HME DX121 EU User manual

HME# 400G762
Rev. A 5/4/17
DX121 EU
One-to-One Wireless Intercom System
Operating Instructions

Illustrations in this publication are approximate representations of the actual equipment, and
may not be exactly as the equipment appears.
HM Electronics, Inc. is not responsible for equipment malfunctions due to erroneous translation
of its publications from their original English version.
Table of Contents
SECTION 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Typical DX121 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Equipment Identication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Main Equipment Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SECTION 2. BASE STATION SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Basic Base Station Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
AC50 Battery Charger Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
AC40 Battery Charger Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Multiple Base Station Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Beltpac / All-In-One Headset Setup and Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Set Up All-In-One Headsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Intercom and Relay Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SECTION 3. EQUIPMENT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Base Station Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Beltpac Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
All-In-One Headset Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SECTION 4. EU BASE STATION ADAPTIVE FREQUENCY HOPPING . . . . . . . . . . . . . . . . . . . . . . . . . 23
CE Base Station Adaptive Frequency Hopping - Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
CLEAR-COM Adaptive Frequency Hopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Operation in Severe Environments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Required AFH Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Non-AFH Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Interference Mitigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SECTION 5. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
SECTION 6. DX SERIES LED AID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Syncing Secondary to Primary Bases Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SECTION 7. TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DX121 Equipment Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SECTION 8. INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
BASE STATION BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
GENERAL BATTERY SAFETY INSTRUCTIONS FOR BATTERY MODEL BAT41, BAT50, BAT60 . . . . . . . . . . 32
Directives de sécurité générales pour les modèles de batterie suivants : BAT41, BAT50, BAT60. . . . . . . . . . 33
Instrucciones generales de seguridad para baterías para cada modelo de batería: BAT41, BAT50, BAT60 . . . . 34
배터리 모델의 일반적인 배터리 안전 지침: BAT41, BAT50, BAT60 . . . . . . . . . . . . . . . . . . . . . . . . . 35
© 2017 HM Electronics, Inc.
The HME logo and product names are registered trademarks of HM Electronics. All rights reserved.

Hereby, HM Electronics, Inc. declares that the DX121 is in compliance with the essential requirements and other relevant provisions of the Radio
Equipment Directive (RED).
is product operates in the 2400 to 2483.5 MHz frequency range. e use of this frequency range is not yet harmonized between all countries. Some
countries may restrict the use of a portion of this band or impose other restriction relating to power level or use. You should contact your Spectrum
authority to determine possible restrictions. European Telecommunications Standards Institute (ETSI) EN 300 328 v.1.8.1 compliant, when operated
in the E mode.
FCC NOTICE
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may
cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC
rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communication. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case the user will be required to correct the interference at his own expense.
Changes or modications not expressly approved by HM Electronics, Inc. could void the users authority to operate this equipment.
Canada IC Notice to Users English/French in accordance with RSS GEN
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device
may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the
device.
Cet appareil est conforme avec Industrie Canada RSS standard exempts de licence (s). Son utilization est soumise à Les deux conditions suivantes:
(1) cet appareil ne peut pas provoquer d’interférences et (2) cet appareil doit accepter Toute interférence, y compris les interférences qui peuvent
causer un mauvais fonctionnement du dispositif.
MANDATORY SAFETY INSTRUCTIONS FOR INSTALLERS AND USERS
Use only manufacturer or dealer supplied antennas, power supplies, batteries and battery chargers.
All products are compliant with regulatory requirements when installed correctly per HME installation instructions..
The Federal Communications Commission has adopted a safety standard for human exposure to RF (Radio Frequency) energy, which is below the
OSHA (Occupational Safety and Health Act) limits.
Base Station Antenna minimum safe distance: 7.9 inches (20 cm) at 100% duty cycle.
Base Station Antenna gain: This device has been designed to operate with an antenna having a maximum gain of up to 2dBi. The required
antenna impedance is 50 Ohms.
Antenna mounting: The antenna(s) used for the base transmitter must be installed to provide a separation distance of at least 7.9 inches (20 cm)
from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.
Antenna substitution: Do not substitute any antenna for the one supplied by the manufacturer or radio dealer. You may be exposing person or
persons to excess radio frequency radiation. You may contact your radio dealer or the manufacturer for further instructions.
WARNING: Maintain a separation distance from the base station transmit antenna to a person(s) of at least 7.9 inches (20 cm) at 100% duty
cycle.
You, as the qualied end-user of this radio device must control the exposure conditions of bystanders to ensure the minimum separation distance
(above) is maintained between the antenna and nearby persons for satisfying RF exposure compliance. The operation of this transmitter must
satisfy the requirements of Occupational/Controlled Exposure Environment, for work-related use. Transmit only when person(s) are at least the
minimum distance from the properly installed, externally mounted antenna.

WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
The European Union (EU) WEEE Directive 2012/19/EU places an obligation on producers (manufacturers, distributors
and/or retailers) to take-back electronic products at the end of their useful life. The WEEE Directive covers most HME
products being sold into the EU as of August 13, 2005. Manufacturers, distributors and retailers are obliged to nance
the costs of recovery from municipal collection points, reuse, and recycling of specied percentages per the WEEE
requirements.
Instructions for Disposal of WEEE by Users in the European Union
The symbol shown below is on the product or on its packaging which indicates that this product was put on the market
after August 13, 2005 and must not be disposed of with other waste. Instead, it is the user’s responsibility to dispose of
the user’s waste equipment by handing it over to a designated collection point for the recycling of WEEE. The separate
collection and recycling of waste equipment at the time of disposal will help to conserve natural resources and ensure that
it is recycled in a manner that protects human health and the environment. For more information about where you can
drop off your waste equipment for recycling, please contact your local authority, your household waste disposal service or
the seller from whom you purchased the product.
Clear-Com, LLC, an HM Electronics, Inc. company, is not responsible for equipment malfunctions due to erroneous
translation of its publications from their original English version. Illustrations in this publication are approximate
representations of the actual equipment, and may not be exactly as the equipment appears.
Korea KCC EMC Class A Warning
A급기기(업무용방송통신기자재)
이 기기는 업무용 환경에서 사용할 목적으로
적합성 평가를 받은 기기로서 가정용 환경에서
사용하는 경우 전파 간섭의 우려가 있습니다.
English: Class A (Commercial broadcasting and communication equipment) Sellers and user should note that this
equipment is an electromagnetic device for business (Class A) and intended for operation in non-residential locations.
Korea KCC 2.4Ghz device warning
해당 무선설비는 전파혼신 가능성이 있으므로 인명안전과 관련된 서비스는 할 수 없음
English: This device cannot provide services related to human life safety.

1
DX121 Quick Reference Guide
Base Station
Power
¾Connect power ― See page 7
¾Press POWER button to turn base station on/off ― Red light above button indicates power on
¾BATT PWR light (not used in this product)
Beltpac and
Headset
Registration
¾Insert a charged battery
¾Press REG button on the base station to enter registration mode ― See page 13
¾Hold down ISO button while you press and release POWER button on the headset or beltpac
IC/ISO
Indicators ¾Green lights indicate IC or ISO communication is being received
Headset / 4-Wire
Audio Level ¾Adjust INbound/OUTbound headset and 4-Wire equipment audio levels using small screwdriver
Battery Charger
¾Place battery in port for charging
¾Red CHG light indicates battery is charging
¾Green RDY light indicates fully-charged battery is ready
Hands Free (HF) Push-To-Talk (PTT) ISO Lockout
Mode
Setup
¾Power OFF
¾Press/hold and while
you press/release
¾Release and
¾Power OFF
¾Press/hold and while
you press/release
¾Release and
¾Power OFF
¾Press/hold while you
press/release
To reset ISO ―
¾Press/hold and while
you press/release
Operation
¾Press and release or
quickly to latch into mode to
talk to other users
¾Press/release again to
unlatch and listen
¾Press and hold or
while talking to other users
¾Release to listen
¾Use either or to talk
to other users in HF or PTT
¾will not operate relay
Change Battery
If you hear “Change battery” ―
¾Remove battery from beltpac
¾Place battery in battery-charger port
for recharging
¾Install fully charged battery in beltpac
For detailed information on DX121 features, and for setup and operating instructions, continue reading the following pages.
BeltpacHeadset

2
SECTION 1. INTRODUCTION
The DX121 is a 2.4 GHz Wireless Intercom System. The Base Station will connect to a dynamic microphone headset jack or the
4-Wire connector of a hardwired intercom station. It also provides battery-charging capability for one battery. The system typically
uses BP200 Beltpacs, but it can also be used with the WH220 All-in-One Headset. Once connected to your system, you can leave
your console or intercom station while using a beltpac or headset.
¾Each Base Station supports one beltpac or headset in full duplex, hands-free operation.
¾Each Base Station supports up to four registered beltpac or headset.
¾Compatible with RTS and ClearCom/Production Intercom wired intercom headset or 4-Wire capable equipment.
NOTE: Use only with headset connectors capable of supporting dynamic microphone headsets.
¾In the default mode, the ISO button activates relay-controlled contacts. For alternate operating mode, see Relay Operation
on page 16.
¾The IC button activates audio to the 4-Wire and headset Input/Output connector(s).
¾The ISO and IC buttons activate audio to other registered beltpacs and headsets.
¾The Base Station can charge a BAT41 battery in less than 3 hours.
Typical DX121 Applications
Large Venue

3
Radio Communication Center
Broadcasting
Theater

4
Equipment Identication
The DX121 One-to-One Wireless Intercom System includes a base station and may include any combination of beltpacs and headsets.
Other optional equipment may also be used with your system. As you unpack the equipment, check the enclosed shipping document to
be sure you received all items listed.
Base Station
BS121 Base Station Base Station Antennas
(2 per Base Station)
115/230 Volt AC Power Supply
(1 per Base Station, with Power Cord)
Beltpac and Headset
CC-15-MD4 Headset Beltpac Pouch
BP200 Beltpac
WH220 All-in-One
Wireless Headset
Battery (BAT41)
Two per Beltpac or All-in-One Headset
Battery (BAT50)
Two per Beltpac or All-in-One Headset
OPTIONAL EQUIPMENT
• BP200 Beltpac • HSI6000 Headset Adapter
• CC-15-MD4 Single-Muff Headset • WH220 All-in-One Headset
• CC-15-MD4 Dual-Muff Headset • BAT41 Rechargeable Battery
• HS16 Lightweight Headset • BAT50, BAT41 Rechargeable Battery
• HS4-3 Earpiece & Lapel Microphone • AC50, AC40 Battery Charger
AC50 Battery Charger
NOTE: If you’re using a
WH220 with the MB121,
you will need to purchase
AC50 battery charger.
AC40 Battery Charger

5
Main Equipment Features
Base Station Features
Front Panel
Rear Panel
1. POWER button
2. POWER light
3. BATT PWR light (not used)
4. STATUS display
5. CLR/BND (clear/band) button
6. REG (registration) button
7. RESET button (recessed)
8. IC indicator light
9. ISO indicator light
10. HEADSET and 4W (4-Wire) IN and OUT
audio level controls
11. Battery charger port (BAT41 battery only)
12. RDY (battery ready) light
13. CHG (battery charging) light
14. Antenna connector
15. 12-14 VDC power supply connector
16. Antenna connector
17. HEADSET / 4-WIRE connector block
18. PRI SEC (primary/secondary) switch
19. RELAY connector block

6
Beltpac Features (Uses BAT41 Battery)
WH220 Headset Features (Uses BAT50 Battery)
1. Headset cable connector
2. Beltpac power and transmit lights
3. ISO (Isolate) button
4. IC (Intercom) button
5. PWR (Power) button
6. Volume-up button
7. Volume-down button
8. Battery
9. Battery release latch
1. IC1 button
2. ISO (Isolate) button
3. Volume-up button
4. IC2 button
5. Volume-down button
6. Power/mode light
7. Microphone
8. Power button
9. Battery
10. Battery-release latch

7
SECTION 2. BASE STATION SETUP
Basic Base Station Setup
The following description is for a basic, stand-alone DX121 One-to-One Wireless Intercom System setup. Intercom headset,
4-Wire intercom and relay connections are described on page 17.
Set up the Base Station as follows:
1. Mount antennas -
Mount the two enclosed antennas on the antenna connectors on the rear panel of the Base Station. Position the antennas at an
approximate 90° angle. Turn the sleeve on each of the antenna connectors clockwise to tighten it securely in place.
Approximate
90° angle
12-14 VDC power connector
Antenna connectors
Rear Panel
2. Connect power -
¾Plug the connector at the end of the AC power supply cord into the 12-14VDC power connector on the rear panel of the
Base Station, and turn the nut on the connector clockwise to secure it to the Base Station.
¾Plug the female connector at one end of the power cord into the AC power supply, and plug the other end into an electrical
outlet.
¾Press the POWER button on the front of the Base Station to turn it on. The red light above the button should turn on.
Power supply
connector
Base Station rear panel
AC power supply Power cord
To electrical outletPower cord connector
Power light
Power button Front Panel

8
3. Charge batteries -
IMPORTANT! – Before using the DX121 system, charge the batteries for the Beltpacs and/or WH220 Headsets. Charging time
for fully-discharged batteries is about 3 hours per battery.
¾One battery can be charged in the battery
charger at a time.
¾Insert a battery in the charging port until it
clicks in place.
¾A red charging CHG light above the battery
port stays on while a battery in the port is
charging.
¾A green ready RDY light above the battery
port goes on when a battery in the port is
fully charged.
Red battery- charging light
Green battery- ready light
Battery
AC50 Battery Charger Setup
The AC50 is the charger for All-in-One headsets.
Before installing the system, connect the AC power supply to the battery charger
and plug it into an electrical outlet. Charge all the batteries while the other
equipment is being installed. Charging time is about 2.5 hours.
Connect AC Power Supply
To connect the AC power supply to the battery charger:
¾Connect the AC power supply cable connector to the power connection
on the battery charger.
¾Connect the AC power cord to an electrical outlet.
The red lights on the charger will briey display, and then the yellow lights will
appear and remain on.
Charging the Batteries
Up to four batteries can be charged in the battery charger at one time. The battery status lights next to each charging port indicate
the battery status. Up to four fully charged batteries can be stored in the battery Storage ports. Insert a battery in each of four
Charging ports until it clicks in place.
¾A yellow light next to a Charging port indicates that the port is EMPTY.
¾A red light next indicates that the battery port is CHARGING.
¾A green light indicates that the battery is READY.
¾A steady yellow light indicates that the CHARGE
FAILED. If a charge fails, refer to the instructions
on the side of battery charger.
¾A ashing yellow light next indicates CHARGE
PENDING, which means the inserted battery is
too hot. Adjust the room temperature or move the
charger to a cooler area.
¾Store fully charged batteries in storage ports.
IMPORTANT: Batteries should not be left in charge ports
after being fully charged. A battery left in a charging
port for more than three weeks may display the yellow
indicator light, but it does not indicate a faulty battery.

9
AC40 Battery Charger Setup
The AC40 is the charger for Beltpac batteries
Before installing the system, connect the AC power supply to the AC40 Battery Charger and plug it into an electrical outlet.
Charge all the batteries for the Beltpacs while the other equipment is being installed. Charging time is about 2.5 hours.
Connect AC Power Supply
To connect the AC power supply to the battery charger:
¾Attach the AC power supply cable connector to the screw connector on the battery charger.
¾Plug the power cord connector into the AC power supply.
¾Plug the power cord into an electrical outlet.
The red lights on the charger will come on and go off, and then the yellow lights will turn on and remain on.
Charging the Batteries
Up to four batteries can be charged simultaneously. The
battery status lights next to each charging port are explained
below. Up to six fully charged batteries can be stored in the
battery storage ports.
¾Insert a battery in each of four charging ports until it
clicks in place.
¾A yellow light adjacent to each charging port
illuminates while the port is empty. When a battery
is in a charging port, an adjacent ashing yellow light
indicates CHARGE PENDING, which indicates that
the battery is too hot. Adjust the room temperature or
move the charger to a cooler area. When a battery
is in a charging port, an adjacent, steady yellow light
indicates CHARGE FAILED. If this happens, follow
the instructions on the side of battery charger.
¾A red light adjacent to a battery port indicates that
the battery in the port is CHARGING. A green light
adjacent to an inserted battery indicates a READY,
fully charged battery.
Store the fully charged batteries in storage ports.
Batteries should not be left in charge ports after being fully charged. A
yellow light may illuminate if a battery is left in a charge port for more
than three weeks. It does not indicate a faulty battery.
AC40 Battery Charger AC power supply
Power cord connector
Power cord
To electrical outlet
Power supply
cable connector
Charged batteries in
storage ports
Battery in
charging port
Empty
charging
ports

10
Multiple Base Station Setup
This mode of operation can be used to expand the number of users communicating through multiple HME Base Stations operating
in the same portion of the 2.4 GHz to 2.48 GHz frequency band.
Primary and Secondary Base Station Settings
One Base Station must be designated as “Primary” while the others are designated as “Secondary”. You can have only one
primary and up to 3 secondary Base Stations. Secondary Base Stations are assigned numbers 1, 2, or 3.
1. Label the Base Stations as Primary, 1, 2and 3.
2. Start with every Base Station and beltpac/headset powered off.
3. Locate the PRI SEC switch on the rear panel of the Base Station.
4. Set the PRI SEC switch to the PRI position on the primary Base Station.
5. Set the PRI SEC switch to the SEC position on each secondary Base Station.
6. If a Base Station has been set for interference avoidance, it should be used as the primary Base Station. The secondary
Base Stations will automatically be set to the same band when they are initialized.
Rear panel of Base Station
PRI SEC
switch

11
Base Station Initialization
For multiple HME Base Stations to operate without interference, they must be properly initialized before performing any other
setups. After initializing each Base Station, register each beltpac or headset that will be used with that base according to the
procedures on pages 13 – 16.
NOTE: Base stations must be set up for split-band operation prior to initialization.
1. Turn the primary Base Station power on. Register any beltpacs or headsets to be used with the primary Base Station (See
pages 13 – 16). Turn each beltpac or headset off after registering it.
2. Power on one secondary Base Station. The STATUS display will show a double bar, indicating the secondary base is
ready to be initialized.
Base Station ready to be initialized
Secondary 2 searching for primary Secondary is initialized to primary
3. Press the REG button on the primary base. The STATUS display will show a small “o”.
4. To assign a number to a secondary Base Station and then initialize it, repeatedly press the REG button on the secondary
base to cycle through the numbers 1, 2, and 3. When the desired number appears, stop pressing and wait.
5. While the secondary base initializes to the displayed number, the STATUS display will continue showing the secondary
number selected. When initialization of the secondary Base Station is nished, one bar is displayed that indicates that the
secondary has initialized to the primary.
6. Press the REG button on the primary. The STATUS display will go blank.
7. Register beltpacs or headsets to the secondary (see pages 13 – 16). After registration, turn off the secondary base and all
Beltpac and headsets.
Double bar
Secondary base number
Small “o” indicates primary
base is open for registration
Small “o”
One bar

12
Secondary base operating in primary
mode when no primary base is found
Three bars
NOTE: You cannot register beltpacs and headsets to a base that is set to primary mode, and then switch the base mode to
secondary for initialization. Once in secondary mode, the base cannot recognize the beltpacs and headsets registered during
primary operation. For secondary bases, the beltpacs and headsets must always be registered after secondary base initialization,
with the primary base remaining active and the secondary base displaying one bar.
8. Repeat these steps for each remaining secondary base. Use a different number for each. Only the primary base and the
secondary base you are working with should have power on during initialization. All other equipment should be off.
9. After all secondary bases are initialized with beltpacs and headsets registered, power up all bases.
10. Press RESET on the primary base, and let it recover. Turn on the primary beltpacs or headsets to allow them to link.
11. Press RESET on each secondary base (one at a time), and let it initialize to the primary (indicated by a single bar).
12. Turn on the beltpacs or headsets associated with the secondary bases. Complete one group at a time until they have all
linked, then move on the next group. At this point all bases and beltpacs or headsets should be powered up and linked,
ready for use.
13. Proceed with normal system conguration, setting functions and levels as required.
Replacing a Secondary Base
Use the procedure above to initialize the new secondary with the same number as the old secondary. After initialization you
will have to register any Beltpacs/Headsets associated with the old secondary to the new secondary.
Replacing a Primary Base
Follow the above procedure completely. Before initialization of the secondary bases, clear the previous secondary initialization
as follows:
For each secondary, press the CLR/BND button and the RESET button simultaneously. Continue holding the CLR/BND
button while releasing the RESET button until the clear code (“c”) appears on the STATUS display. Any beltpacs or headsets
associated with the old primary will have to be registered to the new primary after secondary base initialization. Also, all
beltpacs and headsets associated with secondary Base Stations must be registered again.
Primary Base is Shut Down or Powered Off for More than 30 Seconds
All secondary bases will drop their beltpac and headset connections and begin searching for the primary. If the primary is
not found in 30 seconds, the secondary will automatically revert to primary-mode operation and reconnect the beltpacs or
headsets.
At this point, the secondary STATUS displays will show three bars. If the primary powered on, it will be necessary to press
RESET on all secondary bases to allow them to nd and initialize to the primary again. It’s important to have all bases
connected to the same AC circuit to prevent this situation when the system is shut down after hours and powered up again the
next day.

13
Register Beltpacs
Beltpacs must be within 6 feet (1.83 meters) of the Base Station during registration. Before
you begin, be certain the Base Station power is on and each Beltpac to be registered is
turned off. Registered Beltpacs can be on or off.
NOTE: If you are setting up multiple Base Stations, the following steps must be
repeated for Beltpacs being registered to each Base Station.
1. Place the headset of the Beltpac being registered on your head.
2. Press the REG button on the front panel of the Base Station (#6 on Base Station
front panel illustration).
●The STATUS display (#4 on Base Station front panel illustration) will show a
small “o” for open.
NOTE: If you wait too long before going on to Step 3, the Base Station will exit
registration mode and you will have to repeat Step 2.
3. Press and hold the ISO button on the Beltpac while you press and release the
PWR (power) button to turn the unit on, then release the ISO button. This will cause
the Beltpac to enter the registration mode.
●The two power lights at the corners of the Beltpac near the IC and ISO buttons
will blink red, then blink green two or three times and turn off.
●Wait! There may be a short delay.
Beltpac / All-In-One Headset Setup and Registration
The rst time you operate the DX121 system, you must register each BP200 Beltpac and/or WH220 All-In-One Headset for use
with a specic Base Station. The Base Station will then recognize all registered beltpacs and headsets when their power is on and
differentiate between them and other electronic equipment operating on the same frequencies. If a beltpac or headset is added,
replaced or repaired later, the new one must be registered and the replaced one remains in memory. A maximum of 4 beltpacs
and headsets can be registered to a single Base Station at one time. If the maximum number of 4 is exceeded, you must clear all
current registrations and re-register all active beltpacs and headsets.
NOTE: The following two pages are for Beltpac setup and registration. All-In-One Headset setup and registration instructions are
on pages 15 and 16.
Set Up Beltpacs
Before registering them, set up all Beltpacs as follows:
1. Insert a fully charged battery in the Beltpac,
with the metal contacts on the end of the
battery inserted rst. Press it in until it snaps.
2. Place the Beltpac in the pouch.
3. Plug the headset cable connector into the
Beltpac.
Step 1
Step 2
Step 3
6
4
0

14
If registration is successfully completed:
¾A voice message in the headset will say “Power on, Beltpac #, Version #, Begin registration, Registration complete, …”
¾After a delay of up to 15 seconds, the STATUS display will show the ID number assigned to this Beltpac for about 10
seconds.
NOTE: ID numbers are assigned sequentially as 0 through 3.
¾The power light on the Beltpac, next to the IC button, will remain on steady green.
¾Repeat Steps 1 to 3 at the bottom of page 13 for each Beltpac to be registered.
If registration failed:
¾A voice message in the headset will say “Power on, Beltpac #, Version #, Begin registration, …” Both power lights on the
Beltpac will be blinking red, and there may be a delay of up to 90 seconds before you hear “Registration failed” and the
STATUS display (#4) goes blank.
¾Press RESET (#7) on the Base Station. To press RESET, insert a small paper clip or similar object into the RESET hole
at the lower-left corner of the Base Station front panel. When the STATUS display (#4) becomes blank, press the REG
button (#6) and register the Beltpac again. If registration fails again, call your dealer for assistance.
If you try to register more than 4 devices (combination of beltpacs or headsets) to a
Base Station:
¾An “F” (for registration “Full”) will appear on the STATUS display (#4) on the Base Station and you will hear “Registration
failed” in the Headset.
¾Clear all current registrations by pressing the CLR/BND button (#5) and RESET (#7) simultaneously. To press RESET,
insert a small paper clip or similar object into the RESET hole at the lower-left corner of the Base Station front panel.
Continue holding the CLR/BND button after you release RESET, until the clear code “c” (lower case) appears on the
STATUS display.
¾Register all active Beltpacs, one at a time.
C
6
4
F5
7

15
Register All-In-One Headsets
Headsets must be within 6 feet (1.83 meters) of the Base Station while you are registering them. Be certain the Base Station
power is on, and each Headset you are going to register is turned off before you begin. Headsets that are already registered can
be on or off.
NOTE: If you are setting up multiple Base Stations, the following steps must be repeated for Headsets being registered to each
Base Station.
1. Put the Headset on your head.
2. Press the REG button on the front panel of the Base Station (#6 on Base Station
front panel illustration).
●The STATUS display (#4 on Base Station front panel illustration) will show a
small “o” for open.
NOTE: If you wait too long before moving to Step 3, the Base Station will exit
registration mode and you will have to repeat Step 2.
3. Press and hold the ISO button on the Headset while you press and release the
power button to turn the unit on, then release the ISO button. This will cause the
Headset to enter registration mode.
●The Headset power light will begin blinking red, then will blink green two or
three times and go off. There may be a short delay.
Set Up All-In-One Headsets
Before registering them, insert a fully charged battery in each Headset. When a
battery weakens, you will hear “Change battery”. At this time, remove the battery
from the headset by pressing the blue battery-release latch to remove the battery.
Power On/Off
¾To turn power on
Press and release the power button on the inside of the Headset housing.
A voice message in the earpiece will say “Headset #” and the power light
on the opposite side of the earpiece will turn on.
¾To turn power off
Press and hold the power button for approximately 3 seconds. A voice
message in the earpiece will say “Headset off”, and the power light on the
opposite side of the earpiece will go off.
Battery-release latch
(blue button)
Battery
6
4
o
Power button
Power
Light