Error reading hex value from serial port

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VB

Dear Friends,
I'm writing you to try to solve a problem,I'm sending some hex value using a serial port to an external device.
It answer to my status request , but instead to show the value of 0x01 in the middle of the data packet it show 0x00.
I'm using a simple vb.net winform on VS2012.
Here the code i'm using:

Imports System
Imports System.IO
Imports System.IO.Ports
Imports System.Text
Imports System.Threading


Public Class Form1

    
    Dim value As Byte
    
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    SerialPort1.Encoding = System.Text.Encoding.GetEncoding(1252)
    SerialPort1.Open()

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        SerialPort1.Close()
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        Dim array(6) As Byte
        array(0) = &H3
        array(1) = &H1
        array(2) = &H1
        array(3) = &HA4
        array(4) = &HA5
        array(5) = &HB2
        SerialPort1.Write(array, 0, array.Length)
        Label1.Text = ""
      
        For i = 0 To 10
            value = SerialPort1.ReadByte()
            Label1.Text += value.ToString("x2") + " "
        Next
    End Sub

I'm receiving that :

03 01 01 A4 A5 B2 00 00 03 00 FC

But as from the device datasheets I must receive:

03 01 01 A4 A5 B2 01 00 03 00 FC

Using a port sniffer I see that the device answer correctly with the value of 0x01.
Somebodys has an idea why from my application I read the byte 6 as 0x00 and not 0x01?
The problem seems to be only with the value 0x00 and 0x01 ....others value are readed correctly(I suppose).

Thanks in advance

Maurizio

What I have tried:

Using a serial port com sniffer the bytes received are correctly.