Bogen MULTICOM 2000, Installation Instructions Manual

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18
Station Wiring
Knockouts are provided to admit station wiring. Station wiring is described is detail in the Station Equipment
Installation section.
Other Back Plane Connections
Connectors are provided on the back plane to accommodate some of the options available to Multicom 2000 (Relay
driver circuits, external clock control, serial port, etc. Figure 16 shows the back plane of the card frame assembly
(typical of MCMF and MCRM). It illustrates the location and designations of the connectors used to wire external
function relay drivers, Master clock, and 911 control inputs, and communication ports (future addition).
P4 External Control Inputs
The terminal labeled CLOCK will reset the system time to 06:00 a.m. when shorted through a dry contact closure
from an external master clock (Bogen Time Systems Master Clocks).
P5 Relay Driver Outputs
Each relay driver output is an open collector output that goes low towards ground when activated. Each output is
activated by a DTMF sequence from an administrative telephone: 9421, 9422, 9423, 9424. Connect the external
relay and power supply (12V DC) between the desired output and one of the ground terminals.
Pin 10 of the P4 connector provides Audio Program Input (MCAPI2) #3 emergency priority page when shorted to pin
1 ground or Pin 2 ground through a customer-supplied contact closure.
Two card frames are interconnected by the MCJCA ribbon cable assemblies, as shown in Figure 15. Note that the
upper ribbon cable connector on both card frames must be installed so that the top four pins on each row of pins
are left exposed. The lower ribbon cable connector on both card frames must be installed so that the bottom four
pins on each row of pins are exposed (disregard the schematic representation of the connector printed on the back
plane when connecting the lower ribbon cable assembly).
Figure 15 - MCJCA Ribbon Cable Assemblies