The serial device server can connect serial device such as RS232/485/422 to network send the data collected by the device to network, set up the transparent transmission channel for serial port and network to realize the device connected to network. Users can use configuration software or your own writing network communication software to communicate with device. Meanwhile, Shanghai ZLAN serial device server can support virtual serial port protocol, so that can be without upgrading the original serial software. The ZLAN RS232/485/422 three-in-one port serial device server can be conveniently used for any interface. There have full-isolation type ZLAN 5143I, isolation type ZLAN5143B, ordinary ZLAN5103, typical ZLAN5102-3.