求助VB实现串口通信 点击：2237 | 回复：11
发表于：2006-01-03 11:09:00
3楼
用转换模块将422转换成232后，用VB编程。你可以用控件MSCOMM进行编程。在你的FORM中加入MSCOMM后，在初始化中对MSCOMM进行初始化。完成后添件ONCOMM事件。
Private Sub MainMSComm_OnComm()
On Error Resume Next
If MainMSComm.PortOpen = False Then
AddInfo DebugInfo, "串口没有打开", RunInfoList
Exit Sub
End If
Select Case MainMSComm.CommEvent
' Handle each event or error by placing
' code below each case statement
' Errors
Case comEventBreak ' A Break was received.
Case comEventFrame ' Framing Error
Case comEventOverrun ' Data Lost.
Case comEventRxOver ' Receive buffer overflow.
Case comEventRxParity ' Parity Error.
Case comEventTxFull ' Transmit buffer full.
Case comEventDCB ' Unexpected error retrieving DCB]
' Events
Case comEvCD ' Change in the CD line.
Case comEvCTS ' Change in the CTS line.
Case comEvDSR ' Change in the DSR line.
Case comEvRing ' Change in the Ring Indicator.
Case comEvReceive ' Received RThreshold # of
' chars.
'接收到一个字符产生的消息,判断是否是数据的开始,如果是继续接收168个,如果不是直接退出等待下一个数据
Case comEvSend ' There are SThreshold number of
' characters in the transmit
' buffer.
Case comEvEOF ' An EOF charater was found in
' the input stream
End Select
End Sub
Private Sub MainMSComm_OnComm()
On Error Resume Next
If MainMSComm.PortOpen = False Then
AddInfo DebugInfo, "串口没有打开", RunInfoList
Exit Sub
End If
Select Case MainMSComm.CommEvent
' Handle each event or error by placing
' code below each case statement
' Errors
Case comEventBreak ' A Break was received.
Case comEventFrame ' Framing Error
Case comEventOverrun ' Data Lost.
Case comEventRxOver ' Receive buffer overflow.
Case comEventRxParity ' Parity Error.
Case comEventTxFull ' Transmit buffer full.
Case comEventDCB ' Unexpected error retrieving DCB]
' Events
Case comEvCD ' Change in the CD line.
Case comEvCTS ' Change in the CTS line.
Case comEvDSR ' Change in the DSR line.
Case comEvRing ' Change in the Ring Indicator.
Case comEvReceive ' Received RThreshold # of
' chars.
'接收到一个字符产生的消息,判断是否是数据的开始,如果是继续接收168个,如果不是直接退出等待下一个数据
Case comEvSend ' There are SThreshold number of
' characters in the transmit
' buffer.
Case comEvEOF ' An EOF charater was found in
' the input stream
End Select
End Sub
发表于：2006-04-22 20:23:00
6楼
用转换模块将422转换成232后，用VB编程。你可以用控件MSCOMM进行编程。在你的FORM中加入MSCOMM后，在初始化中对MSCOMM进行初始化。完成后添件ONCOMM事件。
Private Sub MainMSComm_OnComm()
On Error Resume Next
If MainMSComm.PortOpen = False Then
AddInfo DebugInfo, "串口没有打开", RunInfoList
Exit Sub
End If
Select Case MainMSComm.CommEvent
' Handle each event or error by placing
' code below each case statement
' Errors
Case comEventBreak ' A Break was received.
Case comEventFrame ' Framing Error
Case comEventOverrun ' Data Lost.
Case comEventRxOver ' Receive buffer overflow.
Case comEventRxParity ' Parity Error.
Case comEventTxFull ' Transmit buffer full.
Case comEventDCB ' Unexpected error retrieving DCB]
' Events
Case comEvCD ' Change in the CD line.
Case comEvCTS ' Change in the CTS line.
Case comEvDSR ' Change in the DSR line.
Case comEvRing ' Change in the Ring Indicator.
Case comEvReceive ' Received RThreshold # of
' chars.
'接收到一个字符产生的消息,判断是否是数据的开始,如果是继续接收168个,如果不是直接退出等待下一个数据
Case comEvSend ' There are SThreshold number of
' characters in the transmit
' buffer.
Case comEvEOF ' An EOF charater was found in
' the input stream
End Select
End Sub
Private Sub MainMSComm_OnComm()
On Error Resume Next
If MainMSComm.PortOpen = False Then
AddInfo DebugInfo, "串口没有打开", RunInfoList
Exit Sub
End If
Select Case MainMSComm.CommEvent
' Handle each event or error by placing
' code below each case statement
' Errors
Case comEventBreak ' A Break was received.
Case comEventFrame ' Framing Error
Case comEventOverrun ' Data Lost.
Case comEventRxOver ' Receive buffer overflow.
Case comEventRxParity ' Parity Error.
Case comEventTxFull ' Transmit buffer full.
Case comEventDCB ' Unexpected error retrieving DCB]
' Events
Case comEvCD ' Change in the CD line.
Case comEvCTS ' Change in the CTS line.
Case comEvDSR ' Change in the DSR line.
Case comEvRing ' Change in the Ring Indicator.
Case comEvReceive ' Received RThreshold # of
' chars.
'接收到一个字符产生的消息,判断是否是数据的开始,如果是继续接收168个,如果不是直接退出等待下一个数据
Case comEvSend ' There are SThreshold number of
' characters in the transmit
' buffer.
Case comEvEOF ' An EOF charater was found in
' the input stream
End Select
End Sub
发表于：2006-07-13 14:53:00
8楼
使用VB的MSComm控件来实现，具体实现过程如下：
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()
Dim x As String
If Text_SEND.Text = "" Then
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$(13)
For i = 1 To 20000000
Next
End Sub
Private Sub Form_Load()
MSComm.CommPort = 1
MSComm.Settings = "9600,n,8,1"
MSComm.InputLen = 0
MSComm.InBufferSize = 1024
MSComm.OutBufferSize = 512
MSComm.PortOpen = True
MSComm.SThreshold = 0
MSComm.RThreshold = 1
MSComm.InBufferCount = 0
MSComm.OutBufferCount = 0
Text_SEND.Text = ""
Text_RECV.Text = ""
End Sub
Private Sub MSComm_OnComm()
Select Case MSComm.CommEvent
Case comEventOverun
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEventRxOver
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEventTxFull
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEvReceive
Dim str As String
str = MSComm.Input
Text_RECV.Text = Text_RECV.Text + str
End Select
End Sub
Private Sub Button_RECV_C_Click()
Text_RECV.Text = ""
Text_SEND.SetFocus
End Sub
Private Sub Button_SEND_C_Click()
Text_SEND.Text = ""
Text_SEND.SetFocus
End Sub
Private Sub Button_SEND_Click()
Dim x As String
If Text_SEND.Text = "" Then
x = MsgBox("发送数据不能为空", 16)
Exit Sub
End If
If Not MSComm.PortOpen Then
MSComm.PortOpen = True
End If
MSComm.Output = Text_SEND.Text + Chr$(13)
For i = 1 To 20000000
Next
End Sub
Private Sub Form_Load()
MSComm.CommPort = 1
MSComm.Settings = "9600,n,8,1"
MSComm.InputLen = 0
MSComm.InBufferSize = 1024
MSComm.OutBufferSize = 512
MSComm.PortOpen = True
MSComm.SThreshold = 0
MSComm.RThreshold = 1
MSComm.InBufferCount = 0
MSComm.OutBufferCount = 0
Text_SEND.Text = ""
Text_RECV.Text = ""
End Sub
Private Sub MSComm_OnComm()
Select Case MSComm.CommEvent
Case comEventOverun
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEventRxOver
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEventTxFull
Text_SEND.Text = ""
Text_RECV.Text = ""
Text_SEND.SetFocus
Exit Sub
Case comEvReceive
Dim str As String
str = MSComm.Input
Text_RECV.Text = Text_RECV.Text + str
End Select
End Sub
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