Sonifex CM-CU21 Instruction Manual

CM-CU21 Commentator Unit
User Handbook

bCM-CU21 Commentator Unit User Handbook
©Sonifex Ltd, 2010
All Rights Reserved
Revision 1.02, August 2010
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected].uk
Website: http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a commitment on the part of
the vendor. Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any
error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying, recording, information storage and retrieval systems, for any purpose other than the purchaser’s
personal use, without the express written permission of Sonifex Ltd. Unless otherwise noted, all names of companies,
products and persons contained herein are part of a completely ctitious adaptation and are designed solely to
document the use of Sonifex product.
CM-CU21 COMMENTATOR UNIT
CM-CU21 COMMENTATOR UNIT HANDBOOK

CM-CU21 Commentator Unit User Handbook c
CONTENTS
CONTENTS
Warranty i
Warranty and Liability i
Unpacking the Commentator Unit iii
Returning the Warranty Card iii
Safety Information iv
Safety of Mains Operated Equipment iv
Voltage Setting Checks iv
Fuse Rating iv
Power Cable and Connection iv
Ordering the Correct Mains Lead v
Installation Information v
Atmosphere v
Electromagnetic Radiation v
WEEE & RoHS Directives - Sonifex Statement vi
1 CM-CU21 Commentator Unit 1
Introduction 1
2 Main Panel Controls & Indicators 3
On Air Buttons 3
Talkback Buttons 3
Headphone Monitor Controls 4
Commentator 3 Line Input Level Control 4
PPM Meter Display 4
Limit LED 5
Power LED 5
3 Front Panel Controls & Connections 6
Phantom Power Select Switches 6
Microphone Input Gain Controls 6
Headphone Outputs 6
Microphone/Line Inputs 6
4 Rear Panel Controls & Connections 7
On Air Lock Controls 7
Talkback Gang Switch 7
Limiter Controls 7
Test Tone Switch 7
Return Audio Inputs 8
Audio Outputs 8
DC Supply Input 8
GPIO Port 8
Mains Power 9
5 Conguration Options 10
Conguration option settings for page 1 10
Conguration option settings for page 2 11
Conguration option settings for page 3 12
Conguration option settings for page 4 12
Conguration option settings for page 5 13
Conguration option settings for page 6 13
Conguration options for page 7 14
6 Technical Specication For CM-CU21 Commentator Unit 16

dCM-CU21 Commentator Unit User Handbook
FIGURES
FIGURES
Figures
Fig A: Packing List iii
Fig B: Power Connections iv
Fig C: Mains Lead Table v
Fig 1-1: CM-CU21 Commentator Unit 1
Fig 1-2: CM-CU21 Commentator Unit Block Diagram 2
Fig 2-1: Top Panel View Of CM-CU21 3
Fig 3-1: Front Panel View Of CM-CU21 6
Fig 3-2: Rear Panel View Of CM-CU21 7

CM-CU21 Commentator Unit User Handbook i
Warranty
Warranty and Liability
Important: the purchaser is advised to read this clause
(a) The Company agrees to repair or (at its discretion) replace Goods which are found to
be defective (fair wear and tear excepted) and which are returned to the Company
within 12 months of the date of despatch provided that each of the following
are satised:
(i) notication of any defect is given to the Company immediately upon its
becoming apparent to the Purchaser;
(ii) the Goods have only been operated under normal operating conditions and
have only been subject to normal use (and in particular the Goods must have
been correctly connected and must not have been subject to high voltage or
to ionising radiation and must not have been used contrary to the Company’s
technical recommendations);
(iii) the Goods are returned to the Company’s premises at the Purchaser’s expense;
(iv) any Goods or parts of Goods replaced shall become the property of
the Company;
(v) no work whatsoever (other than normal and proper maintenance) has been
carried out to the Goods or any part of the Goods without the Company’s prior
written consent;
(vi) the defect has not arisen from a design made, furnished or specied by
the Purchaser;
(vii) the Goods have been assembled or incorporated into other goods only in
accordance with any instructions issued by the Company;
(viii) the defect has not arisen from a design modied by the Purchaser;
(ix) the defect has not arisen from an item manufactured by a person other than
the Company.
In respect of any item manufactured by a person other than the Company, the Purchaser
shall only be entitled to the benet of any warranty or guarantee provided by such
manufacturer to the Company.
(b) In respect of computer software supplied by the Company the Company does not
warrant that the use of the software will be uninterrupted or error free.
(c) The Company accepts liability:
(i) for death or personal injury to the extent that it results from the negligence of
the Company, its employees (whilst in the course of their employment) or its
agents (in the course of the agency);
WARRANTY
WARRANTY

ii CM-CU21 Commentator Unit User Handbook
(ii) for any breach by the Company of any statutory undertaking as to title, quiet
possession and freedom from encumbrance.
(d) Subject to conditions (a) and (c) from the time of despatch of the Goods from the
Company’s premises the Purchaser shall be responsible for any defect in the Goods
or loss, damage, nuisance or interference whatsoever consequential economic or
otherwise or wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of prots or other economic
losses. The Company accordingly excludes all liability for the same.
(e) At the request and expense of the Purchaser the Company will test the Goods to
ascertain performance levels and provide a report of the results of that test. The
report will be accurate at the time of the test, to the best of the belief and knowledge
of the Company, and the Company accepts no liability in respect of its accuracy
beyond that set out in Condition (a).
(f) Subject to Condition (e) no representation, condition, warranty or other term,
express or implied (by statute or otherwise) is given by the Company that the Goods
are of any particular quality or standard or will enable the Purchaser to attain any
particular performance or result, or will be suitable for any particular purpose or use
under specic conditions or will provide any particular capacity, notwithstanding
that the requirement for such performance, result or capacity or that such particular
purpose or conditions may have been known (or ought to have been known) to the
Company, its employees or agents.
(g) (i) To the extent that the Company is held legally liable to the Purchaser for any
single breach of contract, tort, representation or other act or default, the
Company’s liability for the same shall not exceed the Price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to any liability
accepted by the Seller in Condition (c).
(h) Where the Goods are sold under a consumer transaction (as dened by the
Consumer Transactions (Restrictions on Statements) Order 1976) the statutory
rights of the Purchaser are not aected by these Conditions of Sale.
WARRANTY
WARRANTY

CM-CU21 Commentator Unit User Handbook iii
Unpacking the Commentator Unit
The Commentator Unit is shipped with the following equipment. Please check your
packaging to ensure that you have all of the items below. If anything is missing, please
contact the supplier of your equipment immediately.
Item Quantity Commentator Unit
Commentator Unit 1
IEC mains lead tted with moulded mains plug 1
Handbook and warranty card 1
Fig A: Packing List
Each Commentator Unit is shipped in protective packaging and should be inspected for
damage before use. Where an item is found to have transit damage, notify the carrier
immediately with all the relevant details of the shipment. Packing materials should be kept
for inspection and also for if the product needs to be returned.
Returning the Warranty Card
In order to register the date of purchase so that we can keep you informed of any design
improvements or modications, it is important to complete the warranty registration
document that is enclosed and return it to Sonifex Ltd in the UK.
For your own records you should write down the serial number (which can be found on the
rear of the Commentator Unit).
Serial Number ………………………………………
WARRANTY
WARRANTY

iv CM-CU21 Commentator Unit User Handbook
Safety Information
Safety of Mains Operated Equipment
This equipment has been designed to meet the safety regulations currently
advised in the country of purchase and it conforms to the safety regulations
specied by use of the CE Mark.
Warning : There are no user serviceable parts inside the equipment. If you should ever
need to look inside the unit, always disconnect the mains supply before removing the
equipment covers.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power supply by
checking the box in which your Commentator Unit was supplied. The voltage is shown on
the box label. Please note that all Commentator Units have a universal power supply.
Fuse Rating
The Commentator Unit is supplied with a single fuse in the live conducting path of the
mains power input. For reasons of safety it is important that the correct rating and type of
fuse is used. Incorrectly rated fuses could present a possible re hazard, under equipment
fault conditions. The fuse rating for the Commentator Unit is:
Universal 85-264V operation - 1A 5x20mm SB
The active fuse is tted on the outside rear panel of the unit.
Power Cable and Connection
An IEC power connector is supplied with the Commentator Unit which has a moulded
plug attached – this is a legal requirement. If no moulded plug has been supplied with
your Commentator Unit, please contact your supplier, because an IEC connector is always
supplied from the Sonifex factory.
If for any reason, you need to use the Commentator Unit with a dierent power cable, you
should use the following wiring guidelines.
Wire Colour Connection
Green, or green and yellow Earth (E)
Blue, or black Neutral (N)
Brown, or red Live (L)
Fig B: Power Connections
Connect the equipment in accordance with the connection details and before applying
power to the unit, check that the machine has the correct operating voltage for your mains
power supply.
Important Note : The terminal marked on the rear panel must be earthed.
SAFETY INFORMATION
SAFETY INFORMATION

CM-CU21 Commentator Unit User Handbook v
Ordering the Correct Mains Lead
When ordering a Commentator Unit from Sonifex, it is helpful if you can specify your
required operating voltage and mains lead. After the product code add:
UK, for 230V, UK 3 pin to IEC lead
EC, for 230V, European Schuko 2 pin to IEC lead
US, for 115V, 3 pin to IEC lead
AU for 230V, Australasian 3 pin to IEC lead
Fig C: Mains Lead Table
E.g. order CM-CU21 UK for a UK IEC lead to be supplied.
Installation Information
Atmosphere
The units should be installed in an area that is not subject to excessive temperature
variation (<0°C, >50°C), moisture, dust or vibration.
Electromagnetic Radiation
The cover is connected to earth by means of the xing screws. It is essential to maintain
this earth ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
SAFETY INFORMATION
SAFETY INFORMATION

vi CM-CU21 Commentator Unit User Handbook
WEEE & RoHS Directives - Sonifex Statement
The Waste Electrical and Electronic Equipment (WEEE) Directive was agreed on
13 February 2003, along with the related Directive 2002/95/EC on Restrictions
of the use of certain Hazardous Substances in electrical and electronic
equipment (RoHS).
The Waste Electrical and Electronic Equipment Directive (WEEE) aims to minimise the
impacts of electrical and electronic equipment on the environment during their life times
and when they become waste. It applies to a huge spectrum of products. It encourages
and sets criteria for the collection, treatment, recycling and recovery of waste electrical and
electronic equipment. All products manufactured by Sonifex Ltd have the WEEE directive
label placed on the case. It gives a contact for individuals who are unsure about the correct
procedure when the product has reached its “end of use”.
Sonifex Ltd will be happy to give you information about local organisations that can
reprocess the products, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Sonifex Ltd has phased out the use of certain hazardous substances identied in the
European Union’s Restriction of Hazardous Substances (RoHS) directive. The RoHS
directive limits the use of certain hazardous substances currently used in EEE manufacture,
including lead, mercury, cadmium, hexavalent chromium, and halide-containing
compounds PBB (polybrominated biphenyl) and PBDE (polybrominated diphenyl ether).
Elimination of these substances will result in more environmentally friendly recycling
of electronic equipment. For the products which Sonifex manufacture, the main area
where products were aected was in the use of lead for manufacturing and assembling
electronics circuit boards.
Sonifex Ltd practices lead-free (LF) manufacturing processes. LF solder is used on the
surface-mount PCB manufacturing processes and for hand soldering. The printed circuit
boards (PCBs) used are either gold plated, or immersion tin plated, both of which use no
lead. Historically the PCBs were hot air solder levelled (HASL) PCBs which used tin/lead
based solder.
The manufacturing processes include the assembly of purchased components from
various sources. Product is oered as RoHS compliant, or LF, only after sucient evidence
is received from the component manufacturers that their components are RoHS compliant.
Sonifex Ltd relies solely on the distributor, or manufacturer, of the components for
identication of RoHS compliance. Thus whilst every eort is made to ensure compliance,
Sonifex Ltd makes no warranty, or certication, or declaration of compliance concerning
said components.
Sonifex Ltd denes“Lead Free”as pertaining to any product, which has been manufactured
by Sonifex Ltd using components which have been declared by the manufacturers as
“Lead Free”. All statements by Sonifex Ltd of RoHS compliance are based on component
manufacturer documentation.
WEEE & ROHS DIRECTIVE
WEEE & ROHS DIRECTIVE

CM-CU21 Commentator Unit User Handbook
1
INTRODUCTION
CM-CU21 COMMENTATOR UNIT 1
1 CM-CU21 Commentator Unit
Introduction
Fig 1-1: CM-CU21 Commentator Unit
The CM-CU21 Commentator Unit is a high quality, portable broadcast mixer and 4-wire
talkback unit. Its sturdy construction and exibility of features make it suitable for use in a
wide variety of environments.
It provides two fully featured commentator positions and a third guest position that can
alternatively be used as a line-level input, allowing program idents/eects to be mixed
with the commentator inputs. Each position has an individual output, with two additional
outputs providing a mix of all active commentary channels. A limit indicator on the main
panel shows when the adjustable limiter on the mix outputs is active, and a bright 21
segment LED PPM meter, which can be disabled, shows the main output level.
Two talkback output channels, with a built in limiter, are available to each of the two main
commentators. They have adjustable gain and can be linked to provide simultaneous
operation.
A wide input gain range and switchable phantom power on each commentary position
provides supports for a variety of microphone types, from high output phantom units to
low output ribbon microphones.
There are 4 transformer balanced return audio inputs which, along with the commentator
inputs, are routed to the headphone monitor controls. With these headphone controls, any
input can be level adjusted, and sent to either the left, right or both ears.

2CM-CU21 Commentator Unit User Handbook
CM-CU21 COMMENTATOR UNIT
INTRODUCTION
1
A GPIO port gives an open-collector driven output indication of any active on-air or
talkback channels, and four remote inputs provide an external call/alert to each of the
talkback controls.
The Commentator Unit has a built in line-up tone generator for easy channel identication
and cabling checks, and a exible range of options allow the unit to be customised to
better suit the operational and users’ personal requirements.
Fig 1-2: CM-CU21 Commentator Unit Block Diagram

CM-CU21 Commentator Unit User Handbook 3
CM-CU21 COMMENTATOR UNIT
MAIN PANEL CONTROLS & INDICATORS
2
2 Main Panel Controls & Indicators
Fig 2-1: Top Panel View Of CM-CU21
The main or top panel of the Commentator Unit is split into four areas. To the left and
right are the main commentator position controls, with the third commentator/guest
position controls located in the centre, below the power indicator, mix output limiter active
indicator and the PPM meter display.
On Air Buttons
The On Air buttons route the commentator microphone input signal to the corresponding
Comm output and to both of the Mix Outputs, where it is mixed with all other active
commentator signals. These buttons have a latching action; press to activate and press
again to deactivate. When an On Air control is active, the button illuminates red and the
corresponding open collector driver output on the GPIO port is activated.
Talkback Buttons
The Talkback A and B buttons allow either of the two main commentators’microphone
signals to be redirected to the corresponding Talkback output. The associated Comm
output is muted and the commentators’ signal is removed from the Mix Outputs. The four

4CM-CU21 Commentator Unit User Handbook
CM-CU21 COMMENTATOR UNIT
2
MAIN PANEL CONTROLS & INDICATORS
return audio inputs Prog, A, B and C function normally when a Talkback channel is active,
allowing full-duplex communication between the commentator and a third party. These
buttons have a momentary action by default; press to activate, release to deactivate. See
section 5 Conguration Options on page 10 for details of how to change the button action.
When a Talkback control is active, the button illuminates green and the corresponding
open collector driver output on the GPIO port is activated.
Headphone Monitor Controls
The two main commentator positions have six sets of headphones controls which allow
them to monitor all of units’ return audio and active commentator inputs. Each available
input has an associated level adjustment potentiometer and a headphone channel selector
switch. Each potentiometer provides a level adjustment from “full o” to “full on”, and the
headphone channel selector determines which ear the associated signal is routed to; either
the left, the right or to both ears when the switch is in the centre position. By default, the
commentator input signals are only routed to the headphone monitor controls when the
corresponding On Air control is active. It is possible to route each of these signals to the
headphones permanently, regardless of the state of the corresponding On Air control.
See section 5 Conguration Options on page 10 for details.
The guest position, commentator 3, can be set to accept a line level input, and an
additional option can be congured to prevent this signal from being routed to the
commentator 1 and 2 headphone monitors.
The headphone controls for the third commentator position consist of left and right level
adjustment potentiometers, and a switch to select the routing for the commentator input
signals. With the switch in the left position, commentator 1 is heard in the left ear and
commentator 3 is heard in the right ear. With the switch in the right position, commentator
2 is heard in the right ear and commentator 3 is heard in the left ear. When the switch is in
the centre position, commentator 1 is heard in the left ear, commentator 2 is heard in the
right ear and commentator 3s’ own signal is heard in both ears.
Commentator 3 Line Input Level Control
When the third commentator input is set to accept a line input, this potentiometer sets
the gain applied to the signal prior to being routed to the headphone monitor and main
output channels. The gain range is -83dB to +10dB with a maximum input level of +25dBu.
PPM Meter Display
The 21 segment LED PPM meter display indicates the level of the signal on the mix outputs.
The PPM scale conforms to IEC60268-10 11a and a dB scale is also shown. There are options
to set the brightness level of the PPM meter, or it can be disabled if it is not required. See
section 5 Conguration Options on page 10 for details.

CM-CU21 Commentator Unit User Handbook 5
CM-CU21 COMMENTATOR UNIT
2
MAIN PANEL CONTROLS & INDICATORS
Limit LED
The limit LED illuminates when the adjustable limiter on the mix outputs is enabled and
active. See section 4 Rear Panel Controls on page 7 for details of how to enable and adjust
the limiter. The colour and brightness level of the limit LED can be changed if required, see
section 5 Conguration Options on page 10 for details.
Power LED
The power LED indicates that the unit has power from either of its mains or DC inputs
when it illuminates red. If this indicator is not on when mains power is connected to the
unit, this may indicate a ruptured mains fuse or a problem with the internal power
supply module. The power LED also indicates when the unit is in setup mode by ashing
amber/red.

6CM-CU21 Commentator Unit User Handbook
CM-CU21 COMMENTATOR UNIT
FRONT PANEL CONTROLS & CONNECTIONS
3
3 Front Panel Controls & Connections
Fig 3-1: Front Panel View Of CM-CU21
The front panel of the Commentator Unit has all of the commentator inputs and
headphone outputs as well as the microphone power and gain controls.
Phantom Power Select Switches
Each of the three commentator inputs support phantom powered microphones. The two
main commentator positions have dedicated phantom power switches that enable the 48V
supply. The third commentator position has a three way switch that sets the input type.
When the switch is in the bottom position, the input is a line level input. With the switch
in the centre position, the input is for microphones not requiring phantom power. The top
switch position enables the microphone input phantom power.
Microphone Input Gain Controls
Each of the commentator microphone inputs has an individually adjustable gain setting.
The total gain range of +20dB to +86dB is split into two, to provide greater accuracy of
adjustment. The mic gain switch sets the base gain value of either +20dB or +50dB for the
corresponding input. The associated mic gain potentiometer can then be adjusted to add
up to 36dB of additional gain.
Headphone Outputs
The front panel mounted headphone outputs are via ¼” stereo jack sockets. The two main
commentator positions have locking sockets to prevent the headphone plug from being
accidentally pulled out.
Microphone/Line Inputs
The microphone inputs for the two main commentators and the microphone/line level
input for the third position are via 3 pin female XLR-3 connectors with the following
connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase

CM-CU21 Commentator Unit User Handbook 7
CM-CU21 COMMENTATOR UNIT
REAR PANEL CONTROLS & CONNECTIONS
4
4 Rear Panel Controls & Connections
Fig 3-2: Rear Panel View Of CM-CU21
The rear panel of the Commentator Unit carries the four return audio inputs and all comm.,
talkback and mix output connectors. Four additional controls are located on the rear panel;
On Air Lock, Talkback Gang, Limiter and Test Tone.
On Air Lock Controls
The on air lock prevents any of the commentators on air buttons from being deactivated
accidentally. When the on air lock is enabled, an on air channel can only be deactivated by
rst pressing the pushbutton located next to the on air lock switch. A slot in the rear panel
makes locating the on air lock pushbutton easy; simply position your nger in the slot in
the rear panel, indicated by the “ON AIR LOCK” text on the top panel, then slide your nger
down the slot until you reach the pushbutton.
Talkback Gang Switch
The talkback gang switch links the operation of each of the main commentators’talkback
A and B buttons. When this switch is on, pressing one of the talkback buttons will
automatically activate the commentators’other talkback button.
Limiter Controls
The limiter enable switch and level potentiometer control the limiter that is applied to the
main mix outputs. The potentiometer sets the threshold level at which the limiter becomes
active, and has a range of between -13dB to the maximum output level of +25dB.
Test Tone Switch
The Commentator Unit has a built in Test Tone generator which selectively routes a line-up
tone to all outputs to assist channel identication and cabling checks. There are two test
tone modes; manual and auto. Regardless of mode, a 1 kHz tone is permanently routed to
the mix outputs and the PPM meter will indicate that the signal level is 0dBu. The test tone
is enabled by sliding the switch to the upper “ON” position. To change the test tone mode;
keep the Commentator 1 and Commentator 2 On Air buttons pressed for 2.5 seconds.
With the test tone in manual mode, all On Air and Talkback buttons will ash amber. The
test tone can be routed to the Comm and Talkback outputs by pressing the corresponding

8CM-CU21 Commentator Unit User Handbook
CM-CU21 COMMENTATOR UNIT
4
REAR PANEL CONTROLS & CONNECTIONS
On Air or Talkback buttons. The On Air buttons will illuminate red when pressed and the
Talkback buttons will illuminate green. When the button is released, the tone on that
output will be muted.
With the test tone in auto mode, each of the Comm and Talkback outputs are automatically
identied by a unique number of short tone bursts, lasting 0.25 seconds each, which
are repeated every 3 seconds. Each button ashes when tone is being routed to the
corresponding output. The number of pulses on each output is shown below:
Comm 1 1 pulse
Comm 2 2 pulses
Comm 3 3 pulses
Talkback A 4 pulses
Talkback B 5 pulses
The 4 return audio inputs function normally when the test tone is enabled. This could
be useful in allowing the user to receive instructions on which channel to output tone
to when using the test tone in manual mode. When the test tone is disabled, normal
operating mode is resumed and the On Air and Talkback buttons will be returned to the
state they were in prior to entering test tone mode.
Return Audio Inputs
The four transformer balanced return audio inputs, Prog, A, B and C are via 3 pin female
XLR-3 connectors with the following connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase
Audio Outputs
The three electronically balanced commentator outputs Comm1-3, and the transformer
balanced talkback A and B and mix outputs are all via 3 pin male XLR-3 connectors with the
following connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase
DC Supply Input
The commentator unit can be powered from an external, regulated 12V or 24V DC power
source. The DC input is via a 4 pin male XLR-4 connector with the following connections:
Pin 1: 0V
Pin 2: No connection
Pin 3: No connection
Pin 4: +VE (12-24 Volt DC)

CM-CU21 Commentator Unit User Handbook 9
CM-CU21 COMMENTATOR UNIT
4
REAR PANEL CONTROLS & CONNECTIONS
When powering the Commentator Unit via the DC supply input, it is important to ensure
the unit is suitably earthed. An earth connection point is provided on the rear panel in the
form of a M4 stud and screw and this should be connected directly to a technical earth.
GPIO Port
The Commentator Units’ GPIO port has 7 open-collector driven outputs and 4 active low
inputs. The 7 open-collector outputs, which are low (conducting) when active, indicate
which of the On Air or Talkback channels are active.
Each of the 4 active low inputs drives a call/alert signal on the corresponding Talkback
button. When an input is active, the associated Talkback button will ash amber.
The GPIO port connector is a 15-way female D-type with the following pin assignments:
Pin Number I/O Function
1 O Commentator 1 ON AIR active – open collector output
2 O Commentator 1 TALKBACK A active – open collector output
3 O Commentator 1 TALKBACK B active – open collector output
4 O Commentator 2 ON AIR active – open collector output
5 O Commentator 2 TALKBACK A active – open collector output
6 O Commentator 2 TALKBACK B active – open collector output
7 O Commentator 3 ON AIR active – open collector output
8 - no connection
9 - Digital ground (0V)
10 I Commentator 1 TALKBACK A call/alert – active low input
11 I Commentator 1 TALKBACK B call/alert – active low input
12 - Digital ground (0V)
13 I Commentator 2 TALKBACK A call/alert – active low input
14 I Commentator 2 TALKBACK B call/alert – active low input
15 - Digital ground (0V)
Mains Power
Mains power is applied via a standard three-pin IEC male socket. Mains voltages between
85V and 264V AC at frequencies between 47 and 63Hz are accepted without adjustment.
A 1A, 5 x 20mm SB fuse is used. The Earth pin MUST be connected to ensure safety.

10 CM-CU21 Commentator Unit User Handbook
CM-CU21 COMMENTATOR UNIT
CONFIGURATION OPTIONS
5
5 Conguration Options
The Commentator Unit has several user congurable options that can be changed to suit
specic operational or personal requirements. These options can only be changed by
entering a setup mode, which is accessible when the unit is powered-up.
To enter setup mode: apply power to the unit whilst keeping the Commentator 1 and
Commentator 2 On Air buttons pressed for 5 seconds. The power indicator LED will
ash red and amber to indicate setup mode has been entered. The Commentator 1 and
Commentator 2 On Air buttons can now be released.
The conguration options are arranged in 7 pages, with up to 7 options in each page. The
current page number is indicated on the PPM display by a single illuminated segment.
Please note, when page 6 is selected, all the segments in the PPM display are enabled to
indicate the current PPM illumination level setting. Each option within the selected page is
associated with one of the 7 main control buttons on the top panel of the unit. Each button
ashes in a recurring sequence to indicate the current mode setting of the associated
option. One ash equals mode 1, two ashes equals mode 2 etc. Buttons that do not have
an associated option in the current page do not ash.
To change the current page: press and hold the Commentator 3 On Air button for at least
1 second. The PPM display will change to indicate the new page.
To change the option mode setting: press the appropriate button once. The number of
ashes will increase to indicate the new mode setting. Once the maximum option mode
setting has been reached, the value will wrap around to mode 1.
The conguration option settings for each page are listed below. The factory default
settings for each option are shown in brackets:
Conguration option settings for page 1
Commentator 1 ON AIR button:
Mode 1 Commentator 1 ON AIR is permanently disabled and cannot be selected.
Mode 2 Commentator 1 ON AIR can be selected as normal (default).
Mode 3 Commentator 1 ON AIR is permanently selected and cannot be disabled.
Commentator 1 TALKBACK A button:
Mode 1 Commentator 1 TALKBACK A button momentary mode enabled (default).
Mode 2 Commentator 1 TALKBACK A button latching mode enabled.
Mode 3 Commentator 1 TALKBACK A button momentary and latching modes enabled.
Commentator 1 TALKBACK B button:
Mode 1 Commentator 1 TALKBACK B button momentary mode enabled (default).
Mode 2 Commentator 1 TALKBACK B button latching mode enabled.
Mode 3 Commentator 1 TALKBACK B button momentary and latching modes enabled.