Asl intercom BS 216 User Manual

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BASIC SERIES

USER MANUAL

FOR THE

BS 216

DUAL CHANNEL MASTER STATION

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 1

2.0 UNPACKING ................................. 1

3.0 MECHANICAL INSTALLATION ................... 1

4.0 MAINS POWER ............................... 2

5.0 FRONT PANEL CONTROLS ..................... 3

6.0 REAR PANEL CONNECTORS ................... 4

7.0 INTERNAL CONTROLS ........................ 4

8.0 CABLING .................................... 5

9.0 PARTY LINE, TECHNICAL CONCEPT ............. 6

10.0 GUARANTEE ................................. 6

11.0 TECHNICAL SPECIFICATIONS .................. 6

1.0 GENERAL DESCRIPTION

The BS 216 is designed to be a master unit in an ASL For each channel separately, the intercom line impedance intercom system and can be used in portable as well as circuitry is installed. fixed applications. It incorporates a dual channel intercom line power supply with aux input, a dual channel headset An AUX input at the rear panel, allows injecting external station and uses only 1U of 19" rack space. audio signals of line or mic level into the intercom lines.

When ‘mic level’is selected, +30V phantom power is This makes the BS 216 very versatile and ideal for use in available at the Aux input connector. applications where standard microphone cable is available and ease of setup is of paramount importance. Special attention has been paid to the intelligibility of

speech. By applying low noise/high speed circuitry, a Each channel has a Volume (listen level) control, a Talk speech presence filter and a specially designed and a Call button with LED indicators and a sidetone headphone amplifier, communication is very comfortable trimmer. even in environments with high background noise level.

The intercom line power supply is fully protected and can The unique ASL CALL system provides both a flashing red drive at least 10 beltpacks operating at full power. LED and a very distinctive and characteristic sound signal. The power supply is completely separated from all other Only a slight touch of the CALL button will make the LED functions and in case of power failure the unit can accept flash, whilst holding the button for two seconds will activate line power from an external ASL power supply. the call sound signal.

2.0 UNPACKING

The shipping carton contains the parts listed below. ASL has taken great care to ensure that this product

reaches you in flawless condition.

* The BS 216 After unpacking the unit please inspect for any physical * Power cable damage to the unit, and retain the shipping carton and * Spare fuses relevant packing materials for use should the unit need * User manual returning.

If any are missing contact your dealer. If any damage has occured, please notify your dealer

immediately so that a written claim can be initiated. Please With the BS 216 will be a small packet of spare fuses. also refer to the guarantee section of this manual. Please keep them in a safe place. There is also one spare fuse included in the mains inlet.

3.0 MECHANICAL INSTALLATION

A vertical rack space of 1U (1.75", 44mm) is required for the BS 216. It is not necessary to provide rear support by extra bracing or shelving.

Adequate ventilation must be provided by allowing sufficient space around the sides and rear of the unit to ensure free circulation of air. Forced cooling is not required.

The power supply is located on the left rear of the unit, and after a period of time it will feel hot to the touch. This is quite normal, and should be no cause for alarm.

4.0 MAINS POWER

IMPORTANT

The BS 216 may be connected to the mains power outlet The wires in this mains lead are colour coded in to which other audio equipment is connected. The outlet accordance with the following code: should have a clean earth. Avoid using mains power outlets which also power dimmer controlled lighting green and yellow Earth / safety ground equipment. blue Neutral

brown Live The used AC power source can be anything from 100 240 V AC, 50/60 Hz. There is no need to adjust the unit to As the colours of the wires in the mains lead may not the used mains voltage. correspond with the coloured markings identifying the

terminals in your plug, proceed as follows: The power cord supplied with this unit carries the following - The wire which is coloured green-and-yellow must be

information label: connected to the terminal in the plug which is marked

with the letter "E", or by the earth symbol which is or coloured green.

WARNING

This appliance must be earthed

- The wire which is coloured blue must be connected to the terminal which is marked with the letter "N" or coloured black.

- The wire which is coloured brown must be connected to the terminal which is marked with the letter "L" or coloured red.

Those units that are supplied to the North American market will have an integral moulded 3 pin connector which is provided to satisfy required local standards.

4.1 SAFETY EARTHING

The green-and-yellow wire of the mains cord must always be connected to the electrical installation safety earth or ground. It is essential for personal safety as well for proper operation of the BS 216 and the other connected stations. This wire is internally connected to all exposed metal surfaces and any rack framework into which this unit might be mounted is assumed to be connected to the same grounding circuit.

4.2 POWERING UP

Powering up procedure:

- Make sure that the red power switch on the left side of the front panel is OFF.

- Connect the power cord to the rear of the station.

- Plug the other end of the power cord into a PROPERLY GROUNDED outlet.

- Turn on the power with the red button, the green power LED will go on, indicating the station is active.

5.0 FRONT PANEL CONTROLS & CONNECTOR

1 POWER ON/OFF switch 5 SIDETONE trimmers

Mains power push button for switching ON and OFF These trimmers adjust the level of your own voice as the internal power supply. you hear it in your headset.

2 POWER LED

This LED illuminates if line power is supplied by the - set the trimmer in start position: fully clockwise. internal power supply. - switch off the microphone of all connected

3A BUZZER VOLUME trimmer

This trimmer adjusts the volume of the buzzer. - turn up the volume of the required channel.

3B BUZZER

This buzzer indicates an incoming or outgoing call. trimmer. It is activated by pressing a CALL button of the BS 216 or a CALL button of any other station on channel A or The operating area is between fully clockwise and B for longer than two seconds. minimum level. Adjusting the sidetone does not affect You can adjust its volume with the buzzer volume the level of your voice as it is heard by other stations. control.

4 VOLUME A & B control knobs

These knobs adjusts the listen level for the headset. separately or simultaneously. Each channel can be adjusted separately. The large green LED indicates if the talk function is

Adjustment procedure :

(speaker!) stations.

- switch on the microphone of the required channel.

- speak into the headset microphone.

- adjust the listen level by turning the sidetone

6 TALK A & B buttons

These buttons allow you to talk to each channel

activated.

7 CALL A & B buttons

These push buttons activate the CALL system. A momentary push will send a CALL signal to all stations connected to that intercom channel and the CALL LEDS will start flashing. Press and hold the buttons for 2 seconds will activate the call buzzer. After the CALL button is released the LEDS will continue to flash for a further 2 seconds.

8 AUX VOLUME controls

These knobs adjust the level of the Aux input signal to each of the two intercom lines.

9 HEADSET connector

A XLR-4 type connector for the connection of the local headset. This must have a can impedance of 200 ohms or greater. The mic may be of the dynamic or electret type.

Pin assignments:

1. shield mic. (GND)

2. mic. +

3. phones +

4. phones - (GND)

6.0 REAR PANEL CONTROLS & CONNECTORS

10 A & B line connectors 13 MAINS INLET

These XLR-3 type connectors are for connecting the IEC Mains connector. For correct wiring and operation remote-stations, via standard microphone cable. refer to section 4.0. There are two connectors for channel A and two connectors for channel B.

Pin assignments:

1. 0 V / ground shield

2. +30 V power wire

3. audio wire

11 AUX INPUT connector

This XLR-3 type aux input is electronically balanced and accepts audio levels between -16dBu to +22dBu on line leve, and -38dBu to +2dBu on mic level.

Before you plug in the mains voltage, check if:

The fuse is correct

WARNING

Pin assignments :

1. 0V / ground

2. Signal +

3. Signal -

When mic level is selected, a +30V DC phantom power is supplied to pins 2 and 3. The mic gain can be adjusted with the trimmer.

12 FUSE

This fuse protects the BS 216 against severe internal damage, in case of malfunction in the power section. To remove the fuse the mains cord must be removed.

It is most important to place the correct fuse in the holder : mains voltage fuse 100 - 240 VAC T 1250 mA

Spare fuses will be found in the small packet supplied with the unit.

7.0 INTERNAL CONTROLS

MIC GAIN

The mic gain can be adjusted internally by a trimmer located on the pcb near to the headset connections.

8.0 CABLING

For the BASIC Series Intercom system the interconnecting cables are of the shielded two-conductor microphone cable type and the intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power.

Since the audio signal is transferred in an way, certain rules have to be obeyed when installing the cables of an intercom network. This in order to avoid earth loops and to minimize power loss and the possible effect of electromagnetical fields.

These rules are:

Use high quality (multipair) cable.



For interconnecting user stations, power supplies and When two (two channel) units in a network are accessories in an ASL Intercom network, use high connected by more than one cable, make sure that quality shielded two-conductor (minimum 2x 0.30 mm2) these cables are parallel to each other over the whole microphone cable only. distance between those units. When using multipair In case of a two channel intercom network, use high cable, parallelism is ensured in the best possible way. quality microphone 'multipair' cable only, each pair consisting of two conductors (minimum 2x 0.15 mm2) with separate shield. Multipair cable should also have Always avoid that cables are making a loop. So-called an overall shield. 'ring intercom' should not physically be cabled as a

Use flexible cables.

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Use flexible single and multipair microphone cable power supply position) as the centre of the star. instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. Keep intercom cables away from high energy cables,

Separate cable screen to XLR pin 1.

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The screen of each separate microphone cable and/or Intercom cables should cross high energy cables in at the screen of each single pair in a multipair cable, angle of 90( only. should be connected to pin 1 of each XLR-3 connector. Intercom cables should never be in the same trunking Do not connect this cable screen to the metal housing with energy cables. of the connector or to metal wall boxes (outlets). See page 10 for Earthing Concept.

Cable trunks, connection boxes and overall

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multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall user stations are placed. multipair cable screen should be interconnected and, at one point (the 'central earthing point') in the intercom network only, be connected to a clean earth or a safety earth. The ASL power supply may be connected to the mains See page 10 for Earthing Concept. power outlet to which other audio equipment is

Keep metal connection boxes and cable housings



isolated from other metal parts.

Metal housings for intercom cables and connectors In case of more complex installations, don't hesitate to should be mounted in such a way that they are isolated contact us. Please send us a block diagram of the planned from other metal cable and connector housings and network with a list of all user stations and their positions, from any other metal construction parts. and we are happy to advise you on cabling lay out.

unbalanced

Keep cables parallel as much as possible.

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Avoid closed loops.

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ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the

Keep cables away from electromagnetic sources.

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e.g. 110/220/380V mains power or dimmer controlled feeds for spotlights.

Place power supply in a central position.

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In order to avoid unacceptable power losses, place the power supply as close as possible to where most power consumption occurs or, in other words, most

Connect ASL power supply to a 'clean' mains

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outlet.

connected. Avoid using mains outlets which also power dimmer controlled lighting systems.

See Party Line, Technical Concept

9.0 PARTY LINE, TECHNICAL CONCEPT 11.0 TECHNICAL SPECIFICATIONS BS 216

ASL's BASIC Series offers a complete two way ('full duplex') communications system. mains voltage range 100 - 240 V 50/ 60Hz AC Users of the system are connected via a 'party line'. DC output voltage +30 V +/-5% DC Master stations (with built-in power supply), beltpacks ripple and noise < 11 mV rms and power supplies are interconnected via standard max. output current 1.8 A continuous /2.31 A peak microphone cable. One wire is used as an audio line, one as a power line and the screen of the cable functions as earth/return. mic. impedance 200 ohms

Current drive is used for signal transfer. Each station presence filter +6 dB at 5 kHz utilises a current amplifier to amplify the microphone signal frequency response 200 Hz - 13 kHz (-3 dB) and place it on the common audio line where, due to the V electret mic + 9 V DC constant line impedance (situated in the power supply between XLR pin 3 and 1), a signal voltage is developed which can be further amplified and sent to the max. load 200 ohms headphones. max. output level 8 V rms (200 ohms)

This principle has three advantages:

- the use of a single audio line allows several stations to talk and listen simultaneously. rejection 0 - 30 dB adjustable

- due to the high bridging impedance offered by each station, the number of stations 'on line' has no influence on the level of the communications signal. max. SPL 100 dBA

- power and audio to the intercom stations use the same cable.

The Call signal is also sent as a current on the audio line. 4.6 Kohms (balanced mic level) It develops a DC potential over the line impedance which Nominal input level -18 dBu to +6dBu (line level) will be sensed by each station and interpreted as a Call -38 dBu to -14 dBu (mic level) signal. max. input level +22 dBu (line level)

POWER SUPPLY

MIC. PREAMP

gain 40 dB - 70 dB (adjustable internally)

HEADPHONES DRIVER AMP

max. output power 0.16 W rms (each can)

SIDETONE

BUZZER

AUX INPUT

Input impedance 30 Kohms (balanced line level)

+2 dBu (mic level) Phantom power +30V DC (mic level selected)

10.0 GUARANTEE

This unit is warranted by ASL Intercom to the original enduser purchaser against defects in workmanship and materials in it's manufacture for a period of one year from date of shipment to the end-user.

Faults arising from misuse, unauthorised modifications or accidents are not covered by this warranty. If the unit is faulty it should be sent in it's original packing, to the supplier or your local ASL dealer, with shipping prepaid. A note must be included stating the faults found and a copy of the original suppliers invoice.

THIS PRODUCT WAS DESIGNED, DEVELOPED AND MANUFACTURED BY:

ASL-intercom BV MAARSSEN (UTRECHT) HOLLAND.

DIMENSIONS AND WEIGHT

width 19" (483 mm) height 1U (44.5 mm) depth 124 mm weight 1.85 Kg

GENERAL SYSTEM SPECIFICATIONS

intercom line impedance 350 ohms (1kHz)

2.2 Kohms (DC)

intercom line audio level nom. -18 dBu

max. +4 dBu dynamic range 80 dB call send signal 2.8 mA call receive signal threshold +2.4 V DC supply voltage +30 V DC (12 V to 32 V)

Note: 0 dBu = 775 mV into open circuit. ASL reserves the right to alter specifications without further

notice.

Asl intercom BS 216 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual