How to correct the writing of data into the serial port

Dear Experts!

Here is my problem in Ms Access VBA Code , the code which is supposed to write to the serial port is not fed with data as a result it cannot write anything to the port, below is the actual peice of code that require fixing:

VBA CODE 1

' Write data to serial port.

   

 strData = JsonConverter.ConvertToJson(transaction, Whitespace:=3) & Chr$(13)
    lngStatus = CommWrite(intPortID, strData)
    lngSize = Len(strData)
    If lngStatus <> lngSize Then
    Beep
    MsgBox "No data found"
    ' Handle error.
    End If

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Audit proof

If I send the same data to a text file , I'm able to see the actual Json data in text form by using the CODE below:


VBA CODE 2

Dim json As String
Dim theFileName  As Variant
json = JsonConverter.ConvertToJson(transaction, Whitespace:=3) & Chr$(13)
theFileName = "C:\Users\admini\Desktop\Leaders\VBA Json.txt"
Dim handle As Integer
handle = FreeFile
Open theFileName For Output As #handle
Print #handle, json 'jsonSerialization
Close #handle

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See also screen shoot which confirms that there is no data at all written the port: