Sonifex CM-CU1 Instruction Manual

CM-CU1 Commentator Unit
User Handbook

bCM-CU1 Commentator Unit User Handbook
©Sonifex Ltd, 2012
All Rights Reserved
Revision 1.00, June 2012
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 fictitious adaptation and are designed solely to
document the use of Sonifex product.
CM-CU1 COMMENTATOR UNIT
CM-CU1 COMMENTATOR UNIT HANDBOOK

CM-CU1 Commentator Unit User Handbook c
CONTENTS
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-CU1 Commentator Unit 1
Introduction 1
2 Main Panel Controls & Indicators 3
ON AIR Button 3
TALKBACK Buttons 3
Headphone Monitor Controls 4
PPM Meter Display 4
Limit LED 4
Power LED 4
3 Front Panel Controls & Connections 5
Phantom Power Select Switch 5
Microphone Input Gain Controls 5
Headphone Output 5
Microphone Input 5
Line Input 5
4 Rear Panel Controls & Connections 6
On Air Lock Controls 6
Talkback Controls 6
Limiter Controls 6
Test Tone Switch 6
Return Audio Inputs 7
Audio Outputs 7
DC Supply Input 7
GPIO Port 8
Mains Power 8
5 Configuration Options 9
Entering Setup Mode 9
Config Page 1 - ON AIR Button Enable/Disable & TALKBACK Button Latching Modes 9
Config Page 2 - Line Input Routing to Output 10
Config Page 3 - Commentator Mic & Line Input Routing to Headphones 10
Config Page 4 - No Function 10
Config Page 5 - Limit LED Colour & Limit/Power LED Brightness 11
Config Page 6 - ON AIR/TALKBACK Button & PPM Brightness 11
Config Page 7 - Save/Load Configurations & Firmware Version 12
6 Technical Specification For CM-CU1 Commentator Unit 13

dCM-CU1 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-CU1 Commentator Unit 1
Fig 2-1: Top Panel View Of CM-CU1 3
Fig 3-1: Front Panel View Of CM-CU1 5
Fig 3-2: Rear Panel View Of CM-CU1 6

CM-CU1 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 satisfied:
(i) notification 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 specified 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 modified 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 benefit 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-CU1 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 profits 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 specific 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 defined by the
Consumer Transactions (Restrictions on Statements) Order 1976) the statutory
rights of the Purchaser are not affected by these Conditions of Sale.
WARRANTY
WARRANTY

CM-CU1 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 fitted 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 modifications, it is important to complete the warranty registration
document that is enclosed and return it to Sonifex Ltd in the UK, or register online at
www.sonifex.co.uk/register
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-CU1 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
specified 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 fire hazard, under equipment
fault conditions. The fuse rating for the Commentator Unit is:
Universal 85-264V operation - 1A 5x20mm SB
The active fuse is fitted 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 different 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-CU1 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-CU1 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 fixing 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-CU1 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 identified 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 affected 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 offered as RoHS compliant, or LF, only after sufficient 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
identification of RoHS compliance. Thus whilst every effort is made to ensure compliance,
Sonifex Ltd makes no warranty, or certification, or declaration of compliance concerning
said components.
Sonifex Ltd defines “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-CU1 Commentator Unit User Handbook 1
INTRODUCTION
1
INTRODUCTION
1 CM-CU1 Commentator Unit
Introduction
Fig 1-1: CM-CU1 Commentator Unit
The CM-CU1 Commentator Unit is a high quality, portable broadcast mixer and 4-wire
talkback unit. Its sturdy construction and flexibility of features make it suitable for use in a
wide variety of environments.
It provides a fully featured commentator position with both limited, transformer balanced,
and non-limited, electronically balanced outputs. A limit indicator on the main panel
shows when the adjustable limiter on the mix output is active, and a bright 21 segment
LED PPM meter, which can be disabled, shows the main output level.
The line input can be configured to remain present at the mix output even if the
commentator is off air, making it useful for routing crowd effects or pre-recorded
material to the programme feed. Its presence in the commentator’s headphones is also
configurable to suit the application.
Four talkback output channels, with a built in limiter, are available to the commentator.
They have adjustable gain and can be linked to provide simultaneous operation.
A wide input gain range and switchable phantom power provides support for a variety of
microphone types, from high output phantom units to low output ribbon microphones.
There are 5 transformer balanced return audio inputs which, along with the commentator
input, 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-CU1 Commentator Unit User Handbook
INTRODUCTION
1INTRODUCTION
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 identification
and cabling checks, and a flexible range of options allow the unit to be customised to
better suit the operational and users’personal requirements.
Fig 1-2: CM-CU1 Commentator Unit Block Diagram

CM-CU1 Commentator Unit User Handbook 3
MAIN CONTROLS & INDICATORS
MAIN CONTROLS & INDICATORS 2
2 Main Panel Controls & Indicators
Fig 2-1: Top Panel View Of CM-CU1
The main panel of the Commentator Unit is split into two areas. At the top are the mix
output PPM meter display, mix output limiter active indicator and the power indicator LED.
Below this are the main commentator position controls, with the TALKBACK and ON AIR
buttons located towards the bottom.
ON AIR Button
The ON AIR button routes the commentator microphone input signal to the Comm Output
and to the Mix Output. This button has a latching action; press to activate and press
again to deactivate. When the On Air control is active, the button illuminates red and the
corresponding open collector driver output on the GPIO port is activated.
The line input signal is permanently routed to the mix output by default. It is possible to
configure the line input signal to be routed only when the ON AIR button is active. See
Page 10 ‘Config Page 2 - Line Input Routing to Output’ for details.
TALKBACK Buttons
The TALKBACK A, B, C and D buttons allow the commentator’s microphone signal to be
redirected to the corresponding Talkback Output. The commentator output is muted and
the commentator’s signal is removed from the Mix Output. The five return audio inputs

4CM-CU1 Commentator Unit User Handbook
MAIN CONTROLS & INDICATORS
MAIN CONTROLS & INDICATORS
2
Prog, A, B, C and D 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 Page 9‘Config
Page 1 - ON AIR Button Enable/Disable & TALKBACK Button Latching Modes’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 commentator position has a set of six headphone controls which allows it to monitor
all of the units’return audio and the commentator and line inputs, if active. Each available
input has an associated level adjustment potentiometer and a headphone channel selector
switch. Each potentiometer provides a level adjustment from “full off” 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 signal is only routed to the headphone monitor controls when the
On Air control is active. It is possible to route this signal to the headphones permanently,
regardless of the state of the On Air control line input. See Page 10 ‘Config Page 3 -
Commentator Mic & Line Input Routing to Headphones’for details.
It is also possible to configure the presence of the line input signal in the headphones
using Config Page 3 too. By default, the line input signal is permanently routed to the
headphone monitor controls.
PPM Meter Display
The 21 segment LED PPM meter display indicates the level of the signal on the Mix Output.
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
Page 11 ‘Config Page 5 - Limit LED Colour & Limit/Power LED Brightness’ for details.
Limit LED
The limit LED illuminates when the adjustable limiter on the Mix Output is enabled and
active. See Page 6 for information on the Limiter controls. The colour and brightness level
of the limit LED can be changed if required. See Page 11‘Config Page 5 - Limit LED Colour &
Limit/Power LED Brightness’ for details.
Power LED
The power LED illuminates red to indicate that the unit has power from either of its mains
or DC inputs. 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 flashing amber/red.

CM-CU1 Commentator Unit User Handbook 5
FRONT PANEL CONTROLS & CONNECTIONS
FRONT PANEL CONTROLS & CONNECTIONS 3
3 Front Panel Controls & Connections
Fig 3-1: Front Panel View Of CM-CU1
The front panel of the Commentator Unit has the commentator input and headphone
output as well as the microphone power and gain controls.
Phantom Power Select Switch
The commentator input supports phantom powered microphones. The commentator
position has a dedicated phantom power switch that enables the 48V supply.
Microphone Input Gain Controls
The commentator microphone input has an 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 input. The mic gain
potentiometer can then be adjusted to add up to 36dB of additional gain.
Headphone Output
The front panel mounted headphone output is via a ¼”stereo jack socket, which is locking
to prevent the headphone plug from being accidentally pulled out.
Microphone Input
The microphone input is via a 3 pin female XLR-3 connector with the following
connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase
Line Input
The line input is via a 3 pin female XLR-3 connector with the following connections:
Pin 1: Ground
Pin 2: Phase
Pin 3: Non-phase

6CM-CU1 Commentator Unit User Handbook
REAR PANEL CONTROLS & CONNECTIONS
REAR PANEL CONTROLS & CONNECTIONS
4
4 Rear Panel Controls & Connections
Fig 3-2: Rear Panel View Of CM-CU1
The rear panel of the Commentator Unit carries the five return audio inputs and
commentator, 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 the commentator’s ON AIR button from being deactivated
accidentally. When the On Air Lock is enabled, the on air channel can only be deactivated
by first 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 finger in the
slot in the rear panel, indicated by the “ON AIR LOCK” text on the top panel, then slide your
finger down the slot until you reach the pushbutton.
Talkback Controls
The TALKBACK GANG switch links the operation of each of the commentator’s TALKBACK
A, B, C and D buttons. When this switch is on, pressing one of the TALKBACK buttons
automatically activates the other TALKBACK buttons. Up to an additional 12dB of gain
is available on all talkback outputs, if required. This is applied prior to the limiter and is
adjusted using the rear panel GAIN potentiometer.
Limiter Controls
The LIMITER ON/OFF switch and LEVEL potentiometer control the limiter that is applied to
the Mix Output. 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 CM-CU1 has a built in test tone generator which selectively routes a line-up tone to
all outputs to assist channel identification and cabling checks. There are two test tone
modes; manual and auto. Regardless of mode, a 1kHz tone is permanently routed to the
Mix Output and the PPM meter will indicate that the signal level is 0dBu. The test tone is
enabled by sliding the TEST TONE switch to the upper “ON” position. To change the test
tone mode; keep the Talkback B and Talkback C buttons pressed for 2.5 seconds.

CM-CU1 Commentator Unit User Handbook 7
REAR PANEL CONTROLS & CONNECTIONS
REAR PANEL CONTROLS & CONNECTIONS 4
Test Tone Manual Mode
With the test tone in manual mode, the ON AIR and TALKBACK buttons flash amber. The
test tone can be routed to the Comm and Talkback Outputs by pressing the ON AIR or
corresponding TALKBACK buttons. The ON AIR button illuminates red when pressed and
the TALKBACK buttons illuminate green. When the button is released, the tone on that
output is muted.
Test Tone Auto Mode
With the test tone in auto mode, each of the Comm and Talkback outputs are automatically
identified by a unique number of short tone bursts, lasting 0.25 seconds each, which
are repeated every 3 seconds. Each button flashes when tone is being routed to the
corresponding output. The number of pulses on each output is shown below:
Comm 1 pulse
Talkback A 2 pulses
Talkback B 3 pulses
Talkback C 4 pulses
Talkback D 5 pulses
The 5 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 return to the state they
were in prior to entering test tone mode.
Return Audio Inputs
The five transformer balanced return audio inputs, Prog, A, B, C and D 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 electronically balanced commentator output, and the transformer balanced talkback
A, B, C and D 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:

8CM-CU1 Commentator Unit User Handbook
REAR PANEL CONTROLS & CONNECTIONS
REAR PANEL CONTROLS & CONNECTIONS
4
Pin 1: 0V
Pin 2: No connection
Pin 3: No connection
Pin 4: +VE (12-24 Volt DC)
When powering the CM-CU1 via the DC supply input, it is important to ensure that 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 CM-CU1’s GPIO port has 5 open-collector driven outputs and 4 active low inputs. The
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 flash 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 ON AIR active – open collector output
2 O TALKBACK A active – open collector output
3 O TALKBACK B active – open collector output
4 O TALKBACK C active – open collector output
5 O TALKBACK D active – open collector output
6 - Digital ground (0V)
7 - Digital ground (0V)
8 - No connection
9 - Digital ground (0V)
10 I TALKBACK A call/alert – active low input
11 I TALKBACK B call/alert – active low input
12 - Digital ground (0V)
13 I TALKBACK C call/alert – active low input
14 I TALKBACK D 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.

CM-CU1 Commentator Unit User Handbook 9
CONFIGURATION OPTIONS
CONFIGURATION OPTIONS 5
5 Configuration Options
The CM-CU1 has several user configurable options that can be changed to suit specific
operational or personal requirements. These options can only be changed by entering a
setup mode, which is accessible when the unit is powered-up.
Entering Setup Mode
Apply power to the unit whilst keeping the TALKBACK A and TALKBACK B buttons pressed
for 5 seconds. The power indicator LED will flash red and amber to indicate that Setup
Mode has been entered. The TALKBACK A and TALKBACK B buttons can now be released.
The configuration options are arranged in 7 pages, with up to 5 options in each page. The
current page number is indicated on the PPM display by a single illuminated segment, e.g.
segment 5 illuminated means that you are on page 5.
Each option within the selected page is associated with one of the 5 main control buttons
on the top panel of the unit. Each button flashes in a recurring sequence to indicate the
current mode setting of the associated option. One flash equals mode 1, two flashes equals
mode 2 etc. Buttons that do not have an associated option in the current page do not flash.
Please note: when page 6 is selected, all the segments in the PPM display are enabled to
indicate the current PPM illumination level setting.
Changing The Current Page
Press and hold the ON AIR button for at least 1 second. The PPM display will change to
indicate the new page.
Changing The Option Mode Setting
Press the appropriate button once. The number of flashes increases to indicate the new
mode setting. Once the maximum option mode setting has been reached, the value wraps
around to mode 1.
The configuration option settings for each page are listed below. The factory default
settings for each option are shown in brackets:
Config Page 1 - ON AIR Button Enable/Disable & TALKBACK Button Latching Modes
ON AIR button:
Mode 1 ON AIR is permanently disabled and cannot be selected.
Mode 2 ON AIR can be selected as normal (default).
Mode 3 ON AIR is permanently selected and cannot be disabled.
TALKBACK A button:
Mode 1 TALKBACK A button momentary mode enabled (default).
Mode 2 TALKBACK A button latching mode enabled.
Mode 3 TALKBACK A button momentary and latching modes enabled.
TALKBACK B button:
Mode 1 TALKBACK B button momentary mode enabled (default).
Mode 2 TALKBACK B button latching mode enabled.
Mode 3 TALKBACK B button momentary and latching modes enabled.

10 CM-CU1 Commentator Unit User Handbook
CONFIGURATION OPTIONS
CONFIGURATION OPTIONS
5
TALKBACK C button:
Mode 1 TALKBACK C button momentary mode enabled (default).
Mode 2 TALKBACK C button latching mode enabled.
Mode 3 TALKBACK C button momentary and latching modes
enabled.
TALKBACK D button:
Mode 1 TALKBACK D button momentary mode enabled (default).
Mode 2 TALKBACK D button latching mode enabled.
Mode 3 TALKBACK D button momentary and latching modes enabled.
Please note:
Momentary mode button operation – press to activate, release to deactivate.
Latching mode button operation – press once to activate, press again to deactivate.
Momentary and latching mode button operation - for momentary press the button for less
than 0.25sec, for latching press for more than 0.25 sec
Config Page 2 - Line Input Routing to Output
ON AIR button:
Mode 1 Line input permanently routed to Mix Output (default).
Mode 2 Line input is permanently unrouted to Mix Output.
Mode 3 Line input routed to Mix Output only when ON AIR is active.
TALKBACK A, B, C & D buttons:
No associated option on this page.
Config Page 3 - Commentator Mic & Line Input Routing to Headphones
ON AIR button:
Mode 1 Commentator input permanently routed to Commentator headphones.
Mode 2 Commentator input routed to Commentator headphones only when ON AIR
is active (default).
TALKBACK A button:
Mode 1 Line input routed to Commentator headphones only when ON AIR is active
(provided line input is not permanently unrouted to mix output).
Mode 2 Line input permanently routed to Commentator headphones (default).
TALKBACK B, C & D buttons:
No associated option on this page.
Config Page 4 - No Function
ON AIR button & TALKBACK A, B, C & D buttons:
No associated option on this page.