Re: Reading from a Serial Port Part II
- From: "AlexS" <salexru2000NO@xxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 17 Jul 2007 17:52:01 -0400
You can use this sample. No other routine is required.
For example, with
string s = "AA";
if (Int32.TryParse(s, NumberStyles.HexNumber, CultureInfo.InvariantCulture,
out result)) {
....
}
"John Wright" <riley_wrightx@xxxxxxxxxxx> wrote in message
news:eTpgHnLyHHA.140@xxxxxxxxxxxxxxxxxxxxxxx
Okay I am one step closer to this. I can now read the HEX format of this
string. I get the following:
53 00 7E AA 80 80 80 80 80 80 80 00 80 80 80 80 00 80 80 80 80 82 80 00 80
80 80 80 00 80 80 80 82 80 88 A0 00 80 80 BE 80 00 80 90 80 82 80 80 84 00
80 80 80 45 0D 0A 00
I can split this data on a space, now I want to convert each value to its
binary equivalent. Ignoring 53, 00, 7E which are the opening sequence,
and ignoring oD, 0A and 00 as the ending sequence, I would like to convert
as follows (I did these calculations in my calc) and ignoring the first
two bits:
BE = 10111110 Which would indicate fields 1-5 are selected
AA= 10101010 Which would indicate fields 1,3,5 are selected
etc.
Anyone have a routine that would convert from HEX to Binary so I can get
the string value of the binary?
Thanks.
John
"John Wright" <riley_wrightx@xxxxxxxxxxx> wrote in message
news:OnixC$KyHHA.5484@xxxxxxxxxxxxxxxxxxxxxxx
I am trying to read the data from a device on a serial port. I connect
just fine and can receive data fine in text mode but not in binary mode.
In text mode the data from the device comes in like this:
S~5BBBBBBBBBBBBBBB5BBBBBBBB5B31BB4BB2B5BB4BBBE
S is the start of the line, ~ indicates a good read, B is a blank
reading, and the numbers 1-6 correspond to a location on the device for a
line. So there are six positions on the line and only 1 of 6 can be
selected.
However, you can switch it to binary mode to read lines of data in so
that each line can have more that one position read. bit 7 is always 1
and bit 6 is always 0. Bits 5 to 0 are 1 or 0 depending on if they are
selected. So if I select three positions (position A,B and E) then the
reading for that line should be (translated to binary) 10110010 or hex
0xB2.
When I process this through my VB.net program I get the following line
(in text)
S~???????????????????????????????????????????E
So I switch to hyper terminal and get the following line:
S~,???????????????,????????,?^ ??"????,??"???E
My code to read from this device is very simple:
Dim WithEvents serialPort As New IO.Ports.SerialPort
Public Delegate Sub myDelegate()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
For i As Integer = 0 To My.Computer.Ports.SerialPortNames.Count - 1
ComboBox1.Items.Add(My.Computer.Ports.SerialPortNames(i))
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
If serialPort.IsOpen Then
serialPort.Close()
End If
Try
With serialPort
.PortName = ComboBox1.Text
.BaudRate = 19200
.Parity = IO.Ports.Parity.None
.DataBits = 8
.StopBits = IO.Ports.StopBits.One
End With
serialPort.Open()
Catch ex As Exception
End Try
End Sub
Private Sub serialPort_DataReceived(ByVal sender As Object, ByVal e As
System.IO.Ports.SerialDataReceivedEventArgs) Handles
serialPort.DataReceived
TextBox1.Invoke(New myDelegate(AddressOf UPdateTextBox), New Object()
{})
End Sub
Public Sub UPdateTextBox()
With TextBox1
.AppendText(serialPort.ReadExisting)---> Reads fine for text mode, but
does not work for binary mode
End With
End Sub
I can detect if the device is in binary mode or text mode. What I want
to do is switch from text mode to binary mode so I can read the binary
fields and translate them. In the first line above:
S~5BBBBBBBBBBBBBBB5BBBBBBBB5B31BB4BB2B5BB4BBBE
Every field between the ~ and the E are for one row of data. So instead
of getting a 5 from the first position (this indicates that position 5
was selected) I want to get 10000010, B = 10000000.
Any help would be appreciated.
John
.
- Follow-Ups:
- Re: Reading from a Serial Port Part II
- From: John Wright
- Re: Reading from a Serial Port Part II
- References:
- Reading from a Serial Port Part II
- From: John Wright
- Re: Reading from a Serial Port Part II
- From: John Wright
- Reading from a Serial Port Part II
- Prev by Date: Re: Reading from a Serial Port Part II
- Next by Date: How to display a DIB or draw it into a Bitmap
- Previous by thread: Re: Reading from a Serial Port Part II
- Next by thread: Re: Reading from a Serial Port Part II
- Index(es):
Relevant Pages
|
