Premisys 840160, Справочное руководство

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1-16 Alarm Cards
Model No.
Running Head
Alarm Card Descriptions Alarm Cards
Switch S1 controls the sensors on the J3 (lower) connector, and switch S2 controls the sensors
on the J4 (upper) connector.
The factory default setting for the voltage control switches is SYS .
Alarm Sensor Jumpers
Each sensor is associated with a pair of jumpers that control whether the sensor is powered
from the card (active mode) or an external device (passive mode). The passive mode provides
2500V of isolation. Figure 1-4 shows these options.
Figure 1-4. Active and Passive Alarm Sensor Modes
The jumpers are separated into two groups of 14 jumper pairs. The upper group is associated
with the sensors on the upper amphenol connector (J4), and the lower group is associated with
the sensors on the lower amphenol connector (J3). The jumper pair sensor assignments are
silk-screened on the card. The jumpers for sensor 1 are indicated as SI1, and the jumpers for
sensor 28 are indicated as SI28. One of these sensor groups is detailed in Figure 1-5.
Active Mode
Passive Mode
Current
Source
External Device
External Device
Current Source
Alarm Card
Alarm Card