How to write hex value to serial port?

How can I write individual bytes say (x7e) in hex  to a serial port ? I have about an array lsit of 82 value that i need to write to a com port
serialCOMDiscover.Write()

Open in new window

screen-shot.jpg
cmdolcetAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

CodeCruiserCommented:
Wow you have been given a variety of links already including those from Delphi, MFC, VB, and VB.NET. But also have a look at this tutorial

http://www.dreamincode.net/forums/showtopic37361.htm
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
cmdolcetAuthor Commented:
Ok when I look at this tutorial. I see they ahve a method of  Transmission in HEX when i look at the code and plug it into my code I get an error on the line

HextoByte(msg)  is not declared?

 Dim newMsg As Byte() = HexToByte(msg)

0
Introduction to Web Design

Develop a strong foundation and understanding of web design by learning HTML, CSS, and additional tools to help you develop your own website.

CodeCruiserCommented:
If you go a bit further down the article, you would find the definition of this method



#Region "HexToByte"
''' <summary>
''' method to convert hex string into a byte array
''' </summary>
''' <param name="msg">string to convert</param>
''' <returns>a byte array</returns>
Private Function HexToByte(ByVal msg As String) As Byte()
    'Here we added an extra check to ensure the data
    'was the proper length for converting to byte
    If msg.Length Mod 2 = 0 Then
        'remove any spaces from the string
        _msg = msg
        _msg = msg.Replace(" ", "")
        'create a byte array the length of the
        'divided by 2 (Hex is 2 characters in length)
        Dim comBuffer As Byte() = New Byte(_msg.Length / 2 - 1) {}
        For i As Integer = 0 To _msg.Length - 1 Step 2
            comBuffer(i / 2) = CByte(Convert.ToByte(_msg.Substring(i, 2), 16))
        Next
        write = True
        'loop through the length of the provided string
        'convert each set of 2 characters to a byte
        'and add to the array
        'return the array
        Return comBuffer
    Else
        'Message wasnt the proper length
        'So we set the display message
        _msg = "Invalid format"
        _type = MessageType.Error
        ' DisplayData(_Type, _msg)
        'Set our boolean value to false
        write = False
        Return Nothing
    End If
End Function
#End Region

Open in new window

0
cmdolcetAuthor Commented:
ok thanks for the post back so fast. I need to ask this one important question you see the screen shot of the arraylist that im putting all this stuff into . I have some being passed as string and some as bytes.....Whats the best way to do this?
0
CodeCruiserCommented:
I do not know the structure of your program but you need to make segments of the code in a way that you could use the functions in both situations. For example, you could have two functions

WriteBytes(bytestowrite)
and
WriteString(stringtowrite)

The WriteString function would convert the string to bytes and then call the WriteBytes function internally.
0
cmdolcetAuthor Commented:
ok but how could i write each char one by one to the com port

for intloop =0 to arraylist_szie-1
comport1.write(char(i))

end loop

How could i write something like that

0
CodeCruiserCommented:
You need to study that article in detail and based on that you could write characters one by one. Or modify the code in the Write method to write one char at a time instead of a string.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.