Net2 plus is a networked access control system. A networked system gives the advantages of central control, event reporting and flexible control over users" access. Each control unit is part of a network but can run independently making its own decisions and remembering events. One Net2 plus control unit can be the network interface to the LAN and also run a wired RS485 daisy chain of other Net2 plus or Net2 classic units, removing the need for an independent TCP/IP to RS485 converter. Net2 plus is also available with a Power over Ethernet (PoE) power supply. PoE is a technology that allows both power and data to be passed along Ethernet cabling. Net2 plus with PoE simply plugs straight into the existing LAN using a standard RJ45 plug (providing it is powered by either a PoE switch or a PoE injector). Control units are sold as a PCB board only or within a plastic housing. The Net2 plus unit now comes with PoE+ power supply in metal/plastic cabinet; no separate mains supply back-up required.