The NFXI-MM10 provides an interface with normally open contact devices. The supervised state: normal, open circuit fault or short circuit alarm is sent back to the control panel.

In Opal Digital Protocol only one address is used for the entire multimodule with sub-addresses completing the remaining addresses. For compatibility with existing installations using Notifier CLIP Protocol, the first address is set from 01 to 90; the other modules are automatically assigned the next nine addresses; up to six unused addresses can be disabled by dip switch.