Dräger REGARD 3900 Series Instructions For Use Manual page 26

Installation & commissioning
5.8 Connecting other external sources
The cable cross-section for external units is limited to a maximum of 2.5 mm
0.5 mm
5.8.1 Remote acknowledgement
Remote acknowledgement is a switch that has the same functions as the button
Acknowledge/OK, but outside the control unit. If a remote acknowledgement is
required:
– In normal operation, connect an open switch to the terminals for remote
acknowledgement (RR) of an input module.
– If there are several input modules installed, it is sufficient to connect the remote
acknowledgement switch to only one input module.
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REGARD 3900