Qlink-3000 Multiplexing modem
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Copyright © 2003 -2005 Cronyx Engineering
21
3.2. Emergency alarms
The Qlink-3000 multiplexing modem is equipped with an emergency alarm interface.
The emergency alarm interface is used for turning on an external executive unit (ringer,
buzzer, console indicator, etc.) during emergency situation, for example, loss of carrier,
loss of synchronization, power failure. It is switched on by “dry” (i.e. not connected to
any multiplexer electrical circuits) relay contacts.
Additionally, the interface has a pair of input contacts, the state of which (closed/open)
is transmitted to the remote device and leads to relay activation at the remote. If the
multiplexer is installed in an unserviced room, then the input contacts may be used, for
example, for remote climate sensors, door opening signals, etc.
!
The input contacts must be closed by a switch, which is isolated from electrical
circuits! Non-compliance with this requirement may lead to device
malfunction.
Contact 9 closes to contact 4 during normal operating mode. During the “alarm” state
contact 9 disconnects from contact 4 and connects to contact 5.
The external sensor has two operating modes: closing-sensitive and opening-sensitive.
The mode is set to closing-sensitive by default. When contact 3 connects to contact 7,
the remote device switches to alarm state.
The console may be used to set the mode to opening-sensitive, in this case the sensor
must be normally closed, and alarm is raised on the remote device, when the sensor
opens.
The relay switches to the “alarm” state (contact 9 disconnected from contact 4 and
connected to contact 5) under the following conditions:
• power failure;
• contact 3 is connected to contact 7 at the remote device (or it is disconnected, if the
opening-sensitive mode is selected);
• connection over the physical pair is not activated;
• loss of signal (LOS) or loss of cycle structure at one of the (used) E1 ports.
