BS 216
DUAL CHANNEL MASTER STATION
USER MANUAL
October 2013
This product is designed and manufactured by:
ASL Intercom B.V.
Zonnebaan 42
3542 EG Utrecht
The Netherlands
Tel: +31 (0)30 2411901
Fax: +31 (0)30 2667373
Email: info@asl-inter.com
Web: www.asl-inter.com
CONTENT OF THIS USER MANUAL
1.0
SAFETY INSTRUCTIONS ................................................................ 3
2.0
GENERAL DESCRIPTION ................................................................ 4
3.0
MECHANICAL INSTALLATION ......................................................... 4
4.0
MAINS POWER & SAFETY EARTH ................................................. 4
5.0
FRONT PANEL CONTROLS & CONNECTOR ................................. 5
6.0
REAR PANEL CONTROLS & CONNECTORS ................................. 6
7.0
INTERNAL CONTROLS .................................................................... 6
8.0
TECHNICAL SPECIFICATIONS ....................................................... 6
9.0
PARTY LINE, TECHNICAL CONCEPT ............................................. 7
10.0
CABLING ......................................................................................... 7
11.0
EARTHING CONCEPT .................................................................... 8
12.0
BS 216 BLOCK DIAGRAM ............................................................. 8
13.0
POSSIBLE SYSTEM CONFIGURATION ........................................ 9
PAGE 2
User Manual BS 216 / October 2013 © ASL Intercom BV
1.0
SAFETY INSTRUCTIONS
Please always follow these instructions to help ensure against injury to yourself
and/or damage to the system
1. Read all safety and operating
instructions before you operate the
apparatus.
2. Retain all safety and operating
instructions for future reference.
3. Heed all warnings on the apparatus and
in the safety and operating instructions
and follow all installation and use
instructions.
4. Follow all installation, operating and use
instructions
5. Unplug the apparatus from the AC power
outlet before cleaning. Use only a damp
cloth for cleaning the exterior of the
apparatus.
6. Do not use accessories or attachments
not recommended by the manufacturer,
as they may cause hazards and void the
warranty.
7. Do not operate this apparatus in high
humidity areas or expose it to water or
moisture.
8. Do not place the apparatus on an
unstable cart, stand, tripod, bracket or
table. The apparatus may fall, causing
serious personal injury and damage to
the apparatus.
9. Do not block or cover any openings in
the apparatus. These are provided for
ventilation and protection from
overheating. Never place the apparatus
near any heat sources such as radiators,
heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
Do not place the apparatus in an
enclosure such as a cabinet without
proper ventilation.
10. Operate the apparatus using only the
type of power source indicated on the
marking label. Unplug the apparatus’
power cord by gripping the power plug,
not the cord.
11. Insert the plug properly. Do not defeat
the safety purpose of the polarized or
grounding-type plug. An American
polarized AC line plug has two blades
with one wider than the other. This plug
will fit only one way into the power outlet.
This is a safety feature. If you are unable
to insert the plug fully into the outlet, try
reversing the plug. If the plug still fails to
fit, contact an electrician to replace the
obsolete outlet. A grounding type plug
has two blades and a third grounding
prong. The wide blade or the third prong
are provided for your safety. If the
provided plug does not fit into your
outlet, consult an electrician to replace
the obsolete outlet.
12. Route power supply cords so that they
are not likely to be walked on or pinched
by items placed upon or against them.
Pay particular attention to cords at plugs,
convenience receptacles, and the point
where they exit from the apparatus.
13. Do not overload wall outlets or extension
cords, as this can result in a risk of fire or
electrical shock.
14. Unplug this apparatus during lightning
storms or when unused for long periods
of time.
15. Never insert objects of any kind into the
apparatus through openings, as the
objects may touch dangerous voltage
points or short out parts. This could
cause fire or electrical shock.
16. Refer all servicing to qualified service
personnel. Servicing is required when
the apparatus has been damaged in any
way, such as when the power-supply
cord or plug is damaged, liquid has been
spilled or objects have fallen into the
apparatus, the apparatus has been
exposed to rain or moisture, does not
operate normally, or has been dropped.
PAGE 3
User Manual BS 216 / October 2013 © ASL Intercom BV
2.0
GENERAL DESCRIPTION
The BS 216 (19”/1RU) is designed to be a
master station in an ASL intercom system.
To connect the unit to its remote intercom
stations, use professional microphone cable
(2 conductors and 1 shield) only.
Each channel has a Volume (listen level)
control, a TALK and a CALL button with LED
indicators.
With a headset connected to the XLR-4
headset connector one can talk and listen to
each channel separately or to both channels
simultaneously. With side tone trimmers one
may adjust the listen level of one’s voice in
one’s headset.
The built-in power supply is fully protected
against short circuit or excessive thermal
condition and can safely drive up to 15 Basic
Series beltpacks operating at full power.
3.0
When ‘mic level’ is selected, +30V phantom
power is available at the Aux input connector.
The unique ASL Call system provides both a
flashing red LED and a very distinctive sound
signal. A slight touch of the CALL button makes
the call LED flash, whilst holding the button for
2 seconds the call sound signal is activated.
Special attention has been paid to the
intelligibility of speech. By applying low
noise/high speed circuitry, a speech presence
filter and a specially designed headphone
amplifier, communication is very comfortable
even in environments with high background
noise levels.
MECHANICAL INSTALLATION
For the BS 216 a vertical rack space of 1U
(1.75”, 44mm) is required. 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
4.0
An Aux input connector at the rear panel allows
injecting external audio signals of line or mic
level into the intercom lines.
circulation of air.
Forced cooling is not required.
The power supply regulator is mounted on the
rear of the unit; after a period of time it will feel
hot to the touch. This is quite normal, and
should be no cause for alarm.
MAINS POWER & SAFETY EARTH
Connecting to mains power:
The BS 216 may be connected to a mains power
outlet which provides 100 – 240 V AC, 50-60 Hz
and at least 60 watts. The outlet should have a
clean earth. Avoid using mains power outlets
which also power dimmer controlled lighting
equipment.
The wires in the mains lead are color coded:
green/yellow:
Earth / safety ground
blue:
Neutral
brown:
Live
In case the wires in the mains lead do not
correspond with the colored markings identifying
the terminals in your mains plug, proceed as
follows:
• The wire which is colored green/yellow
must be connected to the terminal in the
plug which is marked with the letter “E”, or
by the ground symbol, or is colored green.
•
•
The wire which is colored blue must be
connected to the terminal which is marked
with the letter “N” or colored black.
The wire which is colored brown must be
connected to the terminal which is marked
with the letter “L” or colored red.
Safety Earth:
The green/yellow wire of the mains lead must
always be connected to the electrical
installation safety earth or ground.
This is essential for personal safety as well as for
proper operation of the BS 216 and the other
connected stations. The green/yellow wire is in
the BS 216 connected to all exposed metal
surfaces. Any rack framework into which this unit
might be mounted is assumed to be connected to
the same grounding circuit.
5.0
FRONT PANEL CONTROLS & CONNECTOR
1
POWER ON/OFF switch
Mains power push button for switching ON and
OFF the internal power supply.
2
MAINS POWER LED
This LED illuminates if line power is supplied by
the internal power supply.
3A
BUZZER VOLUME trimmer
This trimmer adjusts the volume of the buzzer.
3B
BUZZER
This buzzer indicates an incoming or outgoing
call. It is activated by pushing a CALL button on
this station or a CALL button on any other
station for longer than two seconds.
The volume of the buzzer may be adjusted with
the buzzer volume control.
4
VOLUME A & B control knobs
These knobs adjust the listen level for the
headset. Each channel has to be adjusted
separately.
5
SIDE TONE trimmers
These trimmers adjust the level of one’s voice
as heard in one’s headset.
Adjustment procedure (for each channel
separately):
• set the trimmer in start position: fully
clockwise
• switch off the microphones of all
connected stations
• push the TALK button of the channel
• turn up the volume of the channel
• speak into the headset microphone
• adjust the listen level by turning the side
tone trimmer of the channel.
The trimmer operating area is between fully
clockwise and minimum level. Adjusting the
side tone does not affect the level of your voice
as heard by other stations.
6
TALK A & B buttons + LED’s
These buttons allows the user to talk to each
channel separately or to both channels
simultaneously. The large green LED’s indicate
if the talk function is activated.
7
CALL A & B buttons + LED’s
A Call button activates the Call system.
By a momentary push a Call signal is sent to all
stations connected to the referring intercom
channel. The Call LED on this station and on all
to the channel connected stations starts
flashing. Pushing and holding a Call button for
2 seconds activates the call buzzer in all
stations. After the CALL button is released the
Call LED’s continue to flash for a further 2
seconds.
8
AUX VOLUME controls A & B
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 to connect a headset.
The can impedance must be minimum 200
ohms. The headset microphone may be of the
dynamic or electret type.
Pin assignments:
Pin 1:
Pin 2:
Pin 3:
Pin 4:
PAGE 5
User Manual BS 216 / October 2013 © ASL Intercom BV
shield mic. (GND)
mic. +
phones +
phones –
6.0
REAR PANEL CONTROLS & CONNECTORS
10
MAINS Inlet
IEC Mains connector
11
FUSE Holder
The fuse protects the BS 216 against severe
internal damage, in case of malfunction in the
power section. Before replacing a fuse the
mains cord must be disconnected from the
mains outlet.
12
AUX INPUT connector
This aux signal input is electronically balanced
and accepts audio levels between –18dBu to
+22dBu on line level, and –38dBu to +2dBu on
mic level. When mic level is selected, +30 V DC
phantom power is supplied to the XLR-3 aux
input connector. Pin assignments :
Pin 1.
0V / ground
Pin 2:
signal +
Pin 3:
signal –
7.0
13
INPUT LEVEL Switch
When mic level is selected, +30V DC phantom
power is supplied to pins 2 and 3 of the XLR-3
aux input connector.
14
MIC GAIN Trimmer
To adjust the input gain when mic level is
selected (see #13)
15
A & B LINE connectors
These XLR-3 type connectors are for
connecting remote stations, using standard
microphone cable. There are 2 connectors for
channel A and 2 connectors for channel B.
Pin assignments:
Pin 1:
Pin 2:
Pin 3:
0V / ground shield
+30V DC power wire
audio wire
INTERNAL CONTROLS
MIC GAIN: The mic gain is adjusted by a trimmer located on the PCB near the headset connectors
.
8.0
TECHNICAL SPECIFICATIONS
System
Dynamic range: 80 dB (1kHz, THD <1%)
Frequency response: 200 Hz - 15 kHz (-3 dB)
Call signal (send): +2.8 mA
Call signal threshold (receive): +2.4 V DC
Operating voltage: 24 - 32 V DC
Mic Pre-amp
Gain: 40 - 60 dB (adjustable internally)
Presence filter: +6 dB @ 5 kHz
Power to electret mic: +9 V DC
Intercom line
Impedance: 350 Ω (1 kHz), 2.2 kΩ (DC)
Audio level: nom. -18 dBu, max. 0 dBu
Buzzer
Switch Mode Power Supply
Mains voltage: 100 - 240 V AC, 50/60 Hz
Output voltage: +30 V DC (+/- 5%)
Max output power: 45 W
Max power consumption BS 216: 60 watts
Headphone Driver Amp
Max. output level: 11.6 Vrms (at 200 Ω)
Max. output power: 0.7 Wrms (at 200 Ω)
Side Tone Rejection: 0 - 30 dB adjustable
Max. SPL: 85 dBA
Aux Input
Input Impedance:
30 kΩ (line level)
4.6 kΩ (mic level)
Nominal Input Level:
0 dBu (line level)
-30 dBu (mic level)
Max. Input Level:
+22 dBu (line level)
0 dBu (mic level)
Phantom Power:
+30 V DC (mic level selected)
0 dBu defined as 775 mV rms into open circuit.
ASL reserves the right to alter specifications without prior notice
PAGE 6
User Manual BS 216 / October 2013 © ASL Intercom BV
9.0
PARTY LINE, TECHNICAL CONCEPT
User stations in an ASL intercom system are
connected via one or several 'party lines'. A party
line offers two way (‘full duplex’) communication and
consists of standard microphone (multi-pair) cable.
One wire is used as an audio line, one as a power
line and the screen of the cable functions as
earth/return.
Current drive is used for signal transfer. Each station
utilizes a current amplifier to amplify the microphone
signal and place it on the common audio line where,
due to the 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 headphones or loudspeakers.
10.0
This principle has three advantages:
• the use of a single audio line allows several
stations to talk and listen simultaneously
• due to the high bridging impedance offered
by each station, the number of stations on
the party line has no influence on the level
of the communications signal
• power and audio to the intercom stations
use the same cable
The Call signal is also sent as a current on the audio
line. It develops a DC potential over the line
impedance which will be sensed by each station and
interpreted as a Call signal.
CABLING
The intercom lines (the ‘party lines’) are of the shielded two-conductor microphone cable type. 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.
The audio signal is transferred in an unbalanced way (see ‘Party Line, Technical Concept’).
To avoid earth loops (hum), the possible effect of electromagnetic fields and to minimize power loss, certain rules
have to be obeyed when installing the cabling of an intercom system :
Use high quality cable
Use high quality microphone cable (shielded two
conductor cable, minimum 2x 0.30 mm2).
In case multi-pair microphone cable is used, it
should be of high quality and each pair should
consist of two conductors (minimum 2x 0.15 mm2)
with separate shield and an overall shield.
Keep cables parallel as much as possible
When two (multi channel) units in a network are
connected by more than one cable, make sure that
these cables are parallel to each other over the
whole distance between those units. When using
multi-pair cable, parallelism is ensured in the best
possible way.
Use flexible cable
Use flexible single and multi-pair microphone cable
instead of cable with solid cores, especially when
the cable is subjected to bending during operation or
installation.
Avoid closed loops
Always avoid that intercom cables are making a
closed loop. So-called 'ring intercom' should not
physically be cabled as a ring..
Cable screens to XLR pin 1
The screen of each separate microphone cable
and/or the screen of each single pair in a multi-pair
cable, should be connected to pin 1 of each XLR-3
connector. Do not connect these screens to the
metal housing of ASL unitst or XLR-3 wall boxes.
See section ‘Earthing Concept’.
Keep cables away from electromagnetic sources
Keep intercom cables away from high energy
cables, e.g. 115/230/400V mains power or dimmer
controlled feeds for spotlights. Intercom cables
should cross high energy cables at an angle of 90º
only. Intercom cables should never be in the same
trunks as energy cables.
Connect metal cable trunks, wall boxes and
overall multi-pair cable screens to clean earth
Metal cable trunks, metal wall boxes and overall
multi-pair cable screens should be interconnected
and, at the 'central earth point' in the intercom
network only, be connected to a clean earth or a
safety earth. (see section ‘Earthing Concept’).
Place power supply in a central position
In case of a system powered by a separate power
supply: In order to diminish power losses, place the
power supply as close as possible to where most
power consumption occurs, in other words most
user stations are placed.
Keep metal connection boxes and cable trunks
or pipes isolated from other metal parts
Metal trunks or pipes for intercom cables and metal
connection boxes should be mounted in such a way
that they are isolated from any other metal housing
or construction part.
ASL powered units to a 'clean' mains outlet
Master stations or power supplies should be
connected to a mains outlet with a clean earth.
Other audio equipment may be connected to this
mains outlet, but avoid using an outlet which also
powers dimmer controlled lighting systems.
PAGE 7
User Manual BS 216 / October 2013 © ASL Intercom BV
11.0
EARTHING CONCEPT
12.0
BS 216 BLOCK DIAGRAM
PAGE 8
User Manual BS 216 / October 2013 © ASL Intercom BV
13.0
POSSIBLE SYSTEM CONFIGURATION
PAGE 9
User Manual BS 216 / October 2013 © ASL Intercom BV
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