FMUX/S-4E1-E2 Multiplexer
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Copyright © 2007 Cronyx
17
3.2. Emergency alarms
The multiplexer is equipped with an emergency alarm interface.
The emergency alarm interface is designed for switching on an external executive device
(bell, buzzer, or console indicator) during an abnormal situation. It is switched on by 'dry'
(that is, not connected to any multiplexer electrical circuits) relay contacts.
Contact 9 is closed to contact 4 during normal operating mode. In the 'alarm' state contact
9 disconnects from contact 4, and closes with contact 5 (see the 'Emergency alarm con-
nector' connection diagram in the 'Cable connections' section).
The relay switches to the 'alarm' state in the following situations:
• power failure;
• no signal or loss of frame synchronisation on the link;
• for links in the 'In use' state: no signal in one of the E1 ports;
• a signal from en external input sensor on the remote device is received – contact 3 on
the emergency alarm connector of the remote device is closed to contact 7 (or open,
of the on open mode is set in the configuration menu – 'Sensor input: Alarm on open').
If the multiplexer is installed in an unserviced room, then the external input sensor
contacts may be used, for example, for transmitting climate sensor signal, door open-
ing signals, etc.
!
The external input sensor contacts must be closed by an actuator, which is
isolated from electrical circuits! Non compliance with this requirement may
lead to multiplexer malfunction.
The external sensor has two operating modes: closing-sensitive and opening-sensitive.
By default the
on close
mode is set – when contact 3 closes to 7, the remote device
switches to the alarm state.
It is possible to set the on open mode from the console (see the description of the 'Sensor
input' command in the “'Configure' menu” section), in this case the sensor must be nor-
mally closed, and when it opens, the 'alarm' state is set on the remote device.
