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Section One:ADT-UZC-256 Universal Zone Coder

General

The ADT-UZC-256 Universal Zone Coder provides separate codes for up to 256 initiating
zones. Each code requires a different initiating circuit. Only one Notification Appliance
Circuit is required, but coded output from the ADT-UZC-256 can be fed to many output
circuits.

Coded Outputs

The ADT-UZC-256 contains three outputs, each rated for three amps at 30 VDC. These
outputs allow the ADT-UZC-256 to supply different coded information to certain output
circuits, depending on the alarm initiation condition. This can be useful when employing
coded outputs in floor-above, floor-below applications, or to provide various numbers of
rounds for bell circuits and strobe or lamp circuits.
These relays are controlled by a predefined program, and can be set to respond to general
alarm conditions with the fire alarm system. The ADT-UZC-256 also provides a second zone-
in-alarm override of the general alarm delay.

EIA-485 Communication

The ADT-UZC-256 and the CPU use the EIA-485 circuit for communication. When installed,
the zone coder automatically assumes the lowest available address on the EIA-485 interface.
Assignment of points to zone codes within the ADT-UZC-256 is automatic in the Unimode
II and Unimode 4-16. It is programmable in the Unimode 2020/1010. Addresses occupied
by the ADT-UZC-256 are unavailable to other devices on the EIA-485 circuit (AMG,
annunciators, etc.).

Zone Code Protocol

The ADT-UZC-256 allows the specification of several parameters:
• Up to four code digits.
• Number of rounds
• Pulse-ON, Pulse-OFF time
• Time between digits
• Time between rounds
Note: Due to the nature of coded outputs, the ADT-UZC-256 is not compatible with
notification appliances which do not produce a steady sound. Periodic appliances that
produce their own code (such as some codes available with electronic sounders) will
not be compatible with the ADT-UZC-256; some appliances may have a response
time which is too slow to operate with the programmed code.
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