Bogen MCTWA Installation And Use Manual

Two Wire Adapter

Model MCTWA

Installation and Use Manual

Description

The MCTWA is a two-wire adapter card designed for use with Multicom® 2000 systems and Multi-Graphic® rack
products.The MCTWA eliminates the need for a third annunciator lead for call switches. It has an added feature of
balanced bridge call detection, which virtually eliminates false call-in. Common return wiring eliminates the need for
isolated speaker shields.

When used with Multicom 2000 systems, the MCTWA will allow normal, urgent, and emergency signaling on two
wires.When used with Multi-Graphic products, the Model SCR25A adapter board is also required. (See

and

1b on back.)

The MCTWA operates from 24V DC, at a maximum of 2.4 watts per adapter. The Bogen RF24A power supply is
recommended and can supply power for up to

10 MCTWA boards. (See Figure 2.)

The MCTWA stations can also be configured in the four-wire mode. (See Figure 3.)

Figures 1a

Installation Instructions

Insert the MCTWA onto the Model MCRM relay module. Use the mounting holes provided to secure the MCTWA
to the MCRM.

Specifications

Functions: Provides common mode call-in signaling on speaker lines, eliminating the need for an

unciator lead

ann

Terminations: 0.156 centerline connectors

ICs: 12 high-performance operation amplifiers

Power Required: 24V DC at 2.4 watts per board

Dimensions: 16-3/4" W x 1-1/8" H x 4-5/8" D

© 2005 Bogen Communications, Inc.
All rights r
Specifications subject to change without notice.
54-5940-0

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Figure 1a. Example of common wire return path

Figure 2. Example of power supply connection

Figure 1b. Example of conductive conduit or cold water

pipe return path

Figure 3. Example of four-wire connection