• Single voltage-free relay output • Output relay can be powered internally or externally (selectable at installation) • Single input for connection to dry contact inputs • Monitors and signals three distinct input states: Normal; Alarm; Open-circuit • Separate indicators for Quiescent, Alarm and Fault conditions • Polling indicator shows quiescent operation • DIP switch address setting • 125 usable detector address settings per loop
621 analogue addressable single input/output modules provide the interface to connect an electrically isolated dry-contact switched input to Numens addressable fire detection control and indicating equipment.
A parallel resistive input filter allows multiple states to
be monitored at the input. The states are converted to
the loop communications protocol by the module, to
enable them to be displayed on the control and