Service manual

5
Characteristics
DCB, DCFCB and DCFCTB Models
The antenna system is not included with the radio controller models. The appropriate
directional or omni-directional antenna system must be ordered separately.
Control Unit/Battery Box
The Control Unit/Battery Box consists of two cabinets, which are channel mounted
for ease of installation (refer to Figure 1 DCB, DCFCB, and DCFCTB Battery and
Control Cabinets.) The upper NEMA 4 cabinet houses the necessary electronics and
controls for producing the siren signals, and the charging system for the four 12 Volt
batteries.
The lower vented NEMA 4 style enclosure houses four (4) user provided,
maintenance free, lead-acid, deep-cycle, rechargeable batteries. The lower and upper
cabinets are interconnected via Liquid-Tight conduit, which is sealed to prevent
harmful vapors from entering the control area. The four batteries are connected in
series to provide 48 VDC operating power to the siren, while the chargers in the
upper cabinet operate on 120 VAC to keep the batteries charged. This arrangement
continues to provide power to the siren in the event of a power failure. The controller
works primarily off the AC input voltage. In the event of an AC power failure, the
controller automatically obtains power from a 48 V to 12 V DC-to-DC converter
powered by the four 12 V batteries.
DCFCTB Communications Controller
The DCFCTBs are two-way control and status monitoring siren controllers. The units
interface to an off-the-shelf two-way radio transceiver and communicate to a base
control unit via either DTMF or FSK signaling depending on the model purchased.
The controllers decode any combination of Single-Tone, Two-Tone Sequential,
DTMF, EAS, POCSAG or FSK formats for activation. This makes the two-way
controller compatible with virtually any existing siren control system.
The digital DCFCTBs provide the capability of digital encoding and decoding with
added Security. Throughout this manual, all references to digital encoding, digital
decoding, and FSK features and functions pertain only to the DCFCTBD series
models. You can upgrade the DTMF version of the DCFCTB to the digital version
DCFCTBD with a software update. All DCFCTB models come equipped with two
useable relay outputs, which can be programmed independently to activate with
various codes. Relay #3 is wired as a normally closed contact and is used to interrupt
the 2001AC transformer during a growl test (if applicable). Relay #4 is reserved for a
low voltage disconnect.
There are also four landline inputs and four local pushbuttons, which you can use to
activate and cancel the unit.
The decode codes, relay timing and optional warning sounds are programmed into the
unit through a standard RS232 serial port.