erasable program read only memory. Operating data base shall be contained
in random access memory backed up with a minimum of 48 hours of
rechargeable batteries. Charge shall be maintained by the controller. The
operating software shall be developed for each controller on an individual
basis.
2.6.5
Processor
Controller processor shall communicate to and from the I/O interface boards
via a multipair, bidirectional communication bus incorporating digital
multiplexing techniques. Communications facilities shall allow the
processor to communicate with remotely located I/O interface boards at a
distance of up to 305 meters 1000 feet. Where operational features require
two or more controllers to interact, the interaction shall be hard wired,
point for point. Optionally, data communication may be provided for
controller to controller interaction provided operational considerations
remain unchanged.
2.6.6
Interface
The I/O interface boards shall be standard printed circuit boards
containing the necessary coding/decoding solid state circuits for
communicating with the processor, method of setting board address as
required in this section, LED indicators which display the status of each
point and plug-in input/output modules.
2.6.7
Voltage
Controller shall operate on 105 to 130 V ac, 60 Hz and contain an integral
circuit breaker for overload protection. Controller shall operate properly
in environmental conditions of zero to 60 degrees C in up to 95 percent
humidity (noncondensing). Controller shall conform to electrical noise
standards of IEEE C37.90.1 and NEMA ICS 1.
2.6.8
Speed
The speed of the controller shall be such that no delay is noticed between
the initiation of a control function such as operating a switch or opening
a monitored door, and the resulting control action.
2.7
CONTROL POWER TRANSFORMER
Provide control power transformers to supply low voltage, 24 V ac power for
locking control or signaling devices. Transformer shall be provided with
secondary, 24 V ac output with circuit breaker type overload interruption.
Transformer shall be rated for not less than 20 percent of load imposed on
transformer of most severe loading condition. Power source for control
power transformer shall be from building emergency power system.
2.8
DC POWER SUPPLY
2.8.1
Low Voltage Power Supply Units
Provide low voltage dc power supply units to provide 24-volt regulated,
filtered dc power for locking controls, dc locks and signal devices. Output
power shall be 24 V dc with ampere rating not less than 150 percent of load
imposed on power supply under most severe conditions of load. The dc
output shall be fused. Output voltage shall be regulated within plus or
minus 5 percent from no load to full load. Power supply unit shall be U.L.
SECTION 08745
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