Keri Systems SB-293 - Manual (Page 37)

Keri Systems, Inc. Technical Reference Manual – PXL-250 and SB-293
Revision 5.5 P/N: 01836-004 Page 37
8.2.4 General Purpose Output Relay
A general-purpose output relay receives a signal from the controller that energizes the
output relay, switching its state. This state change typically initiates or ends an action
outside of the controller.
8.2.4.1 Normally Closed Relay
A device may be attached to the relay's normally closed circuit so that it is always on
until a signal from the controller energizes the relay, opening the circuit and turning
the device off. The general-purpose output relay is configured through the Doors
program.
A normally closed general-purpose output relay may be used to disable a remote
sensor. The controller opens the normally closed relay circuit based on programmed
instructions within the controller or from a direct command by an operator. The
opened circuit cuts power to the remote sensor, temporarily disabling it. Refer to
Figure 10-9 on page 81 and Figure 10-15 on page 88 for possible general-purpose
normally closed output wiring diagrams.
8.2.4.2 Normally Open Relay
A device may be attached to the relay's normally open circuit so that it is always off
until a signal from the controller energizes the relay, closing the circuit and turning the
device on. The general-purpose output relay is configured through the Doors access
control software.
A normally open general-purpose output relay may be used to activate a video camera.
The controller closes the normally open relay circuit based on programmed
instructions within the controller or from a direct command by an operator. The closed
circuit provides power to the video camera, allowing an operator to remotely view the
area covered by the camera. Refer to Figure 10-8 on page 81 and Figure 10-14 on
page 88 for possible general-purpose normally open output wiring diagrams.