Beyerdynamic MCS 20 Operating Instructions Manual
BEDIENUNGSANLEITUNG
OPERATING INSTRUCTIONS
NOTICE D’UTILISATION
MCS 20
Kabelgebundenes Konferenzsystem
Wired Conference System
Système de conférence à fil
MCS 20 – Contents
35
english
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2. MCS 20 power supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.1 Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.2 Controls and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.4 Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3. Microphone units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.1 Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.2 MCS 221 delegate microphone unit – controls and indicators . . . . . . . . . . . . 40
3.2.1 How to operate the MCS 221 delegate microphone unit. . . . . . . . . . . . . . . . 41
3.2.2 Configuration switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.3 MCS 223 chairman microphone unit – controls and indicators. . . . . . . . . . . . 44
3.3.1 How to operate the MCS 223 chairman microphone unit . . . . . . . . . . . . . . . 44
3.3.2 Operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.3.3 Priority function (Prior). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3.4 Clear function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3.5 How to adjust the limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3.6 How to adjust the volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.3.7 How to set the timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.3.8 Programming mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.3.9 Table of programmble functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.4 MCS 263 system unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.1 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.2 MCS 263 configuration switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.4.3 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3.4.4 How to use the MCS 263 as a delegate microphone unit. . . . . . . . . . . . . . . . 58
3.4.5 How to use the MCS 263 as a sub-chairman microphone unit. . . . . . . . . . . . 59
4. Examples for a system configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
5. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.1 Supplied accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.2 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8. Cable specifications for self-made cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
EC-Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
MCS 20 – Power Supply Unit
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Thank you for selecting the wired MCS 20 conference system from beyerdynamic. Please take some time to read
through this manual carefully before using this product.
One system includes the following components:
• MCS 20 power supply unit
• MCS 221 delegate microphone unit
• MCS 223 chairman microphone unit
• MCS 263 system unit
1. Introduction
The MCS 20 system from beyerdynamic is a reliable conference system which provides versatility, easy handling and
quality. The system is controlled by a micro processor which is integrated in the MCS 223 chairman microphone unit.
All functions feature a solid-state control which is electronically precise. The MCS 221 and MCS 223 microphone
units consist of a microphone and loudspeaker as well as a connection for a headphone. The MCS 263 system unit
also provides connections for microphone, loudspeaker and headphone. An additional loudspeaker system can be
connected to the MCS 20 power supply unit, but not necessarily. The decentral sound system avoids runtime
effects and echoes to ensure a perfect communication at each seat. The gooseneck microphones and loudspeakers
contribute to an excellent and natural audio quality. The handling is very easy and the chairman controls the meeting
with his/her microphone unit.
The standard cable configuration is a daisy chain connection of all devices in the system. The single cable system
allows any other configuration.
T-adapters are available for branches. Please note, the maximum number of microphone units that can be turned on
is limited for one power supply unit. More microphone units, however, can be turned on, when the power supply
unit is cascaded.
2. MCS 20 power supply unit
2.1 Safety information
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers)
that produce heat.
9. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
10. Only use attachments/accessories specified by the manufacturer.
11. Unplug this apparatus during lightning storms or when unusued for long periods of time.
12. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in
any way, such as 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 droped.
Exemption from liability
• beyerdynamic GmbH & Co. KG will not be liable if any damage, injury or accident occurs due to negligent,
incorrect or inappropriate operation of the product.
MCS 20 – Power Supply Unit
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Location
• The equipment must be set up so that the mains switch, mains plug and all connection on the rear of the device
are easily accessible.
• If you transport the equipment to another location take care to ensure that it is adequately secured and can never
be damaged by being dropped or by impacts on the equipment.
Fire hazard
• Never place naked flames near the equipment.
Humidity
• Never expose the equipment to rain or a high level of humidity. For this reason do not install it in the immediate
vicinity of swimming pools, showers, damp basement rooms or other areas with unusually high atmospheric humidity.
• Never place objects containing liquid (e.g. vases or drinking glasses) on the equipment. Liquids in the equipment
could cause a short circuit.
Connection
• The equipment must be connected to a mains socket that has an earth contact.
• Lay all connection cables so that they do not present a trip hazard.
• Check whether the connection figures comply with the existing mains supply. Serious damage could occur due to
connecting the system to the wrong power supply. An incorrect mains voltage could damage the equipment or
cause an electric shock.
• If the equipment causes a blown fuse or a short circuit, disconnect it from the mains and have it checked and repaired.
• Do not hold the mains cable with wet hands. There must be no water or dust on the contact pins. In both cases
you could receive an electric shock.
• The mains cable must be firmly connected. If it is loose there is a fire hazard.
• Always pull out the mains cable from the mains and/or from the equipment by the plug – never by the cable. The
cable could be damaged and cause an electric shock or fire.
• Do not use the equipment if the mains plug is damaged.
• If you connect defective or unsuitable accessories, the equipment could be damaged. Only use connection cables
available from or recommended by beyerdynamic. If you use cables you have made up yourself, all claim to warranty
is null and void.
The label shown on the left is attached to back of the unit. The symbols on this label
have the following meaning:
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this
unit.
This symbol indicates that there are important operating and maintenance instructions in the literature
accompanying this unit.
This symbol on the rear panel of the power supply indicates that the power supply must be mounted
in the direction shown by arrow such that its top is always on upper side.
Safety symbols
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2.2 Controls and indicators
Power on LED
Audio input, 3-pin XLR, balanced, ungrounded, adjustable via “Input Level” potentiometer
Audio output, 3-pin XLR, balanced, ungrounded
Line output, e.g. for recorders
Input level control
Connection for more power supply units / system extension
Connection for microphone units
On/Off switch
Power connection with fuse holder
MCS 20 front view
MCS 20 rear view
2.3 Operation
Power connection
• Check whether the connection figures comply with the existing mains supply. Serious damage could occur due to
connecting the system to the wrong power supply.
• Make sure the power cable cannot be damaged or severed by sharp objects.
• Connect the MCS 20 power supply unit to the mains. Make sure the mains cable is firmly connected to the
MCS 20 power connection . The fuse holder contains a 3.15 AT fuse.
Renk sockets
• The MCS 20 power supply unit provides Renk sockets to connect further MCS 20 power supply units and
microphone units . Further microphone units can be connected to the individual power supply units. Refer also
to chapter 4. “Examples of a system configuration”.
Note: Please make sure that the microphone units are connected to the appropriate connection only.
• Also please ensure that pin no. 8 of the Renk sockets is always grounded while in use, so that pin no. 3 of the
Renk socket has +24 V with reference to ground and pin no. 7 of the Renk socket has -24 V with reference to
ground.
Audio connections
• Audio input , 3-pin XLR socket, input, balanced, ungrounded; can be adjusted with the “Input Level” potentiometer.
The input signal is routed to the loudspeakers of the microphone unit and released via the audio output.
Connection:
1 = System ground (No connection to the protective earthing conductor to avoid hum!)
2 = +Signal
3 = -Signal
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• Audio output , 3-pin XLR connector, +6 dB output, balanced, ungrounded, master output of all microphones
and the signal of the audio input for recordings and audio transmission.
Connection:
1 = NC - not connected
2 = +Signal
3 = -Signal
• Line output , RCA socket, line output; master output of all microphones and audio input.
Turning on/off
• Check all connections before turning on the power supply unit. A mains voltage between 100 and 240 V is
suitable, because a change over to another voltage is not necessary. Turn on the MCS 20 systems with the power
switch .
• The green LED on the front indicates the operating status.
Important notes for power supply units
• If several power supply units are used in one system, they should be simultaneously turned on, e.g. with a
common power switch.
• To avoid an overload of the cables never connect two or more power supply units with T-adapters!
• Several MCS 20 units can be stockpiled in a rack. For a sufficient ventilation leave a space of one height unit (U) over
and under the unit. The space behind the devices must not be closed.
Important:
When you install the MCS 20 power supply unit into a rack, please make sure that the rack has been earthed
(connected to the earth wire of the electrical installation).
For rack mounting use screws of a minimum size of M 6 x 15 mm.
• The ambient temperature should not exceed 40 °C. The devices have been designed for an operation in dry
rooms only!
2.4 Cabling
• The number of the required power supply systems for one system depends upon the number of microphones
turned on simultaneously. This can probably increase the number of required power supply units. The maximum
number of simultaneously turned on delegate microphone units (max. 8) has to be considered. If the configuration
switches 1, 2 or 3 of the microphone units are switched to “OFF”, the number of microphone units to be turned
on simultaneously is increased over the limit (max. 8) and consequently the load of the power supply units.
• Connect the conference socket of the first microphone unit to the connection for microphone units of the
MCS 20 power supply unit.
• Connect the conference socket of the first microphone unit to the conference socket of the second micro-
phone unit and so on, until all microphone units are connected.
• If you use self-assembled cables, observe the cable specifications from beyerdynamic and check each cable for
short circuits, interruptions and wrong connections.
Warning: beyerdynamic assumes no liability or warranty for damages caused by cables which are not
manufactured by beyerdynamic.
• Individual cable branches must not exceed a length of 160 metres each.
Maximum cable length within one system: 1000 metres.
• The minimum supply of the last microphone unit in a chain must be ±18 V.
• When using MCS 221 microphone units up to 60 microphone units can be connected to one MCS 20 power
supply unit with a maximum cable length of 2.5 metres between each microphone unit. When using the
MCS 263 up to 45 under-table microphone units can be connected to one MCS 20 power supply unit.
Note: Please contact beyerdynamic if you plan to use larger systems or complex cable topologies.
• In larger systems distribute the microphone units evenly to the power supply units. For example if want to connect
70 microphone units to two power supply units, connect 35 microphone units to the first power supply unit and
35 microphone units to the second power supply unit.
MCS 20 – MCS 221 Microphone Unit
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3. Microphone units
3.1 Safety information
General
• The microphone units provide a gooseneck microphone. Take care that you do not injure yourself on this e.g. poke it
into your eye.
• To align the gooseneck microphone on the microphone station and to avoid twisting it too far and causing
premature wear, always grip the microphone by the bottom flexible section never by the microphone head or by
the rigid tube. The gooseneck must be bent no further than an angle of 90 ° maximum.
Volume
• If the participants of the meeting use a headphone with the microphone units, please make sure that the volume
is not set too high. Otherwise the hearing of the participants could permanently be damaged.
• When the volume is set too high, acoustic feedback (howling) can occur.
Connection
• Make sure that the connector is tightly connected to the microphone unit. If it is loose it can cause interferences.
Exemption from liability
• beyerdynamic GmbH & Co. KG will not be liable if any damage, injury or accident occurs due to negligent,
incorrect or inappropriate operation of the product.
3.2 MCS 221 delegate microphone unit – controls and indicators
Rear view
Conference socket to connect to the next microphone unit or to the power supply unit
Headphone connection, mini jack (3.5 mm)
Conference socket to connect to the next microphone unit or to the power supply unit
MCS 20 – MCS 221 Microphone Unit
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Bottom view
Top view
Configuration switches (DIP switches)
Gooseneck microphone with LED ring
Microphone button with LED
Loudspeaker
3.2.1 How to operate the MCS 221 delegate microphone unit
• For speaking, the microphone of the MCS 221 delegate microphone unit has to be activated. When the micro-
phone is activated, the LED ring of the gooseneck microphone and the LED of the microphone button will
illuminate. In the “Free” operating mode each delegate can turn on his microphone with the microphone button .
In the “Request” operating mode, the delegate has to press the microphone button to enter a request-to-speak. In
the “Request” mode the LED ring of the microphone unit will flash, before the chairman can activate the microphone of the delegate microphone unit with the “Req” button. In the “FiFo”mode a microphone unit is turned
off, when another one is turned on. A distance of approx. 30 cm between the speaker and microphone is close
enough.
• When the delegate speaks into his activated microphone, the signal is transmitted via all loudspeakers to the other
microphone units. The loudspeaker of the current speaker is automatically deactivated. Each microphone unit features a
limiter of 40 dB to avoid overrides when talking closely.
Important: If a headphone is connected to the microphone unit, it will be muted when the microphone is activated.
• The microphone of the delegate microphone unit can be turned on voice-controlled, which allows an operation
without pressing the microphone button when the speaker speaks into the microphone.
The “Voice Activation” operating mode can also be selected with the chairman microphone unit.
• The delegate microphone units are turned off, when the delegate presses his microphone button or when the
chairman presses the “Clear” button.
This is also effected with the “Req” button in the “Request” mode, when the next speaker may speak.
In the “Voice” operation the microphone is automatically turned off after a pause of two seconds.
• The admitted talk time for the current speaker can be determined and displayed with the “Timer” function.
Depending on the setting the activated microphone unit can automatically be turned off after an audio warning
for instance or the exceeded talk time is displayed. In addition to standard functions, many settings can be allocated
and changed via configuration switches and programming. This provides a varity of operating modes and operation.
MCS 20 – MCS 221 Microphone Unit
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3.2.2 Configuration switch
• At the bottom of the delegate microphone units there are configuration switches. Depending on the “ON” or
“OFF” position, the functions listed in the table below are allocated. For programming functions of the MCS 223
chairman microphone unit, please refer to chapter 3.3.8 “Programming mode” and 3.3.9 “Table of programmable
functions”.
ON OFF
1* Microphone unit is counted to the limit Microphone unit is not counted to the limit
2* Microphone unit is counted to the limit in the
“VOICE” operation
Microphone unit is not counted to the limit in the
“VOICE” operation
3* Limit refers to microphone unit Limit does not refer to microphone unit
4* “VOICE” operation allowed “VOICE” operation not allowed
5* Microphone unit cannot be cleared; can be turned
on in all operating modes - observe switch 3
Microphone unit can be cleared
6 without function without function
7 without function without function
8 Microphone button enabled in “VOICE” operation Microphone button disabled in “VOICE” operation
*When this switch is set to “OFF”, the maximum number of simultaneously open delegate microphone units is more
than 8. This results is an increased power consumption.
Example of the configuration switches of a MCS 221 delegate microphone unit, which has been configured
to a “sub-chairman”.
1 OFF – Microphone unit is not counted to the limit
Switch 1 of this microphone unit is set to “OFF”: the microphone of this microphone unit and three other
MCS 221 microphone units (= 4 microphone units) are activated. The limit of the MCS 223 chairman microphone unit is set to 4. Another speaker can turn on his microphone even though, because the microphone
unit, whose switch is set to “OFF”, is not counted to the limit.
This function for example can be selected for a microphone unit to make announcements. This microphone
unit should not block the activation of the delegate microphone units.
MCS 20 – MCS 221 Microphone Unit
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2 OFF – Microphone unit is not counted to the limit in the “VOICE” operation
This switch refers only to the MCS 221 delegate microphone unit.
3 OFF – Limit does not refer to this microphone unit
The speaker can also turn on his microphone unit or enter a request-to-speak, when the limit is already
achieved.
4 OFF – VOICE operation not allowed
When this switch is set to “OFF”, the voice-controlled activation is not possible (whether this operation
mode has been selected by the chairman). It can be activated with the microphone button, when switch 8
or 5 is set to “ON”.
5 ON – Microphone unit cannot be cleared - can be turned on in all operating modes - observe switch 3
The microphone unit can be turned on in all operating modes, but not when the limit is already achieved.
As switch 3 is set to “OFF” in this example, the speaker can turn on his microphone unit when the limit is
achieved.
6 – without function
7 – without function
8 ON – Microphone button active in the voice-controlled operation mode
When switch 8 is set to “ON”, this microphone unit can be activated via the microphone button in the
voice-controlled operation mode.
When the switches 8 and 5 are set to “OFF”, the microphone unit can only be activated voice-controlled.
Note: When switch 5 is set to “ON”, the function of switch 8 is also activated. This microphone unit can also be
activated with the microphone button in the voice-controlled mode when switch 8 is set to “OFF”.
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