Simple Gateway - intranet server safely obtains external network data

        Many units in order to prevent hacker intrusion , An independent internal local area network has been established , And the internal network is physically isolated from the external network . But in practice , Many times, the intranet server needs to connect to the Internet regularly to obtain or synchronize data . If you do it every time U Disk copy or manual plugging network , Very time-consuming and laborious . The cost of buying the net gate is too high , And the configuration is very troublesome . Recently found a simple device , It's easy to solve this problem .
        Pictured , Use a belt directly SDK The network switcher of secondary development can .

       Switch the network switch USB mouth （ Power supply + control ） Connect to service USB mouth , Installation manufacturer CH340 The driver . Then connect the network port of the switch computer to the network card of the server 2, Server network card 1 Connect the intranet core switch . The network card of the server 2 Configure as Internet IP.
      Connect the external network port of the network switch to the external network router with a network cable .
      At this time, press the supporting remote control to realize the connection and disconnection between the server and the external network .
      Install the supporting software , Enter the software timing setting interface , Set up regular switching to the Internet , Then switch to the intranet regularly .

       The following is wireless remote control - Network switcher serial port development protocol , If there are special needs , If the data synchronization is completed, disconnect the external network immediately , You can use it yourself VB Or other languages to write a timing control software ：
   1、 Serial port baud rate ：115200, No verification ,8 Digit bit ,1 Bit stop bit .VB demonstration ：MSComm1.Settings = "115200,n,8,1";
   2、 Single character command set ：
      Send characters 1 , Device return ZT=1  , Give a cry , The device switches to the external network , Red light .
      Send characters 2, Device return ZT=2  , Call twice , Switch the device to the intranet , Bright blue light .
      Send characters 4, The equipment circulates between the internal and external networks .
      Send characters 5, Device return BP=0, The buzzer is off , No more beeping when switching .
      Send characters 6, Device return BP=1, Buzzer on , Beep when switching .
      Send characters 7, Device return CLOK , The device clears the bound remote control button , At this time, the remote control board will fail , You need to rebind to use .
  3、 Remote control code matching instruction ：
    Press the key on the remote control board A, Device return RV+ Key code , Such as RVDD0928, Send... At this time D1+ Key code , Such as D1DD0928, Then bind the key to the Internet .
    Press the key on the remote control board B, Device return RV+ Key code , Such as RVDD0924, Send... At this time D2+ Key code , Such as D1DD0924, Then bind the keys to the intranet .
    Be careful D1 and D2 The key code behind the command is insufficient 6 position , Add in front. 0 A filling .
  4、 There is no need to add end line feed and carriage return when sending instructions , Just send characters .
 
      We just need to use 2 A simple command 1 and 2 that will do , That is, it's time to turn on , Send a character to the switcher through the serial port 1, The switcher will connect to the external network of the server , Wait until the data synchronization is completed , Send another character 2, You can disconnect the external network .