How to connect to RFID dnr s918m with tcp/ip connection?

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C#

VB

hi all
I have an rfid device summit dnr-s918m and try to connect with tcp/ip using its provided API and connect it network card.

my code:

Dim Reader As New DataNetRFID.SR918X
------------
Dim Stat = Reader.TcpConnectReader("192.168.1.200", 100)
If Stat = DataNetRFID.ReturnValue.SUCCESS_RETURN Then
    Dim V1 As Integer, V2 As Integer, SN As String = ""
    Stat = Reader.GetFirmwareVersion(255, V1, V2)
    StStat.Text = "Reader Connect Successfully"
    StVersion.Text = String.Format("Firmware Version : {0}.{1}", V1, V2)
    Stat = Reader.GetSerialNo(255, SN)
    StSN.Text = String.Format("Reader Serial NO : {0}", SN)
    SetEnable(True)
    GroupBox1.Enabled = False
    GetANt()
    GetTCP()

Else
    StStat.Text = "Reader Connection Failed!"
End If

default device IP :192.168.1.200 and port 100

but stat variable assign value to ERR_PORT_OPEN_FAIL{2018}