Any combination of 2, RZ 100 Analog and Digital Expansion boards can be connected to the RZ 100's I/O expansion port. The unit can share information on a peer-to-peer basis with other controllers via the built-in RS-485 Local Area Network. It also has an auxiliary port which can be set up for RS-485 or RS-232 communication to peripheral devices such as modems and printers. Graphical Application Programming and User Interface are accomplished using perfectHOST software running under either Windows 95, 98, ME, 2000, NT or XP.