No try catch error when using none existing UnitIdentifier

[KeepITSimpleSolutions]

I never get an exception when using an UnitIdentifier that does not exists...

In short.. IP = OK.... PORT = OK...

For x = 1 To CInt(Trim(args(3)))
Try
Dim modbusClient As New EasyModbus.ModbusClient(Trim(args(1)), Trim(args(2))) With {
.UnitIdentifier = CByte(x),
.ConnectionTimeout = 5000
}
modbusClient.Connect()
If modbusClient.Connected Then
...
End If
modbusClient.Disconnect()
Catch ex As Exception
Console.WriteLine("ERROR = " & ex.Message)
End Try
Next
System.Threading.Thread.Sleep(10000)