Serialport readbyte not reading the correct data

Hello everybody
I'm writing a software in VB.net to communicate with an external device with modbus I have a problem while reading data received from the device , to put it in example , using
sp1.ReadByte() the data sent from the device is this :
05-03-04-00-00-01-9F-FE-0B
but I receive this
05-03-04-01-9F-FE-0B
I use this to read Data
Dim reponse As Byte() = New Byte(5 + (2 * nombre_registrre - 1)) {}
For i As Integer = 0 To response.Length - 1
response(i) = CByte(sp1.ReadByte())
Next
It seems like 0x00 are ignored , I tried to send stream of hex manually and Ive got the same problem , always readbyte ignore 0x00 bytes
Why is that ?
thank you so much for your help
Hey :)

you are expecting 9 bytes ..
is (5 + (2 * nombre_registre - 1)) = 9 ... No that is impossible the answer of this equation will always be even
therefore
for i as integer = 0 to responce.length-1
dont read 9 bytes ... it will read an even number of bytes.
Something is wrong in your code
I don't think it's has someting to do with my buffer length , If so why do I receive the other bytes (Not 0x00 bytes)
as I said before , the only bytes I can not receive are 0x00 , I think its something with readbyte() function
Hey :)

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