Audio Technica ATUC-M43H User manual

Instruction manual
Digital Conference System
ATUC-50
Gooseneck Microphone with LED Ring
ATUC-M43H/58H
Discussion Unit
ATUC-50DU
Control Unit
ATUC-50CU

2
Table of Contents
Introduction .......................................... 3
About this manual.................................................. 3
About the information in this manual ..................................... 3
About registered trademarks and copyrights .......................... 3
Included accessories for the ATUC‑50CU ..............3
System placement ..................................................3
Installing the CU(s) in a rack................................................... 3
Unbalanced connection............................................................ 3
AC power cord connection....................................................... 3
When cleaning the units........................................................... 3
ATUC-50 System..................................... 4
Features ..................................................................4
Features of ATUC-50 system ................................................... 4
About Audio-Technica LINK ................................................... 4
Features of ATUC-50CU.......................................................... 4
Features of ATUC-50DU.......................................................... 4
Features of ATUC-M43H/58H................................................ 4
Connection example of digital conference
system ATUC‑50...................................................... 5
Part Names and Functions ..................... 6
ATUC‑50CU..............................................................6
Front panel ................................................................................ 6
Rear panel.................................................................................. 8
ATUC‑50DU ............................................................. 9
ATUC‑M .................................................................10
Changing settings from ATUC‑50CU ...................11
Entering letters ....................................................12
System Connections and
Configuration ...................................... 13
Connecting devices..............................................13
1Connecting the DUs to the CU ........................................ 13
2Connecting the DUs together........................................... 14
3Connecting the microphone ATUC-M to the DU........... 18
4Connecting an amplifier ................................................... 18
5Turning on the CU and testing DU operations ............... 18
6Connecting to a network .................................................. 19
7Connecting a computer or mobile device to
a network ........................................................................... 19
Preparing to use Web Remote .............................21
What is Web Remote?............................................................. 21
Setting up “Locate”................................................................. 21
Configuring and Operating
Conferences Using the Web Remote
Control Function.................................. 22
About Web Remote ..............................................22
Overall structure of Web Remote .......................................... 22
Starting up Web Remote and preparing for
operations ............................................................23
Starting up and logging in to Web Remote............................ 23
About Web Remote Home screen .......................................... 23
Configuring detailed system settings
([Settings & Maintenance]) ..................................24
How to operate the [Settings & Maintenance] menu ........... 24
Menu item ①([System Settings]) ........................................ 25
Menu item ②([Install Settings]).......................................... 29
Accessing your presets ([Presets]) ........................................ 37
Log management ([Logging]) ............................................... 37
Displaying the system information ([System Info])............. 37
Preparing for conferences
([Setup Conference]) ............................................38
1Recalling the preset ([Recall Preset]) ............................. 38
2Changing the conference settings
([Conference Settings]) ................................................... 38
3Adjusting the DU settings ([DU Settings], [DU Detail
Settings])........................................................................... 39
Operating and controlling conferences ([Start
Conference]) ........................................................40
1Operating conferences ([Conference Manager])............ 40
2Configuring the advanced audio-related settings and
performing audio operations ([Audio Control]) ............ 41
3Configuring conference settings
([Conference Settings]) ................................................... 41
Information.......................................... 42
Troubleshooting...................................................42
ATUC-50CU........................................................................... 42
ATUC-50DU........................................................................... 43
Web Remote............................................................................ 44
Error messages .....................................................45
Specifications ...................................... 48
ATUC‑50CU specifications....................................48
General specifications ............................................................ 48
Input/output specifications ................................................... 49
ATUC‑50DU specifications ...................................50
General specifications ............................................................ 50
Input/output specifications ................................................... 50
ATUC‑M specifications .........................................51

3
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
•ATUC-M: “Gooseneck Microphone with LED Ring”
ATUC-M43H/ATUC-M58H
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
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.

4
ATUC-50 System
Features
Features of ATUC‑50 system
•Audio processing by the feedback processor and the like enables
clear-sounding conversations
•Up to 150 conference microphones (ATUC-50DU + ATUC-M)
can be connected
•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
•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) and conference microphones (ATUC-50DU +
ATUC-M).
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
•Controls up to 50 conference microphones (ATUC-50DU +
ATUC-M) and supplies power to them
•Up to 150 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
•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
•Audio quality of 24bits/48kHz
•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 ports of RJ-45 for connecting discussion units (ATUC-50DU)
and 1 expansion RJ-11 port for future option
•1 headphone output jack with a monitoring channel switch
function
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)

5
Connection example of digital conference system ATUC-50
CU (extension)
CU (extension)
Microphone
DU chain Windows/Mac Tablet
Switching hub
Router
AP
Interpretation
system
Interpretation
system
Amplifier
Recorder
Speaker
ATUC-50CU
(primary)
CD player
USB device (mass storage device)
to be used for recording/SFX
Web Remote
Control
Web Remote
Control

6
Part Names and Functions
ATUC-50CU
Front panel
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑩ ⑪ ⑫⑨
①Power switch
Turns the power of the CU on and off.
②USB 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 41)
•Playing buzzer and chime (
󴀍
page 41)
•Importing/exporting preset data (
󴀍
page 37)
•Upgrading the firmware (
󴀍
page 27)
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.
③USB 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.
④REC (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.
⑤DU 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 disconnected state: remains off
⑥DU 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 disconnected state: remains off
⑦CU 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
⑧Remote (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
⑨SIGNAL/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 41).
⑩CU display
⑪BACK button
Returns to the previous or upper screen/item.
Press and hold this button to return to the HOME screen from
any screen.

7
⑫Jog 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:
󱫀 󱫂 󱫄 󱫆
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.
1Master 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.
2Recording 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.
3Conference 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 34)
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 25-
35).
4Configuring 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 11).

8
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.
⑬NETWORK 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 19)
⑭CU LINK A/B terminals, DU CHAIN C/D terminals
•RJ-45
•Use for cascading multiple CUs (
󴀍
page 17).
You can also configure these terminals as DU terminals (
󴀍
page
14)
⑮DU CHAIN A/B terminals
•RJ-45
•Use for connecting DUs. You can daisy-chain multiple DUs as
well as ring multiple DUs using the A/B terminals
•By cascade-connecting multiple CUs, up to 150 DUs can
be connected (
󴀍
page 17).
⑯Analog output (balanced) terminals: OUTPUT 1-4 (BAL)
•Euroblock
•Pin arrangement: “+” Hot/“–” Cold/“G” GND
⑰Analog output (unbalanced) terminals: OUTPUT1
(UNBAL)
•Euroblock
•Pin arrangement: “SIG” Signal (2 systems)/“G” GND
⑱Analog input (unbalanced) terminals: INPUT (AUX)
•RCA
⑲Analog 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 29)
⑳Analog input (balanced) terminal:
INPUT(INTERPRETATION RETURN 1-2)
•Euroblock
•Pin arrangement: “+” Hot/“–” Cold/“G” GND
•Inputs audio signals from simultaneous interpretation system
㉑Ground 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.
㉒AC 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.

9
ATUC-50DU
②
③
④
①
⑤
⑦
⑥
①DU display
When changing monitor channel or adjusting the volume level,
the currently set value is displayed.
②Microphone release lever
③Microphone jack
Connect a microphone.
•A typical 3-pin XLR type microphone as well as the ATUC-M
series microphone can be connected.
④</> Monitor channel selection buttons
When operating the </> monitor channel selection buttons, the
currently selected monitor channel is displayed on the DU
display ①.
FL: Monitors floor channel audio.
01-03: Monitors the audio of channels 1 to 3.
–/+ Headphone volume adjustment buttons
When operating the –/+ headphone adjustment buttons, the
current volume level (0 to 20) is displayed on the DU display.
⑤Built-in speaker
Outputs conference audio.
⑥(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 31).
⑦(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.

10
⑧
⑩ ⑪
⑨
⑬
⑫
⑧Headphone jack
⑨Rear 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 31).
⑩Extension terminal
⑪DU/CU connection terminals (
󴀍
page 13)
⑫Bottom cover
Covering the terminal part protects the terminals from dust and
also prevents cables from becoming unplugged. Therefore, after
connecting cables to each terminal, be sure to attach the bottom
cover.
⑬Serial number
ATUC-M
③
①
②
①Microphone
②Ring LED
Lights red when the microphone is activated.
Blinks red while waiting to talk.
③Connector

11
Changing settings from ATUC-50CU
You can change CU settings by selecting “Set” on the HOME screen
of the CU display. Changeable items are as follows.
For more detailed settings and settings of each DU, use Web
Remote.
•After changing the network setting item(s), restart the
CU to enable the setting values.
Set Menu Items
[1] System Setting (
󴀍
page
25)
01 Device Name ATUC-50CU
02 Link Port Set CU A/B, DU C/D
03 CU Link Mode Primary, Extension 1, Extension 2
04 IP Setting
01 IP Config Mode Auto, Static
02 IP Address 0.0.0.0 - 255.255.255.255
03 Subnet Mask 0.0.0.0 - 255.255.255.255
04 Gateway Address 0.0.0.0 - 255.255.255.255
05 Allow Discovery On, Off
06 IP Ctrl Setting
01 IP Ctrl Port No 00001 - 65535
02 IP Ctrl Ntfy On, Off
03 Audio Level Ntfy On, Off
04 M-cast Adrs 0.0.0.0 - 255.255.255.255
05 M-cast Port No 00001 - 65535
07 Auto Mode Change
01 Auto Mode Change On, Off
02 Hold Time(Err) 20, 30, 40 seconds
08 NTP Setting
01 NTP On, Off
02 NTP Adrs 0.0.0.0 - 255.255.255.255
03 NTP Port 00001 - 65535
04 Time Zone UTC –12:00 to +14:00
05 DST On, Off
06 DST Start Date 1/1 - 12/31
07 DST Start Time 0:00 - 23:00
08 DST End Date 1/1 - 12/31
09 DST End Time 0:00 - 23:00
09 Login Password
01 Admin.Pwd.Login On, Off
02 Admin.Password Displays password
03 Opr.Pwd.Login On, Off
04 Opr.Password Displays password
10 Reset All Dflt.
[2] System Info (
󴀍
page
37) Displays current settings
01 Name
02 Serial Number
03 FW Version
04 IP Config Mode
05 IP Address
06 Subnet Mask
07 Gateway Address
08 Mac Address
09 Allow Discovery
10 IP Ctrl Port No
11 IP Ctrl Ntfy
12 Audio Level Ntfy
13 M-cast Adrs
14 M-cast Port No
15 NTP
16 NTP Adrs
17 NTP Port
18 Time Zone
19 CU Link Status
20 No.ofExtensionCU
21 Total No.of DU
[3] Audio Setting (
󴀍
page
29)
01 MIC/LINE Input 1
01 Input Type Mic, Line +4dBu, Line 0dBV
02 Input Gain –60dB to –16dB
03 Level –∞, –120 to +10dB
04 Phantom Power On, Off
05 Mix to Floor On, Off
02 MIC/LINE Input 2
01 Input Type Mic, Line +4dBu, Line 0dBV
02 Input Gain –60dB to –16dB
03 Level –∞, –120 to +10dB
04 Phantom Power On, Off
05 Mix to Floor On, Off
03 AUX Input
01 Level –∞, –120 to +10dB
02 Mix to Floor On, Off
04 DU SP Output Lvl 0- 20
05 VoiceDetectSens –5, –4, –3, –2, –1, 0, 1, 2, 3, 4, 5,
Auto by Mic2 In
[4] Recorder Setting
(
󴀍
page 35)
01 Rec Format WAV, MP3
02 RecordingQuality 64, 128, 192, 256, 320kbps
03 No.of Rec CH 1to 4(WAV), 1to 2(MP3)
04 Rec Source CH1
Floor, Group 0, Group 1,
Group2, Group 3, Language 1,
Language 2, Language 3, SubMix
1, Sub Mix 2
05 Rec Source CH2
Floor, Group 0, Group 1,
Group2, Group 3, Language 1,
Language 2, Language 3, SubMix
1, Sub Mix 2
06 Rec Source CH3
Floor, Group 0, Group 1,
Group2, Group 3, Language 1,
Language 2, Language 3, SubMix
1, Sub Mix 2
07 Rec Source CH4
Floor, Group 0, Group 1,
Group2, Group 3, Language 1,
Language 2, Language 3, SubMix
1, Sub Mix 2
08 Auto Track Off, 15, 30 min, 1, 2 hour
09 Filename Prefix Displays filename prefix
[5] Conference Mode
(
󴀍
page 34)
01 Conference Mode Free Talk, Request Talk, Full
Remote
02 NOM 1to 10
03 Auto Mic Off 5to 60sec ,Off
04 Override Mode
No Override, FIFO, LIFO
(depending on Conference
Mode)
05 Max Queue 0-150
06 MicON Trigger All Button, All Voice, Individual
07 MicON Hold Time 1.0 to 10.0 seconds
08 Interrupt Option Cut, Mute
[6] Logging (
󴀍
page 37)
01 Logging On, Off
02 Destination Internal, USB
[7] Presets (
󴀍
page 37)
01 Recall Presets Recalls presets
02 Save Presets Saves presets
03 Import Presets Imports presets
04 Export Presets Exports presets

12
Entering letters
For example, when entering letters from [4]
Recorder Setting
→
09Filename Prefix
, follow the procedure below.
1Rotate the jog dial to select a letter.
You can use the following characters.
(1)
Password
A to Z, a to z, 1 to 9, 0
(2)
Device Name
A to Z, a to z, 1 to 9, 0, ! “ # $ % & ‘ ( ) * + ,- . / : ; < = > ? @ `,
(space)
(3)
Filename Prefix
A to Z, a to z, 1 to 9, 0, ! # $ % & ‘ ( ) + ,- . ; = ? @ `, (space)
2Press the ENTER button to enter the selected
letter.
The cursor moves to the right.
3Repeat steps 1 and 2 to enter desired text.
To delete characters you have just entered, follow the procedure
below.
•To move the cursor to the character you want to edit:
(1) While pressing and holding the BACK button, rotate the
jog dial to move the cursor.
(2) Release the BACK button.
•To delete characters you have just entered:
(1) Move the cursor to the character you want to delete.
(2) While pressing and holding the BACK button, press the
ENTER button.
The character at the current cursor position will be
deleted.
•When the cursor flashes in “_” state at the end of the
text, the character just before the cursor will be deleted.
•To change characters you have just entered:
(1) Move the cursor to the character you want to edit.
(2) Rotate the jog dial to select the desired character.
•To finish editing:
(1) When the cursor is in “■” blinking state, press the
ENTER button.
When editing ends, the cursor will move to the end of the
text and “_” will blink.
4To enter the text, when the cursor is in the “_”
blinking state, press the ENTER button.
Displays
Completed!
followed by the file name.

13
System Connections and Configuration
Connecting devices
NOTICE •Do not plug in the supplied AC power cord until all other
connections have been completed.
•Insert the plugs all the way in. Loose connections may
cause malfunctions or noise.
•Check the plug orientations.
•Refer also to the instruction manuals supplied with the
external devices.
Entire system connection diagram (1)
Refer also to the entire system connection diagram (2) (
󴀍
page
19)
4
3
2
1
1
1
5
Speaker
Amplifier
NOTICE •Use CAT5e or higher straight cables. (Shielded cables
with conductor size of 24AWG or higher in diameter are
recommended.)
•Using flat type cables or unshielded cables may cause
noise and affect other devices.
•Be sure to establish a ground connection.
When securing a DU to a desk or table, use the screw holes (3holes)
on the bottom side of the DU (screw: M3, P=0.5, within 6mm from
the bottom side to the tip of the screw).
30
95
(103.5)
87
45
1Connecting the DUs to the CU
1Place the CU(s) and DUs.
NOTICE •Place the units on a flat surface or install in a rack.
Dropping a unit may cause damage to the unit and/or
personal injury.
•When installing the CU in a rack, read the precautions in
advance (
󴀍
page 3).
2Connect the DU(s) to the DU CHAIN A/B
terminal(s).
Ethernetcable

14
•You can configure the CU LINK A/B terminals as DU
CHAIN C/D terminals, and you can also connect DUs in
the same manner as the DU CHAIN A/B terminals.
However, the maximum number of DUs you can connect
to the DU CHAIN C/D terminals is 25 in total. (Note
that the maximum number of DUs you can connect to
each CU is 50) (
󴀍
page 15).
•Remove the DU bottom cover to connect the Ethernet
cables. When removing the bottom cover, pinch together
the latches on both sides.
•On the DU, the Ethernet cable may be connected to the
left or right DU/CU connection terminal because the
DU does not distinguish between DU and CU
connection terminals.
2Connecting the DUs together
Ethernet cable Ethernet cable
To ATUC-50CU
1Connect the DUs according to the installation
environment and operation method.
Daisy-chain connection:
Connect the DUs in a series to the DU CHAIN A/B (C/D)
terminals. Compared to ring connection, daisy-chain connection
enables the DUs to be placed even farther from the CU.
End of the chain End of the chain
If a connection failure occurs
here, the connection to the end
of the chain will be defunct.
Ring connection:
Connect as many DUs as necessary to each of the DU CHAIN
A/B terminals and then connect together the 2 DUs on both
ends of the chain so as to form a ring. Even if a connection
failure occurs somewhere in the ring, since the connection is
recognized as 2 daisy-chains using the DU CHAIN A/B
terminals, the influence of the failure can be minimized and you
can carry on conference control.
Even if a connection failure
occurs, since the connection is
recognized as 2 daisy-chains
using the DU CHAIN A/B
terminals, you can carry on
conference control.
One more ring connection can
be made by configuring these
terminals as the DU CHAIN
terminals.
•Combining different connection types is also possible,
such as a ring connection using the DU CHAIN A/B
terminals and daisy-chain connections using the DU
CHAIN C/D terminals.
Daisy-chain connection Ring connection
NOTICE •Regardless of the number of DU terminals you use, the
maximum number of DUs that can be connected to each
CU is 50.
•Up to 25 DUs can be connected to the DU CHAIN C/D
terminals in total. Do not connect 26 or more DUs.
Doing so may damage the units.

15
Relationship between Ethernet cable length and the number of connectable units:
DU-DU CU-DU
1 port daisy-chain/1 ring connection 2 port daisy-chain connection
Number of
connectable DUs
Ethernet cable
total length
Number of
connectable DUs
Ethernet cable
total length
1.5m 10m 45Units 76.0m
1.5m 30m 40Units 88.5m
1.5m 50m 36Units 102.5m
1.5m 100m 24Units 134.5m
2.0m 10m 43Units 94.0m
2.0m 30m 39Units 106.0m
2.0m 50m 34Units 116.0m
2.0m 100m 24Units 146.0m
3.0m 10m 40Units 127.0m 25 × 2Unit 82.0m × 2
3.0m 30m 36Units 135.0m 24 × 2Unit 99.0m × 2
3.0m 50m 31Units 140.0m 23 × 2Unit 116.0m × 2
3.0m 100m 22Units 163.0m 20 × 2Unit 157.0m × 2
5.0m 10m 33Units 170.0m 24 × 2Unit 125.0m × 2
5.0m 30m 29Units 170.0m 23 × 2Unit 140.0m × 2
5.0m 50m 27Units 180.0m 22 × 2Unit 155.0m × 2
5.0m 100m 20Units 195.0m 19 × 2Unit 190.0m × 2
DU-DU CU-DU
4 port daisy-chain connection 2 ring connections
Number of
connectable DUs
Ethernet cable
total length
Number of
connectable DUs
Ethernet cable
total length
1.5m 10m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 31m × 2
C/D: 23.5m × 2
A-B: 25Units
C-D: 25Units
A-B: 46m
C-D: 46m
1.5m 30m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 51m × 2
C/D: 43.5m × 2
A-B: 25Units
C-D: 25Units
A-B: 66m
C-D: 66m
1.5m 50m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 71m × 2
C/D: 63.5m × 2
A-B: 23Units
C-D: 23Units
A-B: 83m
C-D: 83m
1.5m 100m A/B: 14 × 2Units
C/D: 10 × 2Units
A/B: 119.5m × 2
C/D: 113.5m × 2
A-B: 20Units
C-D: 20Units
A-B: 128.5m
C-D: 128.5m
2.0m 10m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 38m × 2
C/D: 28m × 2
A-B: 25Units
C-D: 25Units
A-B: 58m
C-D: 58m
2.0m 30m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 58m × 2
C/D: 48m × 2
A-B: 25Units
C-D: 24Units
A-B: 78m
C-D: 76m
2.0m 50m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 78m × 2
C/D: 68m × 2
A-B: 23Units
C-D: 23Units
A-B: 94m
C-D: 94m
2.0m 100m A/B: 14 × 2Units
C/D: 10 × 2Units
A/B: 126m × 2
C/D: 118m × 2
A-B: 20Units
C-D: 20Units
A-B: 138m
C-D: 138m
3.0m 10m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 52m × 2
C/D: 37m × 2
A-B: 25Units
C-D: 25Units
A-B: 82m
C-D: 82m
3.0m 30m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 72m × 2
C/D: 57m × 2
A-B: 24Units
C-D: 24Units
A-B: 99m
C-D: 99m
3.0m 50m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 92m × 2
C/D: 77m × 2
A-B: 23Units
C-D: 22Units
A-B: 116m
C-D: 113m
3.0m 100m A/B: 14 × 2Units
C/D: 10 × 2Units
A/B: 139m × 2
C/D: 127m × 2
A-B: 20Units
C-D: 19Units
A-B: 157m
C-D: 154m
5.0m 10m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 80m × 2
C/D: 55m × 2
A-B: 24Units
C-D: 24Units
A-B: 125m
C-D: 125m
5.0m 30m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 100m × 2
C/D: 75m × 2
A-B: 23Units
C-D: 23Units
A-B: 140m
C-D: 140m

16
DU-DU CU-DU
4 port daisy-chain connection 2 ring connections
Number of
connectable DUs
Ethernet cable
total length
Number of
connectable DUs
Ethernet cable
total length
5.0m 50m A/B: 15 × 2Units
C/D: 10 × 2Units
A/B: 120m × 2
C/D: 95m × 2
A-B: 22Units
C-D: 22Units
A-B: 155m
C-D: 155m
5.0m 100m A/B: 14 × 2Units
C/D: 9 × 2Units
A/B: 165m × 2
C/D: 140m × 2
A-B: 19Units
C-D: 18Units
A-B: 190m
C-D: 185m
The values in the tables above are calculated based on the following assumptions.
•The number of connectable DUs and total cable length are calculated based on the assumption that the ATUC-M is connected to each DU.
•Use CAT5e or higher cables. (A shielded cable with conductor size of 24AWG or higher in diameter is recommended.)
•1-port daisy-chain/1 ring connection: Daisy-chain DUs to either the DU CHAIN A or Bterminal or make a ring connection using the DU
CHAIN A-B terminals.
•2-port daisy-chain connection: Daisy-chain the same number of DUs to the DU CHAIN A and Bterminals.
•4-port daisy-chain connection: Daisy-chain the same number of DUs to the DU CHAIN A and Bterminals and daisy-chain the same
number of DUs to the DU CHAIN C and Dterminals.
•2-ring connections: Make one ring connection using the DU CHAIN A-B terminals and make the other ring connection using the DU
CHAIN C-D terminals.
•When making a ring connection with the DU CHAIN A-B terminals, the relationship between Ethernet cable length and number of
connectable DUs is the same as that of 1-port daisy-chain connection.
•When you need more distance between the DUs, the 2-port daisy-chain connection allows you to connect more DUs than the 1-port
daisy-chain connection.
NOTICE •When connecting DUs, never exceed the number of connectable DUs and the connectable length (total length and distance
between each unit). This may cause a malfunction.
•You can also connect the DUs to the CU LINK terminals by configuring as DU CHAIN C/D terminals. However, if the number
of the DUs connected to the DU CHAIN A/B terminals have not reached the maximum, be sure to connect DUs to the DU
CHAIN A/B terminals.
•Up to 25 DUs can be connected to the DU CHAIN C/D terminals in total. Connecting 26 or more DUs may damage the units.
•The combinations shown above are representative examples. For other combinations, please inquire with our sales representative.

17
CU Link connection:
Up to 3 CUs can be cascaded (cascade CUs using the CU LINK
A/B terminals as shown below). Set one of the CUs as the
primary unit.
Since up to 50 DUs can be connected to each CU, if you use 3
CUs, up to 150 DUs can be connected in total.
Follow the procedure below to cascade CUs.
①Connect the CU LINK A terminal on the 1st extension CU to
the CU LINK B terminal on the primary CU.
②When cascading 2 extension CUs, connect the CU LINK A
terminal on the 2nd extension CU to the CU LINK B terminal
on the 1st extension CU.
up to 50 units
up to 50 units
up to 50 units
Primary CU
1st extension
CU
Terminal Ais
not used.
①
②
2nd extension
CU
Primary/Extension (
CU Link Mode
):
Primary CU 1st extension
CU
2nd extension
CU
2-CU Link [Primary] [Extension 2] -
3-CU Link [Primary] [Extension 1] [Extension 2]
•You can either daisy-chain (
󴀍
page 14) or ring (
󴀍
page
14) DUs to each CU.
NOTICE •When using only one CU without a CU Link connection,
be sure to set [CU Link Setting] to [Primary]. If [CU
Link Setting] is set to [Extension], we do not assume
responsibility for any unexpected consequences that may
occur.
2Attach the bottom cover to the DU.
After connecting the Ethernet cables to the DUs, attach the
bottom cover to each DU.
•The Ethernet cable is fixed securely between the DU and the
bottom cover. This helps reduce the weight of the DU which
bears on the Ethernet cables.
•To lead the cable out to the rear side, use the through hole ①.
To lead the cable out to the bottom side, use the through holes
②.
②
①
Bottom cover
3Attach the optional bottom weight to the DUs.
•When using DUs that are not secured to desktops or
tabletops, it is recommended to use the optional bottom
weight (330g) for secure placement.
•To purchase the optional accessories, contact our sales
team.

18
3Connecting the microphone ATUC‑M
to the DU
1Connect the ATUC‑M to the microphone jack on
the DU.
ATUC-M
ATUC-50DU
NOTICE •Insert the ATUC-M connector in until you hear a
clicking sound.
•Do not attempt to lift up the DU by grabbing onto the
ATUC-M. Be sure to hold the main body of the DU when
lifting it up.
•Slowly bend or extend the flexible part of the ATUC-M.
Do not apply excessive force to the ATUC-M when
bending it.
•When disconnecting the ATUC-M from the DU, securely
hold the connector while pressing down the microphone
release lever and then remove the ATUC-M.
•Before connecting/disconnecting the ATUC-M, be sure
to turn off the power. If you do not turn off the power,
malfunction may occur.
4Connecting an amplifier
1Connect an amplifier to the OUTPUT BAL.
terminal.
Connect an amplifier to amplify sound.
Connect a speaker via the amplifier.
OUTPUT BAL. terminal
Amplifier Speaker
NOTICE •When connecting external devices, refer also to the
instruction manuals supplied with them.
5Turning on the CU and testing DU
operations
After checking that all the connections from steps 1to 4have
been done properly, follow the procedure below to turn on the
power of the CU.
1Check that all the PA devices such as an amplifier
and mixer are off.
2Connect the supplied AC power cord to the CU.
NOTICE •Be sure to use the supplied AC power cord. Using an AC
power cord other than the supplied one may cause
problems such as damage to the CU, which can be very
dangerous.
•Be sure to connect the AC power cord into a properly
grounded wall outlet. Improper grounding can cause
electrical shock.
•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
3Press the power button.
NOTICE •When one or two extension CUs are connected to the
system, turn on the power of the primary CU and
extension CU(s) at the same time. If the time period
between each power-on time is significantly long, a
successful CU Link may not be established.
•Configure the network setting from the CU (
󴀍
page
11) as necessary.

19
4After the CU starts up, press the (talk) button of
each DU to confirm operation.
NOTICE •When the DUs are placed close to each other, excessively
raising the volume of the DU speakers may cause
howling. In such a case, move the DUs farther away from
each other or decrease the volume.
5After checking that the DUs are operating, turn
off the CU before proceeding to the next step for
connecting the CU to a network device.
NOTICE •If the power of the amplifier is on, first turn off the
power of the amplifier.
Entire system connection diagram (2)
Web Remote
Control
6
7
7
5
Web Remote
Control
Tablet
AP
Router
Switching hub
Computer
6Connecting to a network
Configure the detailed conference system settings via Web Remote
by connecting the CU to a network (
󴀍
page 21).
1Use an Ethernet cable to connect the CU to a
switching hub via the NETWORK terminal.
NOTICE •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.
Switching hub
NETWORK
terminal
Ethernet cable
7Connecting a computer or mobile
device to a network
About network settings
•If there is a DHCP server running on the network, the CU
automatically configures network settings including the IP
address.
•If there is no DHCP server running on the network, manually
configure network settings including the IP address from the Set
Menu →
System Setting
(
󴀍
page 7).
•When configuring settings manually, inquire with the network
manager regarding setting items.
NOTICE •We decline any and all responsibility for communication
errors and failures regarding your network environment
and external devices.
•Disable the firewall setting on your computer. Otherwise,
“Locate” will not recognize the CU.
Switching hub
NETWORK
terminal
Computer
AP
Mobile device
Ethernet cable

20
To connect the CU directly to the your Windows PC/Mac
using an Ethernet cable
If your computer is equipped with an NIC (Network Interface
Card), you can also connect the CU directly to the computer using
an Ethernet cable.
NOTICE •Be careful NOT to connect the Ethernet cable from the
computer to the CU LINK terminal or DU CHAIN
terminal. This can cause damage to the computer.
1Connect an Ethernet cable (straight) to the
NETWORK terminal on the CU and Ethernet
terminal on a computer.
2In the network settings on your Windows PC/Mac,
select “Obtain an IP address automatically” on
your Windows PC, or “Using DHCP” on your Mac,
and then save the settings.
3Start up the CU and from the Set Menu →
System
Info
→
IP Config Mode
, select
Auto
(
󴀍
page
7).
4Press the BACK button to close the Set Menu.
•After changing the network setting item(s), restart the
CU to enable the setting values.
Since there is no DHCP server, an IP address is automatically
assigned to the Windows PC/Mac and the CU using the APIPA
(Automatic Private IP Addressing) feature.