如何用VB通过串口和51单片机通讯使得单片机能够在IO口产生脉冲，脉冲的数量和频率由VB设定？
如何利用VB实现计算机与单片机的串口通信
用热探头，接ADC采样，用51区数据，从串口传入PC。PC做个数据曲线就可了
VB利用串口与单片机通信
Option Explicit
Dim strData As String
Dim sjSEnd() As Byte
'输入处理为16进制字符串
Public Sub InputManage(bytInput() As Byte, intInputLenth As Integer)
Dim n As Integer
ReDim bytReceiveByte(intInputLenth)
For n = 0 To intInputLenth - 1 Step 1
strData = strData & Hex(bytInput(n))
Next n
Text2 = strData
End Sub
Private Sub Command1_Click()
Timer1.Enabled = True
End Sub
Private Sub Form_Load()
MSComm1.Settings = "19200,N,8,1"
MSComm1.RThreshold = 1
MSComm1.PortOpen = True
Text1 = "" '在Text1中写16进制指令
Timer1.Interval = 200
Timer1.Enabled = False
End Sub
Private Sub MSComm1_OnComm()
Dim bytInput() As Byte
Dim intInputLen As Integer
If (MSComm1.CommEvent = comEvReceive) Then
MSComm1.InputMode = comInputModeBinary
intInputLen = MSComm1.InBufferCount
If intInputLen > 0 Then
Timer1.Enabled = False
End If
ReDim bytInput(intInputLen)
bytInput = MSComm1.Input
Call InputManage(bytInput, intInputLen)
'数据处理
'Dim l As Integer
'Dim ml As Byte
'l = Val("&H" & Mid(strData, 1, 2))
'ml = Val("&H" & Mid(strData, 3, 2))
'If Len(strData) = 2 * l + 2 Then
' strReceive(ml) = Mid(strData, 5, 2 * (l - 2))
'随后进行你想的数据处理
' strData = "" '清除接收数据
'End If
End If
End Sub
Private Sub Timer1_Timer()
Dim l As Integer
Dim i As Integer
l = Len(Text1) '可用于多字节指令
ReDim sjSEnd(l / 2 + 1)
sjSEnd(0) = &HBB
sjSEnd(l / 2 + 1) = &HEE
For i = 1 To Len(Text1) Step 2
sjSEnd((i + 1) / 2) = Val("&H" & Mid(Text1, i, 2))
Next
MSComm1.Output = sjSEnd
End Sub
利用VB实现串口接收单片机数据
InputModeBinary = 1 '通过 Input 属性以二进制方式检取回数据
写法有错，正确写法：
MSComm1.InputMode = comInputModeBinary '以二进制方式接收
或：
MSComm1.InputMode = 1 '以二进制方式接收
51单片机和VB做串口通讯的问题
不要连接,发送两个字节就行了,接收也两个字节
比如传感器要的数据是&hfff,就发送&hf和&hff
用二进制模式
redim sj(1) as byte
sj(0)=?
sj(1)=?
MSComm1.OutBufferCount = 0
MSComm1.Output =sj