Maxon MDM Series User manual

MDM SERIES
DMR TIER II TDMA & ANALOG MOBILE RADIO
USER MANUAL
UHF & VHF Transceiver
Printed in Korea
11535 W. 83rd Terrace, Lenexa, KS 66214
Toll-Free: 800-456-2071 (US Only), 913-859-9515
Website: www.maxonamerica.com
* User Manual is subject to change without notice.

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1. Features of the MDM Series
2. Specifications
3. Dimensions & Appearance
4. Assembly & Installation
5. Controls & Operation
6. Functionality
7. Single Frequency Repeater Function (MDM-4000 Only)
8. Precautions
9. Safety Notes & FCC
10. Warranty Card
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Table of Contents
Thank You for Purchasing the MDM Series Radio!
1. Before operating the radio, please read the user manual carefully.
2. Functions and specifications are subject to be changed without notice for improvement of
the radio performance.

1. Features of the MDM Series
Maxon’s high-powered MDM Series is an acutely designed compact DMR Digital/Analog
Mobile Radio. Packed with popular digital features such as messaging, AES Encryption, contact
lists, and call recording. MDM Series Mobile Radio can be turned into a Base Station with a cabinet
enclosure, power supply, and desk mic. The external accessory connector can be used in various
ways, contact your local dealer for more information.
OLED Display
2,048 Programmable Channels, 64 Zones (1,024 Max Ch Per Zone)
ETSI Standard DMR Protocol Tier 1 & 2
VHF (50W) / UHF (45W) Maximum output power
6 selectable transmit power levels
Power Source DC+13.6V 15%
Automatic Mixed Mode detects and switches between DMR & Analog Mode
Mixed Channels (Digital & Analog)
Contact List capacity of 240
Remote Radio Stun / Revive
Transmit and Receive Text Messages
CTCSS, DCS
Call Recording
Data compatible between Moto TRBO and HYT
BCL (Busy Channel Lock)/BCLO (Busy Channel Lock Override)
Lone Worker (Digital Channels Only)
Selectable Squelch Level (0~5)
Encryption (AES256 Standard)
4W @ 8 Ohms Audio Output
Heavy-Duty Microphone
Internal or External Speaker
TX Interruption, Priority call- Factory Option
Motorola/DMRA AES256 Encryption - Factory Option
SFR (Single Frequency Repeater) - Factory Option for MDM-4000 Series
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2. Specifications
Frequency Range
Frequency Stability
Programmable Channels
Zone
Channel Bandwidth
Digital Vocoder
Dimensions
Weight
Power Source
Current Drain (Maximum)
MDM-4124/2124 (136~174 MHz)
MDM-4424/2424 (406 ~470 MHz)
1.5ppm (-30 to +60°C)
2,048 Channels
64 (1 Zone = Max 1,024 Channels)
12.5KHz
AMBE++
44.5mm (H)X165 (W)X172 (D)
1.1Kg
DC +13.6V, 15%
Receive mode, rated audio out - 1A (Audio Max)
Transmit mode - 11A
Standby mode - 150mA
Sensitivity
Selectivity
Spurious & Harmonic Rejection
FM Hum & Noise Ratio
Audio Output Power
Audio Distortion
Audio Response
Input Impedance
0.25uV (BER 1%)
70dB (12.5KHz)
36 dBm (< 1GHz) -30 dBm (> 1GHz)
40dB (12.5KHz)
4 Watt/8-ohm load
Less than 3%
+1, -3 dB from 6dB per octave de-emphasis Characteristic
from 300 ~ 3000Hz
50 ohms
Receiver
RF Power Output
Spurious & Harmonic
FM Hum & Noise Ratio
Audio Distortion
Audio Response
Input Impedance
5/10/20/30/40/50Watts
-36 dBm (< 1GHz) -30 dBm (> 1GHz)
40dB (12.5KHz)
Less than 3%
+1, -3dB from 6dB per octave pre-emphasis Characteristic
from 300 ~ 3000Hz
50 ohms
Transmitter

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3. Dimensions & Appearance 4. Assembly & Installation
4.1 In-Box Contents
DC power cable with 15A Fuse (1)
Mounting Bracket (1)
Screw set
5 x 16 mm self-tapping screws (4)
Hex-headed screws with washer (4)
Spring washers (4)
Flat washers (4)
Microphone (with cable)
ACC 800 (1)
Microphone hanger (with 4x16mm self-tapping screws) (1)
Instruction manual
Figure 4-1) Parts & Installation
Microphone
Spring Washer
M4 x 6mm
Hex-headed Screw
Heat Sink
(Aluminum Diecasting)
Antenna Connector
DC Power Cable Power Input
Connector
Fuse
Red(+) Cable
Black(-) Cable
5x16mm
Self-tapping Screw
Flat Washer
M4 x 6mm
Hex-headed Screw
Mounting Bracket
12V Vehicle Battery

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4.2 Accessory Jack Layout
ACC (D-SUB 15 Pin Connector)
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
I/O
I/O
I
O
O
I
O
I
I/O
I/O
I/O
I/O
O
O
O
-
Pin Name
GPIO0
IGN
EXT_SPK
EXT_AUDIO
EXT_MIC
TXD/FCN1
RXD/FCN2
EXT_PTT
GPIO2
COR
EXT/INPUT
DC+5V
HR1
HR2
GND
Description
Currently Undefined
Ignition Signal Input
Loudspeaker Output
Audio Output
Audio Input
TX Serial Data
RX Serial Data
External PTT
Currently Undefined
For Squelch Output
Programmable
DC Power Supply
Horn Alert Signal Output
Horn Alert Signal Output
Ground
Specification
3.3V TTL
Power on: 8V
8, 4Watt
500mV
5k
3.3V TTL
3.3V TTL
PTT OFF: 3.3V(H)
PTT ON: 0V(L)
3.3V TTL
SQ ON: 3.3V
SQ OFF: 0V
High Impedance
DC+5.0V Max 100mA
Max 3A
Max 3A
Ground
Microphone Jack
Pin No
1
2
3
4
5
6
7
8
I/O
O
O
-
I
-
I
I
I/O
Pin Name
MBL
DC+13.6V
GND
PTT/TXD0
ME
MIC
HOOK/RXD0
DM
Description
Microphone Backlight
DC Power Output
Ground
PTT/PC Serial Data
MIC Ground
MIC Signal Input
HOOK/PC Serial Data
MIC Data Detection
Specification
-
13.6 15%
Ground
3.3V TTL
MIC Ground
600
3.3V TTL
High Impedance
Speaker Jack (3.5mm Phone Jack) 4Watt/8
Pin No
1
2
I/O
O
O
Pin Name
SPO
GND
Description
External Speaker Output
Ground
Specification
4Watt/8
Ground
DC Input Power Connector
Antenna Connector
Impedance is 50
Pin No
Red
Black
I/O
-
-
Pin Name
DC+13.6V
GND
Description
DC Power Output
Ground
Specification
13.6 15%
Ground

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5.1 Power ON/OFF Volume Knob
Press and hold in the Power On/Off knob to power on the radio. Display screen will start with a
Maxon screen and a power-up tone. Press and hold the power on/off knob to power off. Display
screen will power off and you will hear a voice notification stating “Good-bye”
Audio volume level can be adjusted by rotating the Power On/Off volume knob clockwise/counter-
clockwise.
5.2 PTT Button
Press & hold the PTT button to transmit voice and release the PTT button to receive voice. It is
recommended to talk 2~4 inches from the microphone.
5.3 Menu Button
To enter the menu tree as displayed in Figure 5-3a, press the MENU button. Press the to move
to the right and press to move to the left. To enter the submenu, press the MENU button one
more time.
5. Controls & Operation
Emergency MIC
LED Status
PTT Button
Menu Button
Power ON/OFF
Volume Knob
Programmable Button Cancel/Return
Button
Menu/Channel
UP Button
Menu/Channel
Down Button
Hand MIC
Jack
Hand MIC
Figure 5-1) Controls, Knobs and Buttons
Figure 5-3a) MDM Series Digital Menu
Figure 5-3b) MDM Series Full Menu Tree (Digital Channel)
Contact
Contacts
Individual call
Group Call
All Call
Message
Quick Text
Inbox
Outbox
Call Logs
Incoming
Outgoing
Digital Mobile Radio Main Menu
Scan
Scan On/Off
Scan List
Zone select Settings
Power Level
Encryption
Lone Worker
BCL/BCLO
Keypad Lock
Sound
Backlight
Radio Info
Radio ID
Model Name
PCB Version
Freq Range
SW Version
BB Number
BB Version
Last update
Made Date
DB Version
Messages Call Logs Record Scan Zone Setting Radio Info
Recording
Record ON/OFF
Record List
Delete All
Brightness
LED Control
Language
Screen
5.4 Menu Button and Channel /Buttons
Press the MENU button to enter menu and press /button to highlight selection within the menu
list. Press the Menu button again to select. Pressing /button when not in a menu will move UP /
DOWN through the channels programmed into the radio.
5.5 Cancel / Menu Exit
A single press of the Cancel/Return button takes you back one step. A press and hold will exit all
menus.
5.6 Programmable Buttons (P1, P2, P3, )
Programmable buttons are available for user convenience. These buttons can be set via the radio’s
programming software
Once the radio is on, you can use a quick press of the P1 button to change zones. Selectable Zones
are displayed in order based on your radio’s programming.

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5.7 Emergency Microphone
You can program one of the programmable buttons on your mobile as an Emergency microphone
PTT switch if ever the mobile’s palm microphone is unavailable. Emergency Microphone PTT button
can be set via radio programming software.
5.8 15 Pin Accessory Jack
The accessory jack as several functions such as connecting a horn relay, external speaker, external
microphone and GPIO pins. Pinout is shown in section 4.2.
5.9 LED Display
LED next to the display indicates the operational status of the radio.
LED will illuminate RED color when transmitting
LED will illuminate GREEN color when receiving
If the LED blinks GREEN, the frequency is correct, but the color code, CTCSS or DCS does not
match
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6.1 Menu selection
Press Menu Button to enter the menu mode. Figure 6-1 shows the radio menu when you are on a
digital channel. Full Digital Mode menu tree was previously displayed in figure 5-3b. Figure 6-2
shows the radio menu when you are on an analog channel
Note) Radio will exit Menu mode and go into Standby mode if no selections are made within 30
seconds.
6. Functionality
Figure 6-1) MDM Series Digital Mode Menu
Contact Messages Call Logs Record Scan Zone Setting Radio Info
Figure 6-2) MDM Series Analog Mode menu
Radio InfoSettingZoneScan
6.1.1 Contact (Digital Mode Only)
The Contact List provides a list of individuals, groups or all calls of which you can make a direct call.
To initiate a call, select the Contacts section from the menu (or press the contact button for direct
access), press the menu/enter button to see the list of contacts, press /buttons to the desired
contact and press the PTT button to initiate the call. You can set up a list of contacts within the radio
by the radio’s programming software.
The Contact Menu displays “Individual”, “Group”, and “All Call” contacts using the following icons:
- : Individual contact list (individual calls, individual messages can be sent)
* Stun Radio, Revive Radio, Check Radio, & Monitor Radio functionality is in this menu. “Stun”
will disable the desired radio’s ability to Tx. “Revive” will restore the functionality. “Check
Radio” checks to see if the target radio in your contact list is receiving. “Monitor Radio” turns
on the mic of the target radio to listen to the surrounding sound.
- : Group contact list (group call, group message can be sent)
- : All contact lists (terminals with the same channel and color code are available)
6.1.2 Text Messages (Digital Mode Only)
When a new message arrives and the radio is in receive mode, the message contents are displayed
on the OLED display and the radio’s message menu appears. When a new message arrives during
a different radio operation, it will be displayed as a message icon.
The Message menu provides three additional menu functions: Quick Message, Inbox, and Outbox.
1) Quick Text message
The radio holds 40 software programmable messages (each up to 40 characters) that the
radio sends via SMS in digital mode as a “Quick Message” To get into the Quick Message
menu, use your radio to enter the Main Menu and then select Messages. This will bring you to
the Messages menu. Select “Quick Message” to see the available messages to send.
Highlight the message you want to send and press the menu button to view the message
contents. Press the menu/select button again and highlight the recipient from your contacts list.
Press select button to select the recipient and send the message. To cancel the message,
press and hold the Cancel/Return button.
2) Inbox
Inbox stores up to 10 received text messages; After 10 messages are received in your inbox,
the oldest message is overwritten as a new message is received. When a new message
arrives, the contents will be displayed on the LCD screen. When you choose messages stored
in the inbox, you can view the received messages and the caller ID that initiated the call. You
cannot delete a received message one at a time. If you want to delete a message, you will
need to select “Delete All” from the message menu and delete all the messages in your inbox.

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3) Outbox
The message “Outbox” holds a maximum of 10 sent messages. View your outbox by selecting
“Outbox” from your Messages menu and then select the message you want to read from the
contents listed. After 10 sent messages are stored in your outbox, the oldest message is
overwritten as a new message is created. You cannot delete a sent message one at a time. If
you want to delete a message, you will need to select “Delete All” from the message menu and
delete all the messages in your outbox.
6.1.3 Call Logs (Digital Mode Only)
Call Logs menu stores only the history of your individual calls. Group Calls and All Call radio calls
are not saved. The messages are managed by your Message Inbox and Outbox.
1) Inbox
Your radio can store 10 IDs of radios who have called you in your call history Inbox. If more
than 10 IDs are received, the oldest IDs are overwritten by the new ones. The Delete menu in
your inbox is used to delete your entire call history.
2) Outbox
Your radio can store 10 IDs of radios you have called in your call history Outbox. If more than
10 IDs are stored, the oldest IDs are overwritten by the new ones. The Delete menu in your
outbox is used to delete your entire call history.
6.1.4 Voice Recording (Digital Mode Only)
You can record your incoming and outgoing radio calls with the “Voice Record” feature located in
the Main Menu when on a digital channel. Once it is turned on, all incoming audio received through
the radio and every outgoing audio transmission will be recorded in separate files. Save up to 63
calls (Max Length 1 minutes and 45 seconds). You have the ability to turn the Voice Record feature
ON or OFF in the Settings Menu. If you want to purposefully remove a recording you will need to
“Delete All” messages. Numbering for your oldest recordings start at #1 and are automatically
deleted as new recordings are captured
When the encryption mode is selected, audio is recorded on the transmitting radio and also the
receiving radio if the other radios also have encryption turned on. Transmitted audio will not be
heard and voice recordings will be silent on the receiving radios if they do not have encryption
turned on as well.
6.1.5 Scan
Scanning allows you to check a list of channels for activity. A button can be assigned to start and
stop scan or it can be accessed through the menu.
Scan lists are predefined using the programming software. There can be up to 10 scan list. These
lists can be selected in the menu by Scan/Scan List.
A scan list can also have one priority channel. If priority is selected and the radio is in scan mode,
transmit will be on the priority channel. If reception is on a non-priority channel, transmit is allowed on
that channel within the scan hang time.
1) Scan ON/OFF
On/Off setting can be set in the Scan Menu
2) Scan List
Scan list can be set via the radio’s software programmer
6.1.6 ZONE
You can organize and expand the number of available channels by moving your channels into
groups called “Zones”. Your MDM Series mobile radio supports up to, 5000 total channels using any
combination of 64 zones, with a maximum of 1,024 channels per zone. Contact your radio dealer to
program your radio’s zones.
6.1.7 Radio Settings
Radio Settings from the Main menu: Power Level (Tx), Voice Encryption, Lone Worker, Busy
Channel Lock (BCL)/Busy Channel Lock Override (BCLO), Button (Keypad) Lock, Sound, LCD
Backlight, LCD Brightness, LED Control, Screen and Language.
1) Power Level
There are 6 power levels with 1 being the lowest and 6 being the highest. The higher the level
the farther the transmission range. The power level can be changed by a programmed button
or by accessing the menu.
2) Voice Encryption
Your radio’s Voice Encryption feature is used to encrypt incoming and outgoing voice
communications. Menu setting on radio turns encryption ON or OFF. Encryption settings are
adjustable using your radio dealer’s programming software. Encryption can be set for each
digital channel. Key length is itself is created automatically according to key length. You can
create up to 40 selectable receiving radios if they do not have encryption turned on as well.
The radio will show reception, but there will be no audio.

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3) Lone Worker (Digital Mode Only)
When turned on, the “Lone Worker” feature will automatically send out an emergency call to
the rest of your fleet through your radio when there is no radio activity within the time set in the
menu. To activate, select “On” after you enter the Lone Worker menu. Press up or left on the
circle button to get to the timer (Set Times). Choose between 1-100 minutes for Lone Worker
to activate and press the select button to make the selection. “Set Success” will appear on the
screen when activated.
4) BCL/BCLO
The BCL/BCLO function is used to prevent the radio from transmitting while the channel is
busy to avoid interruption of a conversation in progress. The default setting is OFF.
(Busy Channel Lockout): Prohibits transmission on the same RF frequency.
BCLO (Busy Channel Lockout Override): Allows transmit only if the CTCSS/DCS or Color
Code match.
5) Keypad Lock
Keypad lock is used to lock the keypad from accidental keypresses. When the keypad lock
function is on, all buttons are locked except the PTT button, the emergency button and power
ON / OFF switch. If turned on from the Main Menu, the “Key Lock” feature is activated when
there is no input information for 5-20 seconds (programmable through settings menu).
Caution: A programmable key needs to be programmed for Keypad Lock before setting it
from the main menu.
6) Sound
This function enables to setup and adjust volume and tones associated with Volume, Call
Tone, Message Tone, Key Tone, Start-up Tone, Mic Input Set and Fixed Vol.
- Volume of the keypresses can be adjusted. (Off, Soft Medium, Loud)
- Call Tone. There are 4 types of calls. If it is selected to “off”, all call tones are disabled.
- Test Message Alert Tone can be enabled or disabled.
- Button Tone can be enabled or disabled.
- Starting Tone can be enabled or disabled.
- Microphone Input sound can be adjusted. (Soft, Default, Loud Mode, Louder Mode)
- Fixed Volume is used to prevent accidental volume change. If enabled and the volume control
is rotated, the display will show “Fixed Volume Operation”.
7) OLED LCD Backlight
OLED LCD Backlight function ON or TIMED the OLED LCD backlight.
8) OLED Contrast (Brightness)
OLED Contrast (Brightness) function adjusts the contrast/brightness of the LCD from 1 (dim) to
7 (brightest) levels
9) LED Control
LED Control function on or Timed disables the LED status display. Used to turn your LED
status display ON or OFF. Your radio dealer can adjust detailed LED status behavior using the
radio’s programming software.
10) Language
Language is used to select the language displayed in the radio menus. Selection of Spanish
or English.
11) Screen setting
Screen setting is used to select between 3 different screen modes (see fig 6-1).
Figure 6-1) Description of Display screen selections
6.1.8 Radio Information
Used to show the radio’s information: Radio ID, Model Name, PCB Version, Freq Range, SW
Version, BB Number, BB Version Last SW Update, Made Date, DB Version. Press the “Select”
button to make a selection in this menu.

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What is it?
MDM Series mobile radios have a factory-optional feature called Single Frequency Repeater (SFR)
that allows your mobile radio to be used as a repeater to help radios communicate that might fall out
of normal communications range. SFR is different from traditional repeater mode in that the uplink
and downlink frequencies of the repeater are the same. Your radio dealer will need to activate this
feature in your MDM Series mobile radio.
How it works:
For DMR two-way radios, there are two “slots” at a single frequency, we call them “Slot 1” and “Slot
2”. Using interference cancellation technique, our DMR radio with SFR feature can use one slot to
receive a call and the other slot to transmit the call on the same frequency at the same time.
7. Single Frequency Repeater Function (MDM-4000 Series Only)
portable radios are out of range
in direct mode
Group 1 Group 2
Single Frequency Repeater (SFR) mode works as a very fast store and forward repeater. Radio 1
only transmits for 30 msec and then waits while the radio with SFR takes the voice data packets
from radio 1 and sends them out on time slot 2 for 30 msec.
How do I use it?
Your radio dealer needs to program all your portable radios that you wish to use with the SFR
feature to talk on the SAME FREQUENCY, but have one group talk on SLOT 1 and the other group
that is out of reach to talk on SLOT 2. When turned on, the user of the MDM-4000 radio will only
need to set the mobile radio to the channel where the SFR frequency is programmed and keep the
mobile radio turned on. The radios you want to connect to the SFR channel to reach each other now
just need to turn to the frequency & color code the SFR channel was programmed for and they will
be able to communicate through the SFR repeater even though they are out of range when trying to
reach each other directly on other channels (Simplex mode).
Why It is Used
1. In simplex mode, your signal coverage can be extended, especially in closed or isolated small
areas of a signal’s dead zone or a weak signal zone.
2. Saves frequency resources. A single frequency point can set up a complete repeater system.

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Be careful when removing your antenna from the Radio and don’t transform your antenna or
make any changes to your antenna. Strong electronic waves emitted from the Radio can have an
effect on the performance of the Radio if the antenna is modified and can cause the Radio to have
a defect not covered under warranty.
Don’t use other manufacturer’s accessories (such as power adaptor, microphone, external
speaker microphone and earphone, etc.). Unknown or unauthorized accessories may damage
the radio and void the warranty.
Don’t disassemble or reorganize the Radio. The disassembly or reorganization of your radio is
punishable by law and can cause damage to the radio that will not be covered by the warranty
Don’t use frequencies you do not have a permit for.
Avoid excessive shock to the Radio. Don’t place the Radio where the direct sunlight and/or the
high temperature occurs,
If using radio in an area where medical equipment is being used, please get permission from
relevant staff to prevent interference issues.
Be careful when using your radio in a place where computers or other electronic devices are
being used because the strong electronic waves from the radio can affect this equipment.
8. Precautions
7.1 Precautions for Safe Operation of this equipment.
7.2 Do not use the radio where prohibited
Your radio emits a strong electronic wave which may have an effect on the operation of other
equipment and can also be affected by those other devices.
Please keep the radio away at least 1 inch from the body.
Do not touch antenna if it is damaged. Risk of skin burn can occur if the outside surface of
antenna gets stripped out.
Please don’t listen to the radio at a high-volume level when using earphones. Loud volume may
have a lasting bad effect on your hearing.
It is recommended to adjust the volume step by step to the level you want after you set the
radio volume of the radio at a low level.
Turn off the radio in areas where there is a strong electromagnetic force
9. Safety Notes & FCC
FCC RF EXPOSURE COMPLIANCE REQUIREMENTS FOR OCCUPATIONAL USE
ONLY
The Federal Communications Commission (FCC), with its action in General Docket 93-62,
November 7, 1997, has adopted a safety standard for human exposure to Radio Frequency
(RF) electromagnetic energy emitted by FCC regulated equipment. Proper operation of this
radio will result in user exposure far below the Occupational Safety and Health Act (OSHA)
and Federal Communications Commission limits.
DO NOT transmit for more than 50% of total radio use time (50% duty cycle). Transmitting more than
50% of the time can cause FCC RF exposure compliance requirements to be exceeded.
This radio is NOT approved for use by the general population in an uncontrolled environment. This
radio is restricted to occupational use, work related operations only where radio operator must have the
knowledge to control the user’s exposure conditions for satisfying the higher exposure limit allowed for
occupational use.
When transmitting, hold the mic 2 to 4 from your mouth when speaking.
The radio is transmitting when the red LED on the front of the radio is illuminated. You can cause the
radio to transmit by pressing the PTT bar on the microphone.
These are required operating configurations for meeting FCC RF exposure compliance. Failure to
observe these restrictions means violation.
This device complies with part 15 of 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.

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WARRANTY CARD
Thank you for purchasing MDM Series.
1. This product has passed strict quality control and testing process.
2. Warranty is three years from original date of purchase unless an extended warranty
has been purchased.
Failure of the product under normal operating conditions, during the warranty period may
be repaired by Maxon America, Inc or our authorized service organization free of charge.
3. For the following cases, some service fees will be charged.
When repair occurs after the warranty period has passed.
When the product is damaged due to user’s mishandling, abuse or improper operation.
When the product is damaged due to user’s modification, attempted repair or otherwise
access to sealed/non-user serviceable items.
When the product is damaged due to fire, pollution, earthquakes and any other natural
or unnatural conditions, accidents, etc.
4. Product and personal information
Please contact Maxon America, Inc below for Return Merchandise Authorization
(RMA) number before you send your radio back for service.
MAXON AMERICA, INC
11535 W. 83rd Terrace, Lenexa, KS 66214
Toll-Free: 800-456-2071/ Phone: [phone]
Website: www.maxonamerica.com
Email: [email protected]
PRODUCT NAME
SERIAL NUMBER
PURCHASE DATE
NAME
ADDRESS
PURCHASER
MDM SERIES