Instruction manual

9-3
Section 9-2 - Dual-Circuit System Mother Board (DCMB)
Wheelock, Inc. Part Number: 107372
The Dual-Circuit System Mother board (DCMB) provides all signal handling capabilities between
the DCDC and the amplifier modules, terminal blocks for output wiring, and connectors for
handling signals between the DCDC and the digital voice module.
The DCMB is illustrated in Figure 9-2 on Page 9-4
Up to two amplifier modules may be connected to the DCMB. The amplifier modules may be
installed in any order in slots 1 and 2. Installing an amplifier module in slot 1 and 2 will result in
the module’s output appearing in the correspondingly numbered terminal block (labeled “Zone 1”
and “Zone 2”). For example, when an amplifier module is installed in slot 1, the amplifier
module’s output appears at the terminal block labeled “Zone 1”.
Up to 2 channels from the Digital Voice Module (MDX-2) may be connected to the DCMB. The
digital voice module is inserted into J5. The digital voice module channel will play through Zone 1
and Zone 2 if amplifier modules are installed.
IN1 through IN8 are the dry contact inputs used to trigger the automatic alarm circuits. With the
MDX-2 Module installed, IN1 through IN8 provide access to as many as 8 programmed
messages on the MDX-2.
If the MDX-2 is not used and the Shunt PCB is used, IN1 initiates Zone 1 and IN2 initiates Zone
2. IN3 through IN8 are not used.
The microphone input is located in the lower right corner of the board and is used for live voice
announcements.
Form C contacts are available for remote monitoring of Alarm Status and Trouble Status. Also
remote trouble power is available at 24 VDC, 0.100 Amps that is non-supervised.