How to write a script to send to windows serial ports

Written by jon guenther
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How to write a script to send to windows serial ports
A serial port card for a computer. (serial port image by jimcox40 from

You can easily communicate in two ways with serial ports in the Windows operating system: VBScript or C#.NET. The VBScript method is most easily implemented utilising a third-party tool, but you can write the script yourself depending on your communication goals. Using C# has the advantage of utilising classes built into the .NET Framework, making scripts you write more powerful and secure.

Skill level:

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Things you need

  • Microsoft Visual C# 2010 Express Edition

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  1. 1

    Click the "Start" menu and then navigate to "All Programs."

  2. 2

    Navigate to the "Accessories" menu and click the "Notepad" icon.

  3. 3

    Type the following code in the text editor:

    Dim comp Name


    comp Name = inputbox("Enter the computer name:", "Prompt")

    Loop until comp Name <> ""

    ListPorts (compName)

    ' Subroutine to display info

    Sub ListPorts( comp Name )

    Dim objWMIService

    Dim collection

    Set objWmiService = GetObject("winmgmts:\" & comp Name & "\root\cimv2")

    Set collection = objWMIService.ExecQuery("SELECT * FROM Win32_SerialPort",,48)

    For Each objItem in collection

    Wscript.Echo "DeviceID: " & objItem.Description

    Wscript.Echo "MaxBaudRate: " & objItem.MaxBaudRate

    Wscript.Echo "ProviderType: " & objItem.ProviderType


    End Sub

  4. 4

    Save the file with the name "GetPorts.vbs" on your computer hard drive.

  5. 5

    Double-click the file to display in a message box the device description, max baud rate and provider type for each serial port on your computer.

  1. 1

    Click the "Start" menu and navigate to "All Programs."

  2. 2

    Navigate to "Microsoft Visual Studio 2010 Express" and click "Microsoft Visual C# 2010 Express."

  3. 3

    Click the "New Project" link on the Start Page and then click to highlight "Console Application."

  4. 4

    Enter a name of your choice in the text box provided and click "OK."

  1. 1

    Type the following at the top of the "Program.cs" file:

    using System.IO.Ports;

  2. 2

    Type the following code between the "{" and "}" brackets of the Main method:

    using (SerialPort sp = new SerialPort("COM1"))



    Console.WriteLine("Baud rate: " + sp.BaudRate.ToString());

    Console.WriteLine("Parity: " + sp.Parity.ToString());

    Console.WriteLine("Port name: " + sp.PortName.ToString());

    Console.WriteLine("Stop bit: " + sp.StopBits.ToString());



  3. 3

    Click the "Save All" icon

  4. 4

    Click the green arrow button to run the program. The script should return a message similar to the following:

    Baud rate: 9600

    Parity: None

    Port name: COM1

    Stop bit: One

Tips and warnings

  • You can write Windows programs, as well, that use forms to manage serial ports, and send and receive messages from them.
  • For a third-party tool that can implement the VBScript method, see Resources.
  • Using VBScript to communicate with serial ports is much less secure than utilising managed code such as C# or C++.

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