Keri Systems SB-293 - Manual (Page 34)

Technical Reference Manual – PXL-250 and SB-293 Keri Systems, Inc.
Page 34 P/N: 01836-004 Revision 5.5
While there is no one there to activate a Global Unlock request, the input remains
open. When someone desires to globally unlock all doors, this person activates the
Global Unlock device (typically a normally open switch), closing the circuit and
generating a state change. The master controller then responds to this state change per
programmed instructions and generates an output unlocking all doors and allowing
exit. Refer to Figure 9-5 on page 45 for a possible Global Unlock wiring diagram.
NOTE: The Global Unlock input is not certified for use with fire systems. Please
check with local building codes regarding fire safety requirements.
8.1.5 General Purpose Input – SB-293
The general-purpose input accepts signals from either a normally closed or a normally
open input device that indicates when a change in state has occurred.
For a normally closed input device, while the input device is in its normal state the
general-purpose input circuit remains closed. When the input device is activated, the
general-purpose input circuit is opened generating a state change. The controller may
respond to this state change per programmed instructions. The general-purpose input
is configured through the Doors access control software.
A normally closed push-button may be used to provide a normally closed general-
purpose input. While the push-button is in its normal state, the normally closed circuit
is complete and no input signal is generated at the controller. When a user presses the
push button it opens the general-purpose input circuit and generates a state change.
The controller responds to this state change per programmed instructions and may
perform some action. Refer to Figure 10-9 on page 81 and Figure 10-15 on page 88 for
possible general-purpose, normally close Input wiring diagrams.
For a normally open input device, while the input device is in its normal state, the
general-purpose input circuit remains open. When the input device is activated, the
general-purpose input circuit is closed generating a state change. The controller may
respond to this state change per programmed instructions. The general-purpose input
is configured through the Doors access control software.
A normally open motion detector may be used to provide a normally open general-
purpose input. If the motion detector does not detect motion, its alarm circuit remains
open and no input signal is generated at the controller. When the motion detector does
detect someone entering its controlled area, its alarm circuit closes, completing the
general-purpose input circuit and generating a state change. The controller responds to
this state change per programmed instructions and may perform some action. Refer to
Figure 10-13 on page 86 and Figure 10-16 on page 90 for possible general-purpose,
normally open Input wiring diagrams.