Sending data to device via MS Comm VB6 - vb6

Question

I need to send a file to some electronic device and execute it.
I couldn't find any information online regarding MS Comms and I didn't find Documentation on the Microsoft (https://msdn.microsoft.com/en-us/library/aa231237(v=vs.60).aspx) any useful :
' Send Byte array data
MSComm1.Output = Out
Would be great if you guys could give me some pointers and help me to solve my problem. The problem that I am experiencing is an infinite loop at Loop Until MSComm1.OutBufferCount = 0, when I return "MSComm1.OutBufferCount" between Do and Loop "MSComm1.OutBufferCount" is 0 and files dont seem to be sent over to the device.
Closest function I got to at the present moment is below:
Function SendFile(tmp$)
Dim temp$
Dim hsend, bsize, LF&
' Open file
Open tmp$ For Binary Access Read As #2
' Check size on Mscomm1 OutBuffer
bsize = MSComm1.OutBufferSize
' Check file length
LF& = LOF(2)
' This code makes tiny pieces of data (Buffer sized)
' And send's it
Do Until EOF(2)
If LF& - Loc(2) <= bsize Then
bsize = LF& - Loc(2) + 1
End If
' Make room for some data
temp$ = Space$(bsize)
' Put the data piece in the Temp$ string
Get #2, , temp$
MSComm1.Output = temp$
Do
' Wait until the buffer is empty
Loop Until MSComm1.OutBufferCount = 0
Loop
' close file
Close #2
End Function

Answer 1

Have a look at the RThreshold and SThreshold properties
Below is a simple example project :
'1 form with :
' 1 label control : name=Label1
' 1 textbox control : name=Text1
' 1 command button : name=Command1
Option Explicit
Private Sub Command1_Click()
'send command
MSComm1.Output = Text1.Text & vbCr
End Sub
Private Sub Form_Load()
'config mscomm control and open connection
With MSComm1
.Settings = "9600,N,8,1"
.RThreshold = 1
.SThreshold = 0
.CommPort = 1
.PortOpen = True
End With 'MSComm1
End Sub
Private Sub Form_Resize()
'position controls
Dim sngWidth As Single, sngHeight As Single
Dim sngCmdWidth As Single, sngCmdHeight As Single
Dim sngTxtWidth As Single
Dim sngLblHeight As Single
sngWidth = ScaleWidth
sngHeight = ScaleHeight
sngCmdWidth = 1215
sngCmdHeight = 495
sngLblHeight = sngHeight - sngCmdHeight
sngTxtWidth = sngWidth - sngCmdWidth
Label1.Move 0, 0, sngWidth, sngLblHeight
Text1.Move 0, sngLblHeight, sngTxtWidth, sngCmdHeight
Command1.Move sngTxtWidth, sngLblHeight, sngCmdWidth, sngCmdHeight
End Sub
Private Sub MSComm1_OnComm()
'process received data
Dim strInput As String
Select Case MSComm1.CommEvent
Case comEvReceive
strInput = MSComm1.Input
Label1.Caption = Label1.Caption & strInput
End Select
End Sub
In Command1_Click I add a carriage return to the command from Text1 as most devices require the command to be finished by that
In MSComm1_OnComm I just print the received data to the label, but you might want to add the received data to a global variable, and then process the contents of that variable, as all data might not be received at once