Audio Technica ATUC-M43H/58H User manual

Instruction manual
Digital Conference System
ATUC-50
Gooseneck Microphone with LED Ring
ATUC-M43H/58H
Discussion Unit
ATUC-50DU
Interpretation Unit
ATUC-50INT
Control Unit
ATUC-50CU
Integration Unit
ATUC-50IU
Link Extender
ATLK-EXT165

2
Table of Contents
Introduction .......................................... 4
About this manual.................................................. 4
About the information in this manual ..................................... 4
About registered trademarks and copyrights .......................... 4
Included accessories for the ATUC‑50CU ..............4
Included accessories for the ATUC‑50IU ...............4
Included accessories for the ATLK‑EXT165 ........... 4
System placement ..................................................5
Installing the CU(s) in a rack................................................... 5
Unbalanced connection............................................................ 5
AC power cord connection....................................................... 5
When cleaning the units........................................................... 5
ATUC-50 System..................................... 6
Features ..................................................................6
Features of ATUC-50 system ................................................... 6
About Audio-Technica LINK ................................................... 6
Features of ATUC-50CU.......................................................... 6
Features of ATUC-50DU/INT ................................................ 6
Features of ATUC-50IU ........................................................... 6
Features of ATLK-EXT165....................................................... 7
Features of ATUC-M43H/58H................................................ 7
Optional products (sold separately by Audio Technica) ........ 7
Connection example of digital conference
system ATUC‑50......................................................8
Part Names and Functions ..................... 9
ATUC‑50CU.............................................................. 9
Front panel ................................................................................ 9
Rear panel................................................................................ 11
ATUC‑50DU ...........................................................12
ATUC‑50INT...........................................................13
Common to ATUC‑50DU/INT ................................14
ATUC‑M .................................................................14
ATUC‑50IU.............................................................15
ATLK‑EXT165.........................................................21
Changing settings from ATUC‑50CU ...................22
Entering letters ....................................................23
Overview of the Interpretation Unit
(ATUC‑50INT) ........................................................24
System Connections and
Configuration ...................................... 26
Connecting devices..............................................26
󱫀Connecting the DUs/INTs to the CU.............................. 26
󱫂Connecting the DUs/INTs together ................................ 27
󱫄Connecting the microphone ATUC-M to
the DU/INT ...................................................................... 30
󱫆Connecting an amplifier ................................................... 30
󱫈Turning on the CU and testing DU operations ............... 30
󱫊Connecting to a network .................................................. 31
󱫌Connecting a computer or mobile device to a network .. 31
Preparing to use Web Remote .............................33
What is Web Remote?............................................................. 33
Setting up “Locate”................................................................. 33
Configuring and Operating
Conferences Using the Web Remote
Control Function.................................. 34
About Web Remote ..............................................34
Overall structure of Web Remote .......................................... 34
Starting up Web Remote and preparing
for operations.......................................................35
Starting up and logging in to Web Remote............................ 35
About Web Remote Home screen .......................................... 35
Configuring detailed system settings
([Settings & Maintenance]) ..................................36
How to operate the [Settings & Maintenance] menu ........... 36
Menu item 󰴤([System Settings]) ........................................ 37
Menu item 󰴥([Install Settings]).......................................... 42
Accessing your presets ([Presets]) ........................................ 54
Log management ([Logging]) ............................................... 54
Displaying the system information ([System Info])............. 54
Preparing for conferences
([Setup Conference]) ............................................55
󱫀Recalling the preset ([Recall Preset]) ............................. 55
󱫂Changing the conference settings
([Conference Settings]) ................................................... 55
󱫄Adjusting the DU/IU settings
([DU/IU Settings], [DU/IU Detail Settings]) ............... 56
Operating and controlling conferences
([Start Conference]) .............................................57
󱫀Operating conferences ([Conference Manager])............ 57
󱫂Configuring the advanced audio-related settings and
performing audio operations ([Audio Control]) ............ 58
󱫄Configuring conference settings
([Conference Settings]) ................................................... 58

3
Information.......................................... 59
Troubleshooting...................................................59
ATUC-50CU........................................................................... 59
ATUC-50DU/INT.................................................................. 60
Web Remote............................................................................ 61
ATUC-50IU ............................................................................ 61
ATLK-EXT165........................................................................ 61
Error messages .....................................................62
Specifications ...................................... 66
ATUC‑50CU specifications....................................66
General specifications ............................................................ 66
Input/output specifications ................................................... 67
ATUC‑50DU/INT specifications ............................68
General specifications ............................................................ 68
Input/output specifications ................................................... 69
ATUC‑50IU specifications.....................................70
General specifications ............................................................ 70
ATLK‑EXT165 specifications.................................72
General specifications ............................................................ 72
ATUC‑M specifications .........................................73

4
Introduction
About this manual
About the information in this manual
The images and screenshots shown in this manual may differ from
the actual product.
Device names
The device names are abbreviated as follows.
• CU: “Control Unit” ATUC-50CU
• DU: “Discussion Unit” ATUC-50DU
• INT: “Interpretation Unit” ATUC-50INT
• ATUC-M: “Gooseneck Microphone with LED Ring”
ATUC-M43H/ATUC-M58H
• IU: “Integration Unit” ATUC-50IU
• EXT: “Link Extender” ATLK-EXT165
Symbols
➤
Indicates the page(s) where you can find more detailed
or related information.
NOTICE Indicates a risk that may result in malfunction or damage
to the device.
Indicates supplementary information as well as tips &
advice for operations.
[ ] Indicates menu items on the Web Remote screen.
Operations on mobile devices
Operations in this manual assume that you are using a computer as a
control device. Alternatively you can use a mobile device such as a
tablet. Instead of clicking or double-clicking, operate the application
by tapping.
About registered trademarks and
copyrights
• Apple, the Apple logo, iPad and Mac OS are trademarks of Apple
Inc., registered in the U.S. and other countries. App Store is a
service mark of Apple Inc.
• Google Play and the Google Play logo are registered trademarks
or trademarks of Google Inc.
• Other product names, service names, logos and/or company
names used in this manual are trademarked and copyrighted
properties of their respective owners and/or licensors.
In this manual, the TM and ®mark may not be specified.
Included accessories for the
ATUC-50CU
The following accessories and documentation are provided.
• AC power cord
• Euroblock connector (9 pieces)
• Quick Setup Guide—English version
• Quick Setup Guide—Multi-language version
Included accessories for the
ATUC-50IU
The following accessories and documentation are provided.
• Euroblock connector (13 pieces (Green x 3, Black x 10))
• Quick Start Guide—Multi-language version
Included accessories for the
ATLK-EXT165
The following accessories and documentation are provided.
• Euroblock connector
• Power cable
• Table mount kit (Table mount x 2, Screw x 4)
• Quick Start Guide—Multi-language version

5
System placement
Installing the CU(s) in a rack
Rack requirements for the CU
• EIA standard compatible 19-inch rack
• 1U-size rack mounting
• Rack equipped with safety guardrails to support the CU and a
board on which the CU is to be placed
When installing the CU(s) in a rack, keep the temperature within
the rack below 45°C (113°F). High temperature may damage the
internal components, causing a malfunction.
Leave a space of 10cm or more on each side (top, right and left,
rear) between the CU and other devices or the rack.
Rack mounting angles are fixed to the CU using the following
screws. When using screws other than those listed here, check the
specifications.
• S TIGHT tapping screws with nominal diameter 4×6mm*
* Substitutable for M4×6mm machine screws
Unbalanced connection
Since induction noises tend to occur due to difference in electric
potential of chassis:
• Keep the chassis between each device at the same electric
potential.
• Use the same power system.
• Connect to the GND (ground) terminal or chassis ground of each
device.
AC power cord connection
Be sure to connect the AC power cord into a properly grounded wall
outlet. Improper grounding can cause electrical shock.
When cleaning the units
Do not use any solvents or chemicals such as benzine, thinner,
alcohol or electrical contact cleaner and protector. Doing so may
cause deformation, damage and malfunction of the units.

6
ATUC-50 System
Features
Features of ATUC‑50 system
• Audio processing by the feedback processor and the like enables
clear-sounding conversations
• Up to 6 interpretation units (ATUC-50INT) can be connected.
• The maximum number of discussion unit (ATUC-50DU),
integration unit (ATUC-50IU), and interpretation unit (ATUC-
50INT) connections is 300 (with 3 CU Links)
• Either daisy-chain or ring connection can be made with Cat5e or
higher cables (shielded cables with conductor size of 24AWG or
higher in diameter are recommended).
• 3 selectable conference modes: Free Talk Mode, Request Talk
Mode, and Full Remote Mode
• 2-language interpretation, 3-language interpretation, and
3-language relay interpretation are supported (ATUC-50INT)
• The recording function enables you to record audio onto a USB
device (mass storage device)
• Controllable using Web Remote and an external control device
• Design with future expansion considered
About Audio‑Technica LINK
The system adopts the unique format Audio-Technica LINK for
power supply and signal transmission between the control unit(s)
(ATUC-50CU), discussion unit(s) (ATUC-50DU), etc.
Audio-Technica LINK is compatible with the Ethernet standards
and allows a simple construction for universal Cat5e or higher cable
connections. (A shielded cable with conductor size of 24AWG or
higher in diameter is recommended.) Transmission of high-speed
signals with low-latency allows stable control and uncompressed
audio signal transmission.
Features of ATUC‑50CU
• Power supply and control is possible for a maximum of 100
discussion units (ATUC-50DU) (depending on the cable lengths
ATLK-EXT165 may be required)
• Up to 300 conference microphones (ATUC-50DU + ATUC-M)
can be connected by cascade-connection
• 4 configurable balanced matrix output plus 1 unbalanced output
that outputs the same audio as Output 1
• 2 Mic/Line inputs, 2 monaural AUX inputs, and 2 return inputs
• 2 return channels are available for both bilingual simultaneous
interpretation and the language of the floor holder
• Conference mode: Free Talk, Request Talk, and Full Remote
• Priority mode: First-press priority and later-press (FIFO, LIFO)
priority
• Talk mode: Manual mode, Voice activation mode
• Web Remote enables you to easily change settings and control
attendees' right to talk during conference
• Up to 4 channels (WAV: up to 4 channels, MP3: up to 2 channels)
can be recorded on a USB device (mass storage device)
• Audio processing by the feedback suppressor and the like enables
the control unit to deliver high-quality sound
• Design with future expansion and renewal considered
Features of ATUC‑50DU/INT
• An LED ring enables power supply via 3-pin balanced connector
while offering both high sound quality and user flexibility
• ATUC-M and standard 3-pin microphone can be connected
• A microphone amplifier with discrete transistors reduces noise;
moreover individual gain is adjustable
• A high-quality and high-resolution speaker
• Designed for the high sound qualities of 24 bit/48 kHz
• Multiple independent indicators (ATUC-M ring LED,
multicolored LEDs both on the rear side and on the (talk)
button)
• High-visibility indicators associated with the headphone volume
adjustment buttons and monitor channel selection buttons
• Optional removable bottom weight for improved stability
• 2 RJ-45 terminals for connecting discussion units (ATUC-50DU);
1 expansion RJ-11 terminal for future expansions
• 1 headphone output jack with a monitoring channel switch
function
Features of ATUC‑50IU
• Discussion units that can be embedded in the ATUC-50 system
• Configure the system simply by connecting the microphones,
speakers, headphones, etc.
• GPIO control terminal built in for monitoring conditions and
controlling external devices
• Equipped with 2 RJ-45 terminals for connecting discussion units
(ATUC-50DU), etc.
• Designed for the high sound qualities of 24 bit/48 kHz
• Integration unit (ATUC-50IU) can be set from the web remote for
the chairperson/delegate names
• Conference Mode and volume can be set for each integration unit
(ATUC-50IU)

7
Features of ATLK‑EXT165
• Connects to any Audio Technica device, such as a control unit
(ATUC-50CU), or discussion unit (ATUC-50DU), and is
equipped with two RJ-45 terminals that can expand the discussion
system
• Remote mode that automatically starts from the control unit
(ATUC-50CU)
• Has a standalone mode that can be started by operating the front
panel
• Equipped with GPO terminal that notifies external devices when
an overcurrent (2.6 A) is detected in the power supplied from
RJ-45 terminals
Features of ATUC‑M43H/58H
• Equipped with an LED ring that enables power supply via 3-pin
balanced connector while offering both high sound quality and
user flexibility
• Adopted mechanics between the microphone connector and the
discussion unit (ATUC-50DU) reduce vibration
• Adopted a double layer pop filter (windscreen inside the
microphone)
• Improves RF measures against external radio waves
• 2 types of microphones (430mm and 580mm length)
Optional products (sold separately by
Audio Technica)
Model
number Name Use
ATUC-DUWT DISCUSSION UNIT
WEIGHT PLATE
Use this to improve the
reliability of installation for
the discussion unit (ATUC-
50DU).
AT8643 RACK MOUNT KIT Use this when rack mounting
half-rack sized products, such
as link extenders (ATLK-
EXT165).

8
Connection example of digital conference system ATUC-50
CU (extension)
CU (extension)
Microphone
IU
IU
DU
(Maximum 50 units)* (Maximum 50 units)*
EXT EXT
Windows/Mac Tablet
Switching hub
Router
AP
Amplifier
Recorder
Speaker
CU (primary)
CD player
USB device (mass storage
device) to be used for
recording/SFX
Web Remote
Control
Web Remote
Control
INT
IU
DU
*The number of connectable units differs depending on the system configuration that you are using. For more details, refer to
➤
page 28.

9
Part Names and Functions
ATUC-50CU
Front panel
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑩ ⑪ ⑫⑨
󰴤Power switch
Turns the power of the CU on and off.
󰴥USB terminal
The following operations can be performed by connecting a USB
device (mass storage device) such as a USB flash drive or USB
hard drive.
• Recording sound (
➤
page 65)
• Playing buzzer and chime (
➤
page 65)
• Importing/exporting preset data (
➤
page 61)
• Upgrading the firmware (
➤
page 46)
NOTICE • Supports FAT16 and FAT32 file systems
• Maximum storage capacity: 2TB
• Maximum file size: 2GB
• Does not support USB hubs.
• Do not use extension cables.
• Do not attempt to use USB devices (mass storage
devices) that have been cracked, deformed or repaired
using adhesive tape or the like.
• Do not save or create any files or folders unnecessary for
this system on the USB device (mass storage device);
doing so may affect system operations.
• The CU is not compatible with USB devices (mass
storage device) with special functions such as a security
function.
󰴦USB access indicator
Indicates the connection status of the USB device (mass storage
device).
• In an access state: lit green
NOTICE • Do not remove the USB device (mass storage device)
while the indicator is lit green; doing so may destroy
data.
󰴧REC (recording) indicator
Indicates the recording status.
• In a recording state: lit green
• In a recording-pause state: blinks green
• While not recording: remains off
NOTICE • If you remove the USB device (mass storage device)
while in a recording state or recording-pause state, the
recorded file may not be written correctly. Do not
remove the USB device (mass storage device) during
recording.
󰴨DU POWER (DU power supply) indicator
• In a normal state: lit green
• In an abnormal state (such as when a voltage drop occurs in the
48V output system): blinks green
• In a DU/INT disconnected state: remains off
󰴩DU CHAIN indicator
• In a normal state: lit green
• In an abnormal state (such as when failing in communication
with a DU): blinks green
• In a DU/INT disconnected state: remains off
󰴪CU LINK indicator
• In a CU Link state: lit green
• In an abnormal state (such as when failing in communication
with a CU): blinks green
• In a CU Link cut-off state: remains off
󰴫Remote (remote control) indicator
• In a communication state: lit green
• In an abnormal state (such as when failing in external
transmission retry): blinks green
• In a non-communication state: remains off
󰴬SIGNAL/PEAK indicator
Indicates the audio signal level as follows:
– 60dBFS or higher: lit green
– 20dBFS or higher: lit amber
– 2dBFS or higher: lit red
Adjust the audio signal level such that the indicator will not light
red (
➤
page 65).
󰴭CU display
󰴮BACK button
Returns to the previous or upper screen/item.
Press and hold this button to return to the HOME screen from
any screen.

10
󰴯Jog dial/ENTER button
Rotate the jog dial to select the desired item and then press the
ENTER button to confirm.
Rotating the jog dial also adjusts the setting values.
• Locking the operation buttons (Key Lock function)
Press the BACK button and ENTER button simultaneously for
over 2 seconds to activate the Key lock function, and thus lock
all front panel operations except for the Power switch.
• Unlocking the operation buttons
When the operation buttons are locked, press the BACK
button and ENTER button simultaneously for over 2 seconds
to unlock the operation buttons.
CU display and jog dial operations:
1 2 3 4
HOME screen
The item with ▶◀ is the currently selected item.
By rotating the jog dial, move ▶◀ to select the operation you
want to perform and then press the ENTER button.
󱫀Master level adjustment (Lvl)
-50 -40 -30 -20 -12 -6 0 6 12
Master level
Peak (dBu)
• Rotate the jog dial to adjust the CU output level (OUTPUT 1).
• While pressing the ENTER button, rotate the jog dial to adjust
the level in 10-step increments.
• Be sure that the Peak indicator does not light up while
adjusting the level.
󱫂Recording operations (Rec)
R
(Remaining recording time)/
E
(Elapsed recording time) display
-50 -40 -30 -20 -12 -6 0 6 12
Peak (dBu)
• Rotate the jog dial to select
Rec
(Start recording)/
Pau
(Pause)/
Stp
(Stop)/
R
or
E
(Recording time display) and
then press the ENTER button to confirm.
• Select the time display on the top right side of the screen using
the jog dial and then press the ENTER button to switch the
display between
R
(Remaining recording time)/
E
(Elapsed
recording time).
• To adjust the recording level, move ▶◀ to the recording level
meter at the top left of the screen to display
Rec Lvl
and then
press the ENTER button to enter recording level adjustment
mode. Rotate the dial to adjust the recording level being sure
that the Peak indicator does not light up.
• While pressing the ENTER button, rotate the jog dial to adjust
the level in 10-step increments.
󱫄Conference preparation (Pst)
• [1]
Recall Presets
: Rotate the jog dial to move “>” to the item
you want to recall and then press the ENTER button to
confirm.
• [2]
Conf. Setup
: Change or check the conference settings.
Rotate the jog dial to move “>” to the item you want to change
or check and then press the ENTER button to confirm.
Pst Menu Items:
Settings can also be configured via Web Remote. The item
names in parentheses () are used for Web Remote.
[1]
Recall Presets
[2]
Conf. Setup
(
➤
page 52)
01 Conference Mode
(Conference Mode)
02 NOM
(Number of Open Mics)
03 Auto Mic Off
(Auto Mic OFF)
04 Override Mode
(Override Mode)
05 Max Queue
(Maximum in Queue)
06 MicON Trigger
(Mic ON Trigger / Mic ON Trigger for
Priority)
07 MicON Hold Time
(Mic ON Hold Time)
08 Interrupt Option
(Interrupt Option)
• Items that can be configured from [2]
Conf. Setup
differ
depending on the conference mode.
• For details on items, see “Menu items” (
➤
pages 44-
60).
󱫆Configuring settings (Set)
Rotate the jog dial to move “>” to the desired item or value and
then press the ENTER button to confirm.
For details on setting items, see “Set Menu Items” (
➤
page 22).

11
Rear panel
⑬ ㉒⑭ ⑮ ⑯ ⑱⑰ ⑲ ⑳ ㉑
* The serial number label is located on the top panel.
NOTICE • Refer also to the instruction manuals supplied with the
external devices.
• Be careful NOT to connect the Ethernet cable from your
network device to the CU LINK terminal or DU CHAIN
terminal. This can cause damage to the connected device.
󰴰NETWORK terminal
• RJ-45
• Use for connecting to a local area network when controlling
from an external device via the Web Remote Control or IP
remote function (
➤
page 38)
󰴱CU LINK A/B terminals, DU CHAIN C/D terminals
• RJ-45
• Use for cascading multiple CUs (
➤
page 36).
You can also configure these terminals as DU/IU/INT
terminals (
➤
page 27)
󰴲DU CHAIN A/B terminals
• RJ-45
• Use for connecting DUs/IUs/INTs. You can daisy-chain
multiple DUs/IUs/INTs as well as ring multiple DUs/IUs/
INTs using the A/B terminals
• By cascade-connecting multiple CUs, up to 300 DUs/
IUs/INTs can be connected (with a maximum of 6
INTs). (
➤
page 36).
󰴳Analog output (balanced) terminals: OUTPUT 1-4 (BAL)
• Euroblock
• Pin arrangement: “+” Hot/“–” Cold/“G” GND
󰴴Analog output (unbalanced) terminals: OUTPUT1
(UNBAL)
• Euroblock
• Pin arrangement: “SIG” Signal (2 systems)/“G” GND
󰴵Analog input (unbalanced) terminals: INPUT (AUX)
• RCA
󰴶Analog input (balanced) terminals: INPUT (MIC/LINE
1-2)
• Euroblock
• Pin arrangement: “+” Hot (supports phantom power)/
“–” Cold (supports phantom power)/“G” GND
• The input type can be switched between MIC and LINE
(
➤
page 49)
󰴷Analog input (balanced) terminal:
INPUT(INTERPRETATION RETURN 1-2)
• Euroblock
• Pin arrangement: “+” Hot/“–” Cold/“G” GND
• Inputs audio signals from simultaneous interpretation system
󰼼Ground screw
Since the supplied AC power cord has a three-pronged plug, as
long as your AC power wall outlet is grounded properly, the CU
will also be grounded properly.
󰽇AC Inlet (AC IN)
Connect the supplied AC power cord.
NOTICE • Do not plug in the AC power cord until all other
connections have been completed.
• Be sure that the CU is securely grounded to a single
ground point. Grounding to multiple ground points can
cause ground loops, resulting in noise generation such as
a humming noise.

12
ATUC-50DU
②
③
④
①
⑤
⑦
⑥
󰴤Display
When changing monitor channel or adjusting the volume level,
the currently set value is displayed.
󰴥Microphone release lever
󰴦Microphone jack
Connect a microphone.
• A typical 3-pin XLR type microphone as well as the ATUC-M
series microphone can be connected.
󰴧</> Monitor channel selection buttons
When operating the </> monitor channel selection buttons, the
currently selected monitor channel is shown on the display 󰴤.
FL: Monitors speech from the floor channel.
01-03: Monitors speech from groups 1 to 3. Speech interpreted
by interpretation units is added to the speech from groups 1 to
3 when INTs are connected on the same system.
–/+ Headphone volume adjustment buttons
When operating the –/+ headphone adjustment buttons, the
current volume level (0 to 20) is shown on the display 󰴤.
󰴨Built-in speaker
Outputs conference audio.
󰴩(talk) LED
Displays DU talk status.
• While talking: lit red
• When requested to talk (in standby mode): blinks green
• When talk request is rejected: blinks green (quickly blinks 4
times)
• The LED colors can be changed (
➤
page 53).
󰴪(talk) button
Press this button to send a request to talk. Press the button again
to finish talking or cancel the request to talk. DUs designated as
a priority DU can cut other DU speakers short and mute other
DUs by pressing this button.
Operations when the (talk) button is pressed briefly:
Conference
mode Current state
Mic ON Trigger mode
Button Voice
Free Talk
Talk OFF Talk ON
-
(Not acceptable)
Requesting to
talk Cancel request
Talk ON Talk OFF
Request Talk
Talk OFF Request to talk
Requesting to
talk Cancel request
Talk ON Talk OFF
Full Remote -- (External control only)
• On priority DUs, operations of the priority DUs are same
as in Free Talk Mode regardless of the conference mode.
Operations when the (talk) button is pressed and
held:
Only for Priority DUs with [Can Cut/Mute] set to on
Current
state
Mic ON Trigger mode
Button Voice Button/Voice
Press the button
for 2 seconds or less
Cut mode Mute mode
Press and hold the button
for over 2 seconds
Talk OFF Talk ON
-
(Not
acceptable)
Talk
ON(*1)
Talk
ON(*2)
Talk ON Talk OFF
Talk ON
stays
active(*1)
Talk ON
stays
active(*2)
*1 All specified DUs will be in Talk OFF state.
*2 All specified DUs will be in mute state.

13
ATUC-50INT
②
③
④
①
⑦
⑧
⑤
⑥
VOL.
A B
󰴤Display
• Character on the left: Displays the current monitor channel.
F: Monitors speech from the floor channel (speech from all
meeting participants).
1: Monitors speech from language group 1.
• Digit on the right: Displays the language group (1 to 3)
assigned to the INT output.
When adjusting the volume level, the set value is displayed.
󰴥Microphone release lever
󰴦Microphone jack
Connect a microphone.
A typical 3-pin XLR type microphone as well as the ATUC-M series
microphone can be connected.
󰴧Monitor channel selection button
Switches the speech from the floor channel and the speech from
language group 1 each time it is pressed.
󰴨
VOL.
Headphone volume adjustment button
When operating this button, the current volume level (0 to 20) is
shown on the display ①. The volume is adjusted by operating
the /buttons ⑥ while in this state.
Operating this button while the volume level is displayed takes
you back to the monitoring channel display.
󰴩A/ BInterpretation languages selection buttons
(only available in bi-directional interpretation)
This function is only available when bi-directional interpretation
has been selected. (Outgoing language A/Outgoing language B)
Switches the location of the interpretation speech being output
according to the interpretation pattern.
󰴪(Talk) LED
Displays INT talk status.
󰴫(Talk) button
Press this button to talk. Press the button again to finish talking.

14
Common to ATUC-50DU/INT
①
③ ④
②
⑥
⑤
󰴤Headphone jack
Speech from the selected monitor channel is output.
󰴥Rear LED
The LED color can be set for each DU. It is useful when dividing
DUs into groups by color. The LED color can be changed from
Web Remote (
➤
page 53).
NOTICE • Color settings cannot be done for INTs. The settings
stay at their default.
󰴦Extension terminal
󰴧DU/CU connection terminals (
➤
page 26)
󰴨Bottom cover
Covering the terminals protects them from dust and also
prevents cables from becoming unplugged. Therefore, after
connecting cables to each terminal, be sure to attach the bottom
cover.
󰴩Serial number
ATUC-M
③
①
②
󰴤Microphone
󰴥Ring LED
Lights red when the microphone is activated.
Blinks red while waiting to talk.
󰴦Connector

15
ATUC-50IU
󰴤
100
116
100
86
117
173
100
50
24
φ5
φ5
φ5
φ12
25 13.5
󰴥
󰴦
󰴧
󰴨
38
󰴩
󰴪
󰴫
󰴬
Because the IU is intended to be embedded in a table, etc., when it is used, the user interfaces, such as displays, operating terminals, and input/
output terminals, can be customized according to their usage environment.
Specifications for the interfaces are as follows.
󰴤Microphone input terminal
Pin
number Signal name Explanation Terminal color
1GND Microphone input GND
Green
2COLD Microphone input balance
Supplies a phantom power supply of +48 V (possible to toggle on/off)
3HOT
4RING LED For controlling ATUC-M LED
󰴥Speaker output terminal
Pin
number Signal name Explanation Terminal color
5HOT Speaker output
1.4 W, 8 Ω (impedance over 4 Ω) Green
6COLD
• We recommend using a shielded wire for the speaker output terminal. The GND shield in this case is connected to the GND pin (9).
󰴦Headphone output terminal
Pin
number Signal name Explanation Terminal color
7L ch Headphone output
15 mW 32 Ω Green8R ch
9GND Headphone output GND

16
󰴧Status output terminal
Pin
number Signal name Explanation Terminal color
10 TALK LED :
OPEN/CLOSE
Talk ON: Close
Talk OFF: Open
Requesting to talk (waiting): blinks
Talk request is rejected: blinks quickly
Black
11 TALK LED :
LOW/HI
Terminal for AT8657/LED and U891RCx
Talk ON: +5 V
Talk OFF: 0 V
On/off operations are synchronized with the open/close operations for the
TALK LED pin (10)
12 FLOOR LED
Selecting the floor channel on the monitor channel
When selected: Close
When unselected: Open
13 LANGUAGE1 LED
Selecting group 1 on the monitor channel
When selected: Close
When unselected: Open
14 LANGUAGE2 LED
Selecting group 2 on the monitor channel
When selected: Close
When unselected: Open
15 LANGUAGE3 LED
Selecting group 3 on the monitor channel
When selected: Close
When unselected: Open
󰴨Operation input terminal
Pin
number Signal name Explanation Terminal color
16 CHANNEL Selecting the monitor's channel
Black
17 VOL. UP Adjusting the headphones' volume
18 VOL. DOWN
19 TALK ON
Request to talk
Yes: Close
No: Open
20 CUT/MUTE
Request to mute/cut microphone
Yes: Close
No: Open
21 TALK ON
(INVERT)
AT8657/LED dedicated terminal
Request to talk
Yes: +5 V
No: 0 V
The function of this pin is the same as that of the TALK ON pin (19)
*When there is a TALK ON or TALK ON (INVERT) request to talk, the
system handles them both as requests to talk.
󰴩Power supply output terminal
Pin
number Signal name Explanation Terminal color
22 5 V Power supply for LED is 5 V Black
23 GND Power supply GND
󰴪General purpose input terminals (GPI)
Pin
number Signal name Explanation Terminal color
24 GPI0 General purpose input terminal 0
Black
25 GPI1 General purpose input terminal 1
26 GPI2 General purpose input terminal 2
27 GPI3 General purpose input terminal 3
28 GPI4 General purpose input terminal 4
29 GPI5 General purpose input terminal 5
30 GPI6 General purpose input terminal 6
31 GPI7 General purpose input terminal 7

17
󰴫General purpose output terminals (GPO)
Pin
number Signal name Explanation Terminal color
32 GPO0 General purpose output terminal 0
Black
33 GPO1 General purpose output terminal 1
34 GPO2 General purpose output terminal 2
35 GPO3 General purpose output terminal 3
36 GPO4 General purpose output terminal 4
37 GPO5 General purpose output terminal 5
38 GPO6 General purpose output terminal 6
39 GPO7 General purpose output terminal 7
• You can assign functions to the general purpose input/output terminals (GPI and GPO) on the web remote’s settings screen. (
➤
page 56)
󰴬Audio Technica LINK terminal
Connect the Audio Technica products and configure the system.
NOTICE • Power is supplied to external devices from the 5 V pin (22); however this pin has a maximum rating of +5 VDC at 100 mA. When you
use this, select a circuit or current limit (resistance value) so that the rating is not exceeded.
• If this is used beyond its ratings, it may cause the product to malfunction, but even more so, it may cause fires or unforeseen
accidents.

18
Example of a user interface connection
1 2 3 4 5 6 7 8 9
22 10 22 12 22 13 22 14 22 15
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 392019181716151413121110
TALK LED
OPEN/CLOSE
FLOOR
LED
LANGUAGE 1
LED
LANGUAGE 2
LED
LANGUAGE 3
LED
16 23 17 23 18 23 19 23 20 23
CHANNEL VOL. UP VOL. DOWN TALK ON CUT/MUTE
22 32
GPO 0
22 39
GPO 7
IN
入力ピン
(23pin GND) (22pin 5V)
出力ピン
最大
7mA
IN
24 23 31 23
GPI 0 GPI 7
Input pin Output pin
Max.
7 mA
When using with the ATUC-M
FG
XLR
Receptacle
ATUC-50IU
GND1
21
3
COLD2
HOT3
RING LED4
XLR
Receptacle

19
When using with the AT8657/LED
ATUC-50IU
GND1
51
2 4
3
COLD2
HOT3
TALK LED: LOW/HI11
TALK ON (INVERT)21
When using with the U891RCx
BK: GND
WH: LED CONTROL
BL: CONTACT CLOSURE
RD: COLD
YL: HOT
SH: GND
ATUC-50IU
GND1
COLD2
HOT3
TALK LED: LOW/HI11
TALK ON19
GND23
• Do the following settings for the U891RCx.
SW.FUNCTION: MOM. ON
CONTROL: LED Remote
Mounting an IU
• When securing in two directions
Align the IU with the edge of a table, etc., and then fasten it with screws.

20
• When securing on only one side
Leave about 2 mm of the screws out when you fasten them to the table, and then hang the IU on them. Slide the IU downward, and then tighten
the screws to secure the IU.
Suspend screws about 2 mm
Tighten screws securely
• You can also mount the IU upside-down or sideways. When mounting, fasten at a minimum of two places with screws.