The industrial-grade serial port server is a device that can access the Internet, one end of which is connected to the network through a network cable, and the other end is connected to the original multiple serial devices through multiple RS232 serial ports or RS485 serial ports. In this way, the middle through the serial port server, you can connect these devices to the computer through the network, because the computer is connected to the Internet, thus realizing the remote control of those devices with a computer.