NPORT5230编程要点：
服务器控制：
一、 初始化：Declare  Function nsio_init “IPSerial.dll” () as  long
          NSIO_OK(0): OK；
NSIO_SOCK_INIT_FAIL（-201）：    Socket initialize error.
          NSIO_THREAD_ERR（-3）：Create background thread fail.
二、 结束：Declare Function nsio_end "IPSerial.dll" () As Long
          NSIO_OK(0): OK；
          NSIO_SOCK_ERR（-202）：Communication with NPort error
三、 复位：Declare Function nsio_resetserver "IPSerial.dll" (ByVal server_ip As String, ByVal        password As String) As Long
          NSIO_OK(0): OK；
          NSIO_TIMEOUT（-203）：Communication with NPort timeout
          NSIO_NOT_ALIVE（-102）：NPort is not alive. Maybe the NPort is power down or network cable is disconnected 
          NSIO_SOCK_ERR（-202）：Communication with NPort error
四、 是否活动：Declare Function nsio_checkalive "IPSerial.dll" (ByVal server_ip As String, ByVal timeout As Long) As Long
          server_ip： NPort IP address, specified by null terminated string. Ex: "192.168.127.254".
timeout： The timeout value for connecting NPort in milliseconds. 
NSIO_OK(0): OK；
NSIO_SOCK_ERR（-202）：Communication with NPort error
NSIO_TIMEOUT（-203）：Communication with NPort timeout
NSIO_NOT_ALIVE（-102）：NPort is not alive. Maybe the NPort is power down or network cable is disconnected
端口控制：
server error啥意思一、 打开端口：Declare Function nsio_open "IPSerial.dll" (ByVal server_ip As String, ByVal port_index As Long, ByVal timeouts As Long) As Long
      server_ip： NPort IP address, specified by null terminated string. Ex: "192.168.127.254".
port_index： The serial port number of the NPort. 1 for 1st port, 2 for 2nd port, and so on. 
Timeouts： The timeout value for communicate with NPort in milliseconds. 
Succeed：Port id.
NSIO_BADPARM（-2）：Bad parameter
NSIO_MEMALLOCERR（-4）：memory allocate error
NSIO_SOCK_INIT_FAIL（-201）：    Socket initialize error.
NSIO_CONNECT_FAIL（-200）：Connect to NPort fail. Maybe the NPortis power down or network cable is disconnected.
NSIO_SOCK_ERR（-202）：Communication with NPort error
NSIO_TIMEOUT（-203）：Communication with NPort timeout

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