Public Safety Radio Enhancement System
Monitoring Unit and Annunicator Panel
DASalert Models 1221-A & 1221-B
Meets NFPA-72 (2010, 2013 & 2016) and current NFPA-1221 codes for a
Dedicated Annunciator and Monitoring Panel
Displays Status of:
Donor Antenna
AC Power
Battery Capacity
Battery Charger
System Status
Includes Form-C relay contacts to interface with
any fire alarm system
Monitors communications link for integrity
Includes independent circuitry to check antenna,
AC power, battery capacity, charger and overall
system status
Mates with or augments monitoring of any BDA,
antenna, charger, battery or UPS
Low cost, easy to install and program
Small size NEMA-4: 10”H x 8”W x 4”D
Backed up by internal battery (included)
Easy installation to optional primary power sources:
48 VDC or 24 VDC, or 120 VAC
Model 1221-A Monitor and Annunciator Panel
Typical Application
Code Requirements
The current edition of the NFPA 1221 fire code (shown below) and NFPA-72 (2010, 2013 & 2016) describe
the requirements for monitoring the performance of Public Safety in-building two-way Radio Enhancement
Systems with a dedicated panel. This panel is required to be located in the fire command center but some
jurisdictions require that it be located in the same room as the Radio Enhancement System.
These panels are designed to meet all these requirements. In addition, Model 1221-A contains additional
circuitry to enhance and augment the alarm sensing capabilities of the BDA and the DAS backup emergency
power supply if they are not code compliant.
Fault Signaling Relays
Some DAS components are not configured with the appropriate Form-C alarm relays that can interface
properly with all Fire Alarm Systems. This unit provides these alarm relays. They can be programmed to mate
with any Fire Alarm System with their ‘normally OFF’ or ‘normally ON’ states for any ‘fail safe’ convention that
is required by the Fire Alarm System.
Enclosure & Power Requirements
The enclosure is NEMA-4 rated consistent with the other requirements of the code and a small backup
battery (included) inside the panel provides over 24 hours of service if this is needed to supplement loss of
primary power. Primary power is provided by an AC socket-mounted 15 VDC power supply (included).
Communication Integrity
Per code, fault detection cables between the Radio Enhancement System and the panel are monitored to
detect open circuits or short circuits to ground. If this condition is detected the panel will trigger a fault alarm
to the Fire Alarm System signaling the loss of communications integrity.
Antenna Monitoring (Model 1221-A)
If the bi-directional amplifier (BDA) in the Radio Enhancement System does not have the capability to
monitor donor antenna faults, the panel can provide this by adding external Bias-Ts in line with the antenna.
The panel will detect common faults such as open circuits, short circuits, disconnected or severed cables
leading to the antenna without impacting the RF performance of the system.
This panel provides an economical easy-to-install solution to meeting the code requirements and the
flexibility to interface with and augment, if required, the fault detection and alarm signaling capabilities of a
large variety of standard components used in these systems. The small size and light-weight enclosure can
be wall-mounted into any installation.
Model Comparison
Model 1221 A
Annunciator System with FORM-C relay
outputs to main fire alarm installation
Model 1221 B
Alternative Donor Antenna Failure
Sense Module (Bias-T fittings not included)
Alternative DAS Battery Capacity Sense Module
Alternative DAS Battery Charger Failure Sense Module
Annunciator System Backup Battery (9 Ahr)
Annunciator System Power Supply and Battery Charger
* Prices shown are for standard 120 VAC powered models. Add $90 for 48 VDC or 24 VDC powered models.
Models 1221A and 1221B Module Descriptions
Annunciator System with FORM-C relay outputs to main fire alarm system
(Models 1221A & Model 1221B)
This is the basic annunciator system that accepts ALARM signaling from external relays contained
in the DAS equipment. The system accepts relay signaling indicating the following alarms:
Loss of AC Power
Amplifier Problems
Antenna Problems
DAS Battery Capacity below 30%
DAS Battery Charger Fail
Communications Faults
Summary System Alarm
The annunciator system provides FORM-C dry relay contacts to provide alarm signaling with any
fire alarm installation. The system will operate with DAS installations that include multiple amplifiers,
antennas and power sources, and includes circuitry to detect communications faults (open or short
circuits) with the DAS equipment.
Annunciator System Backup Battery
Both models are shipped with an 9 Ahr rechargeable SLA battery that mounts inside the enclosure
to provide over 24 hours of backup power.
Annunciator System Power Supply and Charger
Both models are shipped with an external 15 VDC power supply and battery charger that can be
connected to any 120 VAC power outlet. The battery charger includes indicators that show the health
of the panel’s backup battery. The need to replace this battery can be signaled to the building’s main
fire alarm system.
Alternative Donor Antenna Failure Sense Module
(Model 1221-A only)
This module provides a means of detecting open circuit, short circuits, disconnected, severed or lose
connector problems in the antenna feed from the donor. This circuitry utilizes external bias-T fittings
(not included). Multiple antennas can be connected in parallel to the same monitoring port.
Model 1221A should be used if your amplifier or other components in your installation do not have the
means of detecting donor antenna problems.
Alternative DAS Battery Capacity Sense Module
(Model 1221-A only)
If your installation has a backup battery to provide emergency DAS power in the event of an AC power
failure it must be monitored to detect when it has less than 30 % capacity left to power the system
when primary power is lost.
Model 1221A should be used if your emergency power unit does not have this capability.
Alternative DAS Battery Charger Failure Sense Module
(Model 1221-A only)
If your installation has a backup battery to provide emergency DAS power in the event of an AC power
failure, the battery charger must be monitored to detect if it has failed or is degraded.
Model 1221A should be used if your charger unit does not have this capability.
Excerpted from NFPA 1221 (2016 Edition):
Similar requirements in NFPA-72 (2010, 2013, 2016)
Standard for Installation, Maintenance, and Use of Emergency Services Communications System Dedicated Panel.
(1) A dedicated monitoring panel shall be provided
within the fire command center to annunciate
the status of all RF emitting devices and system
component locations. The monitoring panel
shall provide visual and labeled indications of
the following for each system component and RF
emitting device:
(a) Normal ac power
(b) Loss of normal ac power
(c) Battery charger failure
(d) Low battery capacity (to 70 percent depletion)
(e) Donor antenna malfunction
(f) Active RF emitting device malfunction
(g) System component malfunction
(2) The communications link between the dedicated
monitoring panel and the two-way radio
communications enhancement system must be
monitored for integrity.
10” x 8” x 4”
11.7 lbs
AC Power
System (Summary Alarm)
Form C Dry Relay
Outputs to
Fire Alarm System
Amplifier (BDA)
Fault inputs
from Radio
Analog Inputs
Battery Charger
Battery Capacity
Communications Fault
Donor Antenna OK / Fail
Amplifier OK / Fail
Charger OK / Fail
Battery Capacity OK / Low
AC Power ON / OFF
Donor Antenna Sense
DAS Battery +/-
UL: E65324, ETL: 4002961
120 VAC, 24 VDC or 48 VDC (100 mA max) | 303-526-1965 |