data received event - no data returned

Serial port data received event is not being thrown.  I can send data out but not receiving.
I can send and receive through realterm.  Trying to interface with a commercial mettler toledo scale.
mikeplasticAsked:
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mastiSoftConnect With a Mentor Commented:
  If SendNow = True Then //send command to serial port
                    ' WRITE DATA TO DEVISES-
                    z = UBound(ByteArray)
                    SerialPort1.Write(ByteArray, 0, z)

                    ResivBytes = 0 'going to control amount of bytes we read from SP
                    System.Threading.Thread.Sleep(10)
                    SendNow = False
                End If

                bRead = 0

                If SerialPort1.IsOpen = True Then
                    'answer is here
                    'SerialPort1.BytesToRead 'Number of Bytes to read
                    bRead = SerialPort1.ReadByte()

                    If bRead > 0 Then 'there is some bytes in buffer
                        Dim cData(bRead) As Byte
                        Label4.Text = Val(Label4.Text) + bRead
                        nRead = SerialPort1.Read(cData, 0, bRead)  'Reading the Data
                        '  ..................................................................
                        If chAscii.Checked = True Then
                            ascStr = ""

                            returnStr = ""
                            For Each b As Byte In cData
                                returnStr = returnStr & Chr(b)
                            Next
                            'lstReceive.Items.Add(returnStr)
                        End If
                        ' ..................................................................
                        If chAscii.Checked = False Then
                            returnStr = ""
                            ' controll if we get data in buffer
                            For Each b As Byte In cData
                                returnStr += Hex(b).PadLeft(2, "0")
                            Next

                            'lstReceive.Items.Add(returnStr)

                        End If
                    End If
                End If

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In background one loop waiting for command and as soon as command was send SP start read the answer. Hope it helps.
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mikeplasticAuthor Commented:
Very helpful - this was a great answer.
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