The Master Expander is a combination of the Master and the Expander. It contains all the modules of the Master as well as the features of the Expander. Only a single site may be defined when a Master Expander is used. The Master Expander cannot be connected to a Master.

The Master Expander can communicate with all devices connected to its DOWN LINK. Expanders or Scanners are directly connected to one of the DOWN LINK Ports located on the front EZ-Panel of the Master Expander.

The Scanners are connected to the DOWN LINK Ports of Expanders. Up to eight Scanners can be connected to each Expander. These Expanders are in turn connected to higher-level Expanders or directly to the Master Expander depending on the site configuration.