = SendDataByte
End Sub

Private Sub Timer1_Timer()
 Call ReadInputStatus
End Sub

Private Sub Timer4_Timer()
TimeOut4Flag = True
End Sub

Public Sub Str2Byte(ByVal strData As String, ByRef ByteData() As Byte)
Dim i, j, k As Byte
Dim tempstr As String
Dim Length As Long

Length = Len(strData)
ReDim ByteData(1 To Length / 2)

i = 2
j = 1
While strData <> ""
    tempstr = Left(strData, 2)  '默认为高4位在前，例如："7E"=7*16+E=126
    k = AscB(Left(tempstr, 1))
    If k >= 48 And k <= 57 Then
        k = k - 48
    ElseIf k >= 65 And k <= 70 Then
        k = k - 65 + 10
    End If
    ByteData(j) = k * 16

    tempstr = Right(tempstr, 1)
    k = AscB(Left(tempstr, 1))
    If k >= 48 And k <= 57 Then
        k = k - 48
    ElseIf k >= 65 And k <= 70 Then
        k = k - 65 + 10
    End If
    ByteData(j) = ByteData(j) + k

    strData = Right(strData, Length - i)
    i = i + 2
    j = j + 1
Wend
End Sub
Public Sub Byte2Str(ByRef ByteData() As Byte, ByRef strData As String)
Dim i As Long
Dim hex_in

strData = ""
For i = LBound(ByteData) To UBound(ByteData)
         hex_in = Hex(ByteData(i))  '例如：126=7E->"7E"
         If ByteData(i) < 16 Then
             strData = strData & "0"    '0--F 的值转化为字符时在前头补'0'
         End If
         strData = strData & CStr(hex_in)
Next i

End Sub