Videotec SM82A - Manual (Page 55)

Page 17 MNVCSM42A_0408
4.2.2 Alarm type
The alarm signal can be considered CONTINUOUS or IMPULSIVE.
The difference lies in how the matrix behaves when the alarm signal ceases:
• impulsive alarm: the matrix remains in alarm status, waiting for a reset (from the keyboard, external or timed)
• continuous alarm: the matrix resets automatically and returns to normal operation without waiting for a reset.
4.2.3 Alarm cond ition reset
The alarm can be reset in four ways:
• from the keyboard: the operator requests reset of the alarm condition, sometimes after inserting the reset
password (when required by the DCJ or DCK keyboard; the other keyboards accept the reset request
without requiring a password)
• externally: activated by a reset contact on the alarms connector
• timed: it is possible to select a time after which the alarm will reset automatically (this can be from 2 seconds
to 12 hours)
• automatically, if the alarm is defined CONTINUOUS and it stops
4.2.4 Alarm reco gnition enabling
Each output video can be enabled to recognise an alarm condition or not, depending on its actual operating
requirements.
The outputs not concerned with an alarm condition (each of the alarm contacts can be configured individually)
show no indication on the video, and only the keyboard will be able to notify an abnormal situation as it occurs.