What is the best way to access a serial port from VBA?

What is the best way to access a serial port from VBA?

I have a need for some of our sales reps to be able to send a simple string over the serial port from an action button in PowerPoint. I don't commonly use VBA, especially for anything like this. Normally I would turn it into an application of some sort, but I actually don't think the idea is that bad. It will be a handy tool for them to demo this device with while on a projector and talking to other sales guys and non technical people. Also, this sales guy will have no problem making small modifications to the VBA or PowerPoint presentation, but would not do as well with recompiling a .NET application.

I know we could do it through a batch file run from the presentation on the action, but that doesn't make me very happy. I figure we could probably access a COM object and run from there, but again I am not real up on the latest and greatest libraries to use in VBA, and it would also be nice to get a quick little primer in how to easily open, send and close the connection.

Since this will need to be run on multiple people's computers, it would be nice if it would be easily transportable to other machines. I should be able to say it has to run on Office 2007 and Windows XP. Compatibility with anything else would be a nice bonus though.

How should I go about handling this? Any good tips or tricks? Library recommendations?

Solution 1:

The Win32 API handles the serial port as a file. You can access the serial ports directly by calling these API functions from within VBA. I had to do this for an old .NET application but VBA is no different.

Rather than hash it out for you on this site, here's a reference I've hung onto over the years. How to perform serial port communications in VBA

Solution 2:

Sub Stinky()
Dim COM_Byte As Byte
Dim Received_Lines As Long
Dim Input_Buffer As String
Dim Output_Buffer As String
Dim Chars2Send As Long
Dim CharsRemaining As Long
Dim lfsr As Long
    Open "COM7:9600,N,8,1" For Random As #1 Len = 1
    Input_Buffer = ""
    CharsRemaining = 0
    Do
    Get #1, , COM_Byte
    If COM_Byte Then
        If COM_Byte = 13 Then           ' look for CR line termination
            Debug.Print Input_Buffer, Now   ' print it
            Input_Buffer = ""               ' and clear input buffer
        '   generate some output (9 characters)
            lfsr = &H3FFFFFFF - 2 ^ (Received_Lines And 15)
            Output_Buffer = "?@@@@@@@@"
            Chars2Send = 9
            CharsRemaining = 9
            For j = 0 To 2
                Mid(Output_Buffer, 2 + j, 1) = Chr(Asc(Mid(Output_Buffer, 2 + j, 1)) + (31 And Int(lfsr / 32 ^ (2 - j))))
            Next j
            Debug.Print Output_Buffer
        '   show what I generated
            Received_Lines = Received_Lines + 1 ' keep track of received line count
        Else
            Input_Buffer = Input_Buffer & Chr(COM_Byte) ' assemble output buffer
        '   process any characters to send
            If CharsRemaining Then
                CharsRemaining = CharsRemaining - 1
                COM_Byte = Asc(Mid(Output_Buffer, Chars2Send - CharsRemaining, 1))
                Put #1, , COM_Byte
            End If
        End If
    End If
    DoEvents
    Loop
    Close
End Sub

This works for me. I'm not sure if the OPEN actually sets up the Baud rate, as I first used TeraTerm. My COM port is a USB connection to a BASYS3 prototyping kit. It is spewing characters at 9600, records of 36 characters ending with CR. I can randomly send commands of 9 characters. In the above code, I generate these command strings every time I have received a new line. The way I chose which character to send is a little clunky: perhaps a better way is to have a character pointer and a number of characters, and when those go equal to set them both to zero.