Abus Terxon MX Instructions D'installation page 113

The diagram below shows the correct usage of soldered
distributors when connecting more than one detector to an
alarm zone:
NC alarm contact
(e.g. contact switch
NC-Alarmkontakt
(z.B. Öffnungsmelder)
Connection cable to alarm centre
Anschlusskabel zur Zentrale
As mentioned above, the alarm centre evaluates the
alarm zones via the existing current flow. Most alarm
detectors are normally closed, which means that the
detectors interrupt the alarm zone in the event of an
alarm. The detectors are called NC (normally closed)
detectors and are connected as follows (the CCT jumper
must be removed):
NC alarm contact
Sometimes it is necessary to combine several alarm
contacts in a zone. Connect the contacts serially.
NO (normally open) contacts (e.g., for panic buttons)
cannot be connected to this alarm centre.
Verteiler
9
NC alarm contact
UK