Telex Audiocom US-2000 User manual

Telex®

Operating Instructions

US-2000

User Station

Audiocom®Intercom

System

US-2000

Mic Kill

Headset

Panel Mic

Vox

SideTone

All Talk

Listen Listen

Call Call

Talk Talk

Volume

GENERAL

The Audiocom® US-2000 is a microprocessor controlled two-channel

intercom user station, that occupies only 1/2-rack space. The US-2000

can communicate with an entire intercom system or an individual

channel, and can be expanded up to 18 channels. ES-4000 Expansion

Stations can be “daisy chained” to the US-2000 to add four channels at a

time to the intercom system. Each channel can be programmed for talk,

listen or both. The US-2000 can use mono or stereo headsets, or panel

mounted microphone. VOX operation can be selected for either headset

or panel microphone. Internal switch and jumper settings allow the unit

to be used with Clear-Com® components, if desired. Other internal

switch and jumper settings allow the unit to be uniquely configured to the

operator’s requirements.

FCC STATEMENT

This equipment uses, and can radiate radio frequency energy that may

cause interference to radio communications if not installed in accordance

with this manual. The equipment has been tested and found to comply

with the limits of a Class A computing device pursuant to Subpart J, Part

15 of FCC Rules which are designed to provide reasonable protection

against such interference when operated in a commercial environment.

Operation of this equipment in a residential area may cause interference

which the user (at his own expense) will be required to correct.

This product meets the Electromagnetic Compatibility Directive,

89/336/EEC.

OPERATION

SYSTEM POWER

The US-2000 receives power externally, in one of two ways:

·Via the

12-15 VDC

power input jack

·Via

CHN 1

CHN 2

, intercom channel connectors

®Clear-Com is a registered trademark of Clear-Com Intercom Systems

® Audiocom is a trademark of Telex Communications, Inc., Minneapolis, Minnesota 55420

12-15 VDC

TELEX COMMUNICATIONS, INC. MADE IN USA

US-2000

17 13161514

123 6710108 9 12 12

SPEAKERS

PROGRAM

INPUTS

LINE LEVEL

1 VRMS

P.A. EXP

OUT

Mic KillHeadset

PAPanel Mic

Vox

Side Tone

All Talk

Listen Listen

Call Call

Talk Talk

Volume

CHN 2

VOL

PGM 2

VOL

PGM 1

PUSH

CHN 1

11 11

PUSH

Figure 1. Front and Rear Panel Controls

INITIAL US-2000 SETUP

The channel termination is initially set for balanced operation, which is

compatible with other Audiocom® equipment. If the unit is going to be

connected to Clear-Com equipment, two jumpers and one switch must

be changed as described in the section on Clear-Com Setup in this

manual.

The US-2000 is factory set to allow all channels (including those of any

attached ES-4000 units) to be heard through a single powered speaker,

such as the Audiocom® SPK-1000. If the user wants to have each

channel go to a separate powered speaker, three jumpers must be

changed as described in the section on Speaker Setup in this manual.

The headset microphone termination is initially set for unbalanced

operation. To change the headset microphone termination, refer to

Table 2 in this manual for the position of jumper J16. If the termination

requirement of a headset microphone is unknown, the recommended

setting is unbalanced.

MICROPROCESSOR FUNCTIONS

RESET: Simultaneously press

All Talk

and channel 1

Listen

keys to

reset the US-2000 microprocessor to its power-up state.

TEST SIGNAL: Simultaneously press

All Talk

and

keys to cause the

microprocessor to generate 1 kHz test signal. Press any US-2000 or

ES-4000

Call

key to send the test signal down that channel. Press the

same

Call

key to stop the test signal on that channel, then press any

other key on that unit (except

Call) to exit the test signal function.

EXTERNAL CONNECTIONS & CONTROLS

NOTE: The numbers refer to the callouts in Figure 1.

1. Mono Headset Connector

This connector accepts a Telex® boom-microphone headset.

2. Panel Microphone or Stereo Headset Connector

This connector accepts a Telex® gooseneck microphone (model

EGM-12N or EGM-18N) or stereo headset.

3. VOLUME

Control

Use this control to adjust the headset listen level.

SIDETONE

Control

When using a headset, this control adjusts your own voice level

heard in the earphones. To adjust the level, tap the

Headset

key

once to turn on the headset microphone. Then, use a small

flat-blade screwdriver to increase or decrease your voice level while

talking into the microphone.

VOX

Level Adjustment

There are separate

VOX

level controls for headset and panel micro-

phone. These adjust the voice level required to activate the micro-

phone when VOX mode is on.

To adjust the headset VOX level, place the

Headset

microphone key

in VOX mode (see 6 below). While talking into the headset micro-

phone in a normal voice, use a small flat-blade screwdriver to adjust

the

VOX

control to the desired voice activation level. The

Headset

microphone key will turn from orange to green as the microphone

turns on.

Use the same procedure to adjust the panel microphone VOX level

using the

Panel Mic

key and

VOX

level control.

Headset

and

Panel Mic

keys

The

Headset

key activates the headset microphone. The

Panel Mic

key activates the panel microphone. Either key selects one of three

modes of microphone operation:

Latched Mode:

Tap the key once to turn the headset or panel microphone on.

The key will glow green. Tap the key again to turn the headset

or panel microphone off.

Momentary Mode:

Press and hold the key to momentarily turn on the headset or

panel microphone. Release the key to turn the headset or panel

microphone off.

VOX Mode:

With the headset or panel microphone off, tap the key twice to

turn on VOX mode. The key will glow orange when there is no

audio present, and green when you talk into the headset or

panel microphone. (When in VOX mode you may have to adjust

the

VOX

level.) Tap the key once to turn off VOX mode.

All Talk

key

The All Talk function allows the user to talk on all attached channels

simultaneously. To activate this function with either the

Headset

Panel Mic

selected, press and hold the

All Talk

key to talk on all

US-2000 and ES-4000 channels at once. The key will glow green.

key

The PA function allows the user to talk over a public address system

that is connected to the rear of the US-2000. With either the

Head-

set

Panel Mic

selected, press and hold the

key to talk on a

public address system connected to the

P.A.

output jack on the back

panel of the US-2000. The key will glow green.

Mic Kill

key

This key controls three features:

Microphone Kill Feature:

This feature sends a signal that causes the intercom stations on

a selected channel to turn off any activated microphones on that

channel. (Works with US-2000, ES-4000, SS-1000, BP1000 and

BP2000 stations.) Tap the key once to access this feature. The

key will blink green. To turn off all activated microphones on any

channel, press the

Talk

Listen

key for the desired channels.

To turn off all microphones on all channels, press the

All Talk

key. Tap the

Mic Kill

key to exit.

Program Kill Feature:

This feature allows the program audio to be individually disabled

on each channel. Press and hold the key to access this feature.

The key will glow green and the current Program Kill status will

be displayed (when a

Talk

key is lit, program audio is enabled on

that channel). Press a

Talk

key to enable or disable program au-

dio on that channel. Tap the

Mic Kill

key to exit the feature

setup.

Headset Audible Call Alert Feature:

This feature will cause an audible beep in the headset whenever

there is an incoming call from any channel. Press and hold the

key to access this feature. The key will glow green and the cur-

rent Headset Audible Call Alert status will be displayed (when

both

Call

keys are lit, Headset Audible Call Alert is enabled).

Press either

Call

key to enable or disable Headset Audible Call

Alert on both US-2000 channels. Tap the

Mic Kill

key to exit the

feature setup.

10.

Talk

keys

There is a

Talk

key for each channel. With either the

Headset

Panel Mic

selected, the

Talk

keys operate in two ways:

Latched Mode:

Tap the key once to talk. The key will glow green. Tap the key

again when finished with a conversation.

Momentary Mode:

Press and hold the key to talk momentarily. Release the key

when finished talking.

11.

Call

keys

The Call function allows the user to signal other devices on the inter-

com system. There is a

Call

key for each channel. The

Call

keys

operate in two ways:

Call receive:

When there is an incoming call signal, the key blinks red. (If

Headset Audible Call Alert is enabled, incoming calls will cause a

beep in the headset.) To respond to an incoming call, turn on

the

Talk

key for that channel and begin talking.

Call send:

To send a call signal to a station on a channel, press and hold

the

Call

key until a verbal response is received. The

Listen

key

for that channel automatically turns on when the

Call

key is

pressed.

12.

Listen

keys

There is a

Listen

key for each channel. The

Listen

keys operate in

two ways:

Latched Mode:

Tap the key once to turn on listen. Tap it again to turn off listen.

The key glows green when listen is on.

Momentary Mode:

Press and hold the key to listen momentarily. Release the key to

turn off listen.

13.

Program Inputs

Connector and Program Volume Controls

In a television studio intercom system, the program input is usually

the actual program audio signal. In another intercom system, the

program input can be any auxiliary audio signal, such as background

music.

There is a separate program input for each channel (see Connector

Pin Configurations for connector details). The

VOL PGM 1

control

adjusts the program 1 level heard on intercom channel 1. The

VOL

PGM 2

control adjusts the program 2 level heard on intercom chan-

nel 2. As supplied, the US-2000 does not interrupt the program in-

puts during talk. Program interrupt during talk requires an internal

switch change (see Table 1, switches SW2-4 and SW2-5).

14.

12-15 VDC

Input Jack

Normally the US-2000 is powered from the intercom system and will

turn on with the intercom system. The US-2000 may also be pow-

ered from an optional Telex® Wall Pack (part number 532006-000).

Plug the Wall Pack into the

12-15 VDC

jack and into an AC outlet.

15.

P.A.

Output Jack

To use the US-2000 with a public address system, connect this jack

to the input of the public address amplifier.

16.

EXP OUT

Jack

Connects audio and data to the EXP IN jack of an optional Telex®

ES-4000 expansion station.

17.

SPEAKERS

Output Jacks

Connects channel audio to the Input jacks of an optional Telex®

SPK-1000 Powered Speaker. May also be connected to the auxil-

iary input of an amplifier. These outputs should not be directly con-

nected to an unpowered speaker. Refer to the speaker setup

section in this manual.

18.

CHN 1

and

CHN 2

Intercom Channel Connectors

Each intercom channel has a pair of connectors (one male and one

female) for convenient interconnection of stations. Each pair of con-

nectors is wired together in parallel, providing a “loop through” at

each connector pin. Use one connector of each pair to connect to

the intercom power supply. Use the other connector of each pair to

run a cable to another user station.

CHANNEL TERMINATION

Each channel of the US-2000 must be terminated to prevent audio

oscillations. When a channel is connected to a Telex® power supply,

channel termination is provided within the power supply for that channel.

External channel termination must be installed when a channel is:

·Used in a “dry-line” (non-powered channel) application

·Unused and un-powered

If necessary, install external channel termination by connecting a 300W

resistor across pins 2 and 3 of the intercom channel connector (either

CHN1

CHN2

) at the rear of the US-2000.

INTERNAL SWITCHES, JUMPERS AND ADJUSTMENTS

There are several internal switches, jumpers and adjustments that affect

operation. These are described below. To gain access to the switches,

jumpers and adjustments, remove one screw from the top of the cover

and two screws on each side. Switch, jumper and adjustment locations

are shown in Figure 2. The adjustments are also accessible from the

underside of the US-2000, as shown in Figure 3.

NOTE: To activate a changed switch or jumper setting, either

perform a RESET or cycle the power on and off.

SW1

SW2

J17

J19

J16

R188 R187

R198

J21

J22

J23

J20

J24

Figure 2. Internal Switches, Jumpers and Adjustments

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