Lectrosonics DMTH4 User manual

DMTH4
Digital Telephone Hybrid
INSTALLATION and QUICK START GUIDE
Rio Rancho, NM, USA
www.lectrosonics.com
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DMTH4
LECTROSONICS, INC.
2

Installation Guide
Rio Rancho, NM 3
This symbol, wherever it appears, alerts
you to the presence of uninsulated danger-
ous voltage inside the enclosure -- voltage
that may be sufficient to constitute a risk of
shock.
This symbol, wherever it appears, alerts
you to important operating and mainte-
nance instructions in the accompanying
literature. Please read the manual.
When using your telephone equipment, basic safety
precautions should always be followed to reduce the
risk of fire, electrick shock and injury to persons, includ-
ing the following:
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install in ac-
cordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as radia-
tors, heat registers, stoves, or other apparatus
(including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two
blades with one wider than the other. A grounding
type plug has two blades and third grounding prong.
The wider blade or the third prong are provided
for your safety. If the provided plug does not fit into
your outlet, consult an electrician for replacement of
the obsolete outlet.
10) Protect the power cord from being walked on or
pinched particularly at plugs, convenience recepta-
cles, and the point where they exit from the appara-
tus.
11) Only use attachments/accessories specified by the
manufacturer.
12) Use only with the cart, stand, tripod,
bracket, or table specified by the
manufacturer, or sold with the ap-
paratus. When a cart is used, use
caution when moving the cart/ap-
paratus combination to avoid injury
from tip-over.
13) Unplug this apparatus during lightning storms or
when unused for long periods of time.
Important Safety Instructions
14) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or
plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped.
15) WARNING -- TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS AP-
PARATUS TO RAIN OR MOISTURE.
16) The AC mains plug, or appliance coupler shall be
readily available to the operator as a means of
power disconnection, if applicable.
17) Unit shall be connected to a MAINS socket outlet
with a protective earthing connection.
18) Do not use this product near water for example,
near a bathtub, washbowl, kitchen sink or laundry
tub, in a wet basement or near a swimming pool.
19) Avoid using a telephone (other than a cordless
type) during an electrical storm. There may be a
remote risk of electric shock from lightning.
20) Do not use the telephone to report a gas leak in the
vicinity of the leak.
21) Use only the power cord and batteries indicated in
this manual. Do not dispose of batteries in a fire.
They may explode. Check with local codes for pos-
sible special disposal instructions.
22) “CAUTION: To reduce the risk of fire, use only No.
26 AWG or larger (e.g., 24 AWG) UL Listed or CSA
Certified Telecommunication Line Cord”
SAVE THESE INSTRUCTIONS

DMTH4
LECTROSONICS, INC.
4
Table of Contents
Important Safety Instructions................................................ 3
Introduction............................................................................. 5
Unpacking the unit ................................................................ 5
Controls and Features ........................................................... 6
Front Panel............................................................................ 6
Rear Panel ............................................................................ 6
Hardware Installation ............................................................. 7
Installing the DM system into a rack ..................................... 7
Cables .................................................................................. 7
Audio Connections ............................................................... 7
Audio Inputs (AUX and CODEC) ......................................... 7
Audio Outputs (AUX and CODEC)........................................ 8
Telephone Line Jack ............................................................. 8
Programmable Inputs............................................................ 8
Programmable Outputs ......................................................... 8
Expansion I/O ports .............................................................. 9
CODEC and TEL Remote Control Ports............................... 9
Control System Interconnections ....................................... 10
Installing LecNet2™Software and USB Driver ................... 11
Installation with LecNet2 Device Installer ........................... 11
Manual Installation .............................................................. 12
Basic System Setup ............................................................. 14
Control System Interconnections........................................ 14
Initial Setup ......................................................................... 14
Master/Slave Configuration................................................. 15
Using the DMTH4 Control Panel
to Change Master/Slave Mode............................................ 15
Initial Setup Hints................................................................ 16
Example Teleconferencing Setup........................................ 17
Setting up the DMTH4 Main Matrix..................................... 18
Setting up the DM1624 Main Matrix.................................... 18
Setting up the DM1624 Expansion Matrix........................... 18
Setting up the DMTH4
Output Source Multiplexer................................................... 19
Basic System Operation ...................................................... 19
Making a Phone Call........................................................... 19
Setting Up Automatic Telephone Answer
and Automatic Disconnect .................................................. 21
Connecting to the CODEC Interface
using the Activity Tab .......................................................... 21
FCC Part 68 Compliance...................................................... 22
FCC Part 15 Compliance...................................................... 22
Service and Repair ............................................................... 23
Returning Units for Repair............................................... 23

Installation Guide
Rio Rancho, NM 5
Introduction
The purpose of this guide is to assist in the setup and
operation of a typical DMTH4 system. This guide as-
sumes familiarity with the DM Series Digital Audio Pro-
cessors, its components and software menus and setup
screens. To get the most out of the DMTH4 system, it
is suggested to review the information presented in the
DMTH4 Series Reference Manual.
A detailed Help is also available to assist in the setup
and operation of a DMTH4 system using the USB inter-
face and a Windows® XP, VistaTM or 7 operating system.
In addition to assistance setting up and operating the
DMTH4 system, the Help files include a complete listing
of the DMTH4 Serial Commands. These commands
can be used to setup and operate the DMTH4 system
via external devices using either the USB or RS232
serial port.
Unpacking the unit
Compare the packing list enclosed with the unit with
the original order. Inspect all items for damage. Im-
mediately call 1-800-821-1121 to report any items that
are missing or damaged. The sooner we get notified,
the sooner we can get any needed replacement items
shipped to your location.

DMTH4
LECTROSONICS, INC.
6
TELEPHONE
SET LINE
EXPANSION TEL RC
1: GND
2: IN 1
3: IN 3
4: IN 5
5: IN 7
25
13
14
1
6: IN 9
7: IN 11
8: GND
9: OUT 1
10: OUT 3
11: OUT 5
12: OUT 7
13: GND
14: +5V
15: IN 2
16: IN 4
17: IN 6
18: IN 8
19: IN 10
20: +5V
21: OUT 2
22: OUT 4
23: OUT 6
24: OUT 8
25: +5V
PROGRAMMABLE
INPUTS / OUTPUTS
RS-232
LecNet 2
USB
POWER
90-240V 50/60Hz 15W
AB
TELEPHONE HYBRID
MADE IN U.S.A.
TX RX
RX TX
CODEC RC
CODEC AUXCODEC AUX
U.S. Patent Number: 5,414,776
LINE
INPUTS
MIC/LINE
OUTPUTS
LECTROSONICS, INC.
Complies with Part 68 FCC rules.
Registration Number:4J3BR09BDMTH4
Ringer Equivalence: 0 . 9 B
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.
Controls and Features
POWER On/Off Switch
The Power On/Off Switch is used to turn the DMTH4 on
(1) or off (0).
USB Port
Standard USB connector for the setup and control of a
DMTH4 from an Windows 2000 or Windows XP com-
puter system with USB interface.
Status LED
The DMTH4 is normally configured as the end slave
unit in a DM Series stack. In this configuration, the
Status LED glows steadily when power is applied and a
Master unit has been detected. The STATUS indicator
will blink to indicate that it has not found the Master unit
or some other error exists.
Note: The DMTH4 is shipped from the factory
configured as a Master unit. In this mode, the
Status indicator glows steadily when power is
applied.
Mode Switch
If a unit configured to run in Slave mode doesn’t detect
a master unit on powerup, it will refuse to boot up and
the Status LED will blink rapidly. In this case, pressing
the Mode switch will force the unit to boot up temporar-
ily in Master mode to allow settings to be examined
or changed. Cycling the power returns the DMTH4 to
Slave mode.
Pressing the Mode switch while powering up the
DMTH4, places the unit in Software Update mode. The
Status LED blinks slowly while the firmware is updated,
then extinguishes when the process is complete. Cy-
cling power exits Software Update mode.
Front Panel
Rear Panel
POWER Plug
Standard NEMA 5-15 three-pin power plug capable of
accepting 100-240 VAC, 47-63 Hz.
RS232 Port
A serial RS232 interface provided for setup and control
via computer serial port, or for connecting RS-232 se-
rial control devices from other companies.
USB Port
Standard USB connector for the setup and control of a
DMTH4 from an Windows 2000 or WIndows XP com-
puter system with USB interface.
Programmable Input and Output Ports
Programmable inputs or outputs used to enable control
over a variety of parameters or to indicate the current
state of a programmable input.
DANI
DANI, or Digital Audio Network Interface, is used to
route the digital audio signals passing between the
master and slave units in stacked configurations.
TEL/CODEC RC
These interfaces are used to connect RCWTH4 remote
control units.
Audio Inputs and Outputs
Analog audio input and output connectors for Codec
and Aux ports .
Telephone Set/Line
RJ11 jacks for connecting a standard telephone line
and a single-line telephone set to the DMTH4.
POWERUSBSTAT USMODE
TELEPHONE HYBRID INTERFACE
R
POWER On/Off SwitchUSB PortStatus LEDMode Switch
POWER Plug RS232 USB Programmable
Input and Output
Ports
DANI
Tel RC Line Inputs
(Codec/Aux)
Telephone
Set/Line
Mic/Line Outputs
(Codec/Aux)
Codec RC

Installation Guide
Rio Rancho, NM 7
DM In
+
-
Source
+
Unbalanced source to DM input
(3-Wire)
Shield
DM In
+
-
Source
+
Unbalanced source to DM input
(2-Wire)
Shield
Balanced source to DM input
(3-Wire)
DM In
+
-
Source
+
-
Shield
Installing the DM system into a rack
The DMTH4 occupies a single space. There are no
special ventilation requirements. Mount with 4 rack
screws using the appropriate mounting holes. It is rec-
ommended to use nylon washers to prevent damage to
the front panel’s finish when tightening the screws.
For North American installations, connect the Power
Cable supplied with the unit between the DMTH4 and
a stable power source. All DM processors have inter-
nal switching power supplies that can tolerate voltages
ranging from 100 VAC to 240 VAC. Use an approved
power cable for installations outside North America.
Cables
It is recommented to use lacing bars for cable strain
relief when mounting in a rack. Use only professional
audio cable with proper shielding - typically, two con-
ductor plus ground/shield.
Audio Connections
The analog audio inputs and outputs are connected
through 5 pin de-pluggable connectors. Strip the insu-
lation back 1/8 to 3/16” but do not tin (apply solder to)
the leads. Insert the wire into a de-pluggable connec-
tor, leaving less than 1 mm of bare wire exposed, then
tighten the retaining screw.
Caution: Do not over tighten the retaining
screw.
Note the labeling on the DMTH4 Chassis for the posi-
tive and negative leads. Ground is shared between two
connections (the center pin).
Note: The DM Series does not have a “pin 1
problem.” Inputs and outputs are true differential
connections.
Audio Inputs (AUX and CODEC)
Unbalanced Sources
Unbalanced audio sources (positive and ground)
include items such as consumer VCR’s, DVD players,
etc., and may use both two wire and three wire cables.
In either case, the positive output from the source
should be connected to the appropriate positive (+)
input on the DMTH4. The shield or negative (–) output
should be connected the DM’s negative (–) input. Two
wire cables should have a jumper between the DMTH4
negative input and ground. Three wire cables should
have the shield connected to the DMTH4’s ground input
and the shield and negative (–) leads joined together at
the unbalanced source end.
Balanced Sources
Balanced differential sources from external equipment
and microphones should be wired according to Bal-
anced source to DM input (3-Wire). (See illustration.)
When connecting balanced sources to the DMTH4, it
is important to not connect chassis ground (shield) to
either signal conductor.
Hardware Installation
5-pin depluggable
connector
Do not leave more than
1 mm of exposed wire
beyond the connector.
Do not apply
solder to leads
Retaining Screw
(Do not overtighten)

DMTH4
LECTROSONICS, INC.
8
LED is on when the programmable output is active
380 Ohms
Programmable Output Pin
380 Ohms
LED is off when the programmable output is active
Programmable Output Pin
Gnd (from Programmable I/O
Pins 1, 8, 13)
1N4001
or equiv.
External
DC Voltage
Source
(<40VDC)
Relay Coil
Coil current <100mA
Programmable Output Pin
Gnd (from Programmable I/O
Pins 1, 8, 13)
Relay is on when the programmable output is active
+5VDC (from Programmable I/O
Pins 14, 20, 25)
+5VDC (from Programmable I/O
Pins 14, 20, 25)
10K Linear Potentiometer
CCW CW
+5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Input
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd
Potentiometer Connection for
Analog Control of Gain
Input RP Gain Control or Analog Output RP Gain
Control on the Programmable Inputs control tab in
the Control Panel GUI. See the Rear Panel Ctrl tab in
the Control Panel software Help for setting all program-
mable input parameters.
Programmable Outputs
Programmable outputs are used to indicate the current
state of a programmable input, monitor activity on tele-
phone or codec interfaces, and monitor active preset
changes. Each programmable output is the electrical
equivalent of a contact closure to ground. When a
programmable output is “active”, it conducts current to
ground. When the programmable output is “inactive”,
no current flows to ground. The maximum usable volt-
age for the programmable outputs is 40 V and they will
safely conduct up to 100 mA DC continuous. Following
are some typical uses for the programmable outputs.
Audio Outputs (AUX and CODEC)
The AUX and Codec outputs are a balanced differential
configuration and include an attenuator to reduce the
signal to mic level. Wire these outputs as indicated in
the following illustration.
Telephone Line Jack
Connect a standard telephone cable with RJ11 connec-
tors between the back panel Telephone Line Jack and
the host telephone system.
Programmable Inputs
Programmable inputs are provided to enable external
control over a variety of parameters. Each input can
respond to a contact closure, a DC voltage source,
or the variable voltage output from a potentiometer.
The following illustrates common connections to the
programmable input pins. (See also Programmable
Inputs and Outputs Wiring Example.)
No external pull-up resistors are necessary because
each programmable input is internally pulled up through
a 100K resistor to +5V. When using a continuous volt-
age with one of the programmable inputs, the function
of the programmable input must be set to either Analog
DM Out
+
-
Destination
+
-
DM Out to Balanced Input
(3-Wire)
Shield
DM Out
+
-
Destination
+
DM Out to Unbalanced Input
(3-Wire)
Shield
DM Out
+
-
Destination
+
DM Out to Unbalanced Input
(2-Wire)
Shield

Installation Guide
Rio Rancho, NM 9
Note: The diagram shows an external DC
source powering the relay coil. This is necessary
whenever coil voltages exceed 5 V.
Both LEDs and 5V relay coils can be powered by the
+5 V DC pins on the programmable input connector, as
long as the maximum combined current for all LEDS
and relay coils does not exceed 100 mA.
Expansion I/O ports
The four RJ45 connectors on the rear panel are used
to interconnect LecNet2™ units together. These ports
are only used to transfer digital audio information via
the Digital Audio Network Interface (DANI) between the
units.
PROGRAMMABLE INPUTS/OUTPUTS
1 - GND
2 - IN 1
3 - IN 3
4 - IN 5
5 - IN 7
6 - IN 9
7 - IN 11
8 - GND
9 - OUT 1
10 - OUT 3
11- OUT 5
12 - OUT 7
13 - GND
14 - +5V
15 - IN 2
16 - IN 4
17 - IN 6
18 - IN 8
19 - IN 10
20 - +5V
21 - OUT 2
22 - OUT 4
23 - OUT 6
24 - OUT 8
25 +5V
113
ccw cw ccw cw
ON OFF
OUT 3
OUT 4
OUT 1
IN 1
IN 2
IN 3
500 Ohms
500 Ohms
500 Ohms
LED
LED
LED
Potentiometer
Potentiometer
Switch
Programmable Inputs and
Outputs Wiring Example
Three Programmable Inputs:
2 - 10 K linear potentiometers
for volume control
1 - To bble switch for muting
3 Programmable Outputs:
LEDS for function indicators
(380 to 500 Ohm resistors in-line
to avoid burning out LEDS)
NOTE
Common Connections can be used for
all voltage and ground connections
among all devices.
CODEC and TEL Remote Control Ports
1 GND
2 Connect Button
3 Privacy Button
4 Volume Up Button
5 Volume Down Button
6 Privacy LED
7 Connect LED
8 GND
WARNING: The Expansion I/O connectors are
NOT Ethernet, CobraNet or any other network
based device interconnects. Connecting them
to Ethernet, CobraNet or other network based
device may cause damage to either unit.
In a stacked configuration, one unit must be configured
as the Master unit and the others as Slave units. The
DMTH4 is normally configured as the last Slave unit in
a DM Series chain.
To connect the Master/Slave units, plug one end of a 12
inch Cat5e cable (two are supplied with each with unit)
to the transmit (TX) port on the Master unit, and con-
nect the other end to the corresponding receiver (RX)
port on the Slave unit immediately below the Master.
Repeat this procedure with the second Cat5e cable.
CAUTION: Do not connect these ports to each
other on a single unit, and to not cross the
cables between the units.
Expansion I/O Ports (DANI Bus)
CODEC and TEL Remote Control Ports
Expansion Port Digital Audio Network Interface
Interconnection Diagram
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
LINE OUT
LINE OUT
LINE OUT
LINE OUT
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
LINE OUT
LINE OUT
LINE OUT
LINE OUT
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
LINE OUT
LINE OUT
LINE OUT
LINE OUT
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
PROGRAMMABLE
INPUTS/ OUTPUTS
1- GND
2- IN 12
3- IN 14
4- IN 16
5- IN 18
6- IN 20
7- IN 22
8- GND
9- OUT 9
10- OUT 11
11-OUT 13
12- OUT 15
13- GND
14- +5V
15- IN 13
16- IN 15
17- IN 17
18- IN 19
19- IN 21
20- +5V
21- OUT 10
22- OUT 12
23- OUT 14
24- OUT 16
25- +5V
- + - + - + - +- + - +- + - +
- + - + - + - +- + - +- + - +
TX
TXRX
RX
1- GND
2- IN 1
3- IN 3
4- IN 5
5- IN 7
6- IN 9
7- IN 11
8- GND
9- OUT 1
10- OUT 3
11-OUT 5
12- OUT 7
13- GND
14- +5V
15- IN 2
16- IN 4
17- IN 6
18- IN 8
19- IN 10
20- +5V
21- OUT 2
22- OUT 4
23- OUT 6
24- OUT 8
25- +5V
A B
EXPANSION
15 1613 14 17 18 19
3 41 2 5 6 7
LINE OUT
LINE OUT
LINE OUT
LINE OUT
MasterSlaveMasterSlave

DMTH4
LECTROSONICS, INC.
10
Control System Interconnections
In addition to a Windows®based computer system,
the DM84 can be controlled by external serial control
system using the RS-232 interface, such as those from
Crestron®and AMX®.
1: GND
2: IN 1
3: IN 3
4: IN 5
5: IN 7
25
13
14
16: IN 9
7: IN 11
8: GND
9: OUT 1
10: OUT 3
11: OUT 5
12: OUT 7
13: GND
14: +5V
15: IN 2
16: IN 4
17: IN 6
18: IN 8
19: IN 10
20: +5V
21: OUT 2
22: OUT 4
23: OUT 6
24: OUT 8
25: +5V
PROGRAMMABLE
INPUTS / OUTPUTS
RS-232
LecNet 2
USB
RS-232 Port USB Port
Two RS-232 serial cables are provided.
The cable with the BLACK TRS connector is an RS-
232 cable wired for use with a laptop computer system.
Black cable for
computer connection
The cable with the RED TRS connector is designed
to be used with a control system such as those from
Crestron®or AMX®.
Red cable for AMX and
Crestron control systems
NOTE: Crestron®is a trademark of Crestron
Electronics, Inc. AMX®is a registered trademark
of AMX Corp.
Wiring Diagram, 9 Pin D-Sub
Device to PC
3.5MM
Stereo Plug
9 or 25 Pin Female
D-Subminiature
S
R
T
1
2
3
4
5
6
7
8
9
LecNet Port
LecNet Device Transmit
LecNet Device Receive
Gnd
Tip
Ring
Sleeve
Host
Serial
Port
(PC)
N/C
N/C
Wiring Diagram, 25 Pin D-Sub
LecNet Port
LecNet Device Transmit
LecNet Device Receive
Gnd
Tip
Ring
Sleeve
3
2
7
1
4
5
6
20
CD
RX
TX
Gnd
RTS
CTS
RI
RX
TX
Sig Gnd
Chassis Gnd
RTS
CTS
Host
Serial
Port
(PC)
DTR
DSR
DSR
DTR
Device to AMX or Crestron
LecNet Port
AMX
or
Crestron
Port
1
2
3
4
5
6
7
8
9
LecNet Device Transmit
LecNet Device Receive
Gnd
RXD
TXD
Gnd
Tip
Ring
Sleeve
3.5MM
Stereo Plug
9 Pin Female
D-Subminiature
S
R
T
N/C
N/C
N/C
N/C
N/C
N/C
Part# 21529-1 (Black Cable)
Part# 21710-1 (Red Cable)

Installation Guide
Rio Rancho, NM 11
Installing LecNet2™Software and USB Driver
Software Installer - Windows Installation
The example shown her illustrates the installation pro-
cedure using a Windows operating system. The screens
that appear at each step using another operating sys-
tem will vary, but the general steps are very similar.
Download the LecNet2/DM Series Support software
installer from the web sites under the SUPPORT tab at:
http://www.lectrosonics.com/US
http://www.lectrosonics.com/europe/
1. Launch the installer and follow the screen
prompts.
Or use the flash drive supplied with the processor.
WDDISK
2. Follow the prompts to run the LecNet2 Setup
Wizard.

DMTH4
LECTROSONICS, INC.
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3. The End User License Agreement screen
appears. Click on I Agree to continue.
4. The installer will automatically download to a folder
on your PC, or you can choose which folder it
should be stored in.
5. Click on Next to complete the installation.
When the installation is complete, the confirmation
screen will appear.
USB Driver Installer - Windows Installation
The example shown her illustrates the installation pro-
cedure using a Windows operating system. The screens
that appear at each step using another operating sys-
tem will vary, but the general steps are very similar.
Download the LecNet2/DM Series USB drivers from the
web sites under the SUPPORT tab at:
http://www.lectrosonics.com/US
http://www.lectrosonics.com/europe/
1. Launch the installer and follow the screen
prompts.

Installation Guide
Rio Rancho, NM 13
WDDISK
Or use the flash drive
supplied with the
processor.
Navigate to the USB
folder and click on
AutoRun.
2. Click on Install USB Drivers (The installer will alert
you if you choose the wrong bit size.)
3. Follow the prompts to run the installer.
4. The End User License Agreement screen
appears. Click on I Agree to continue.
5. The installer will walk you through installation.
When complete, the final screen will appear. Click
on Finish to close the installation.

DMTH4
LECTROSONICS, INC.
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4) If the “Just a Reminder” dialog appears, click OK
to continue.
5) Click Connection on the Main Menu bar, then
select the type of connection between the computer
system or external control system and the DMTH4
unit. The choices are:
USB - used when the computer is connected to the
DMTH4 unit via the front or rear panel USB port.
Connecting to DMTH4 through USB
Basic System Setup
Control System Interconnections
In addition to a Windows®2000 or XP based computer
system, DMTH4s can be controlled by external serial
control system using the RS-232 interface, such as
those from Crestron®and AMX®.
Two RS-232 cables are provided. They are identified
by the color of the cable. The black cable is used to
connect a computer system to the DMTH4 and the red
cable is used to connect a serial control system such as
those from Crestron®or AMX®.
Warning: Do not use the black cable for
Crestron®or AMX®connections. It is strictly
for use with a WIndows® 2000 or XP computer
system.
Note: Crestron®is a trademark of Crestron
Electronics, Inc. AMX®is a registered tradename
of AMX Coporation.
Initial Setup
The initial setup of a DMTH4 system is a relatively
simple three step process: connect the unit to the
computer, turn on the computer and start the appropri-
ate control panel, preset the input, matrix and output
source. This process assumes that LecNet2™ and,
if necessary, the USB driver have been previously
installed. If they have not been installed, please refer to
Installing LecNet2™ Software and USB Driver.
1) Connect the computer system to the DMTH4 unit
using either the BLACK DB9 to stereo mini (TRS
1/8”) cable for RS-232 communications or the USB
cable for USB control. (Both cables are included
with the unit.)
Note: Only one DMTH4 unit at a time can be
connected to the computer system using a single
RS-232 cable. Multiple units may be connected
using multiple RS-232 cables, each attached to
a separate COM port on the computer system.
Multiple units may be connected using multiple
USB cables and multiple USB ports on the
computer system, or a USB hub attached to the
computer system.
2) Turn the computer system on. After the boot se-
quence is complete, turn on the DMTH4. When the
DMTH4 STATUS LED glows steadily, click Start,
then All Programs on the computer system
3) Select LecNet2, then select the control panel from
the list for the DMTH4 unit being set up.
USB Port
RS-232Port

Installation Guide
Rio Rancho, NM 15
Network - One or more DMTH4 devices may be made
available for network connections by connecting
them to a gateway computer system. A gateway
PC, or gateway server acts as a middleman,
receiving commands for a DMTH4 over a network
connection, and forwarding them to the DMTH4,
which is connected to it via USB. To work as a gate-
way server the PC must be a member of some local
area network (LAN) or the internet, by means of an
Ethernet connection, and be running the Lecnet2
“Net Server” program.
Extron IPL T S - One or more DMTH4 devices may be
made available for network connections by connect-
ing them to an Extron IPL T S ethernet control in-
terface. The IPL T S interface acts as a middleman,
receiving commands for a DMTH4 over a network
connection, and forwarding them to the DMTH4,
which is connected to it via an RS232 port. To work
as a gateway server the IPL T S interface must be
a member of some local area network (LAN) or the
Internet, by means of an Ethernet connection.
Serial->COM1 - An serial port for RS-232 communica-
tions between the DMTH4 and the computer.
Note: The control panel will list any COM ports
available on the computer system.
Serial->COM2 - Same as above.
Go Offline - No Connection Made, this mode can be
used to configure the DMTH4 off line and is the
default mode.
The DMTH4 can be configured on site or a configura-
tion file can be created in advance, then downloaded
into the unit in the installation. The minimum required
setup to pass audio includes: Inputs, Matrix and Out
Source. Input and output filters and compressors are
used to tailor the system for specific audio situations.
Master/Slave Configuration
When stacking multiple DM Series units, one unit is
always set as the Master and all subsequent units are
set as Slaves. The DMTH4 is normally configured as
a Slave unit and placed at the end of the DM Series
chain.
Inputs Matrix Out Source
The DMTH4 leaves the factory configured as a Master
unit to facilitate initial setup. If the unit has been con-
figured as a slave, it can be temporarily set to Master
mode via the front panel MODE button. If the front
panel MODE button is used, the unit will return to Slave
Mode the next time the DMTH4 power is cycled.
Using the DMTH4 Control Panel
to Change Master/Slave Mode
Changing the Master/Slave Mode can be easily accom-
plished through the DMTH4 Control Panel.
To do this, select Connect on the DMTH4 Control Panel
Menu Bar, then click “Connect >USB” to open the
“Select Lecnet2 Device” dialogue. Highlight the DMTH4
and click “OK.”
Connecting to DMTH4 through USB
POWERUSBSTATUSMODE
TELEPHONE HYBRID INTERFACE
R
MODE Button

DMTH4
LECTROSONICS, INC.
16
Setting Master/Slave Mode
WIth the DMTH4 connection configured, it is now
possible to set the Master/Slave operating mode. This
is done by selecting “Device Setup” from the Control
Panel Menu Bar. Select “Expansion Mode” from the
drop down menu and select “Slave.”
Initial Setup Hints
1) Right clicking the mouse is powerful in this inter-
face. You can activate quick access to a number
of setup functions (for example - right click in any
input box in the INPUTS tab). It also allows some
powerful cut and paste capabilities - especially in
the matrix setup and the filter (both input and out-
put).
2) Store startup settings in a startup default preset.
(See Storing and Recalling Presets in the online
HELP.)
3) Presets will take about 4 seconds to switch due to
the many parameters in the unit - audio will switch
off temporarily during a preset switch to avoid feed-
back. If you need quicker response with no inter-
ruption to the audio, use macros instead - try using
the macro recorder for making any changes. The
only changes that cannot be made in a macro are
filter adjustments.
4) Store presets after changes are made and not be-
fore they are made.
5) Help is always available by clicking Help on the
Main Menu Bar. This Help is a comprehensive
resource and includes the latest revisions to the
software and firmware.
IMPORTANT: Any changes made during setup
must be saved in the unit via the preset menu.
For direct support from the factory, call [phone]
Ask for anyone in the SALES department. They will be
able to answer your setup and/or technical questions or
will get the correct person who can help on the phone.

Installation Guide
Rio Rancho, NM 17
Example Teleconferencing Setup
The following information describes setting up a
DMTH4 to connect two locations for a conference. The
DMTH4 is designed to be part of a DM Series chain. In
this example, the DMTH4 is a slave unit to a DM1624
Series Automixer. This example also assumes that the
hardware has been installed and is operating properly.
Conceptually, the setup has two conference rooms,
each with two microphones and two ceiling mounted
speakers connected to a DM1624 in a Mix-Minus con-
figuration with a DMTH4 linking the rooms together via
a telephone connection. (See Link Conference Rooms
with a DMTH4, Example Setup.)
The actual process to create the signal path so all
members of both conference rooms have the ability to
hear and be heard all other members in the conference
rooms requires four simple steps: setting up the DMTH4
Main Matrix, setting up the DM1624 Main Matrix, set-
ting up the DM1624 Expansion Matrix and setting up
the DMTH4 Output Source Multiplexer. This is illustrat-
ed in Conference Room Signal Flow Diagram.
Link Conference Rooms with a DMTH4 Example Setup
Spkr 1
Spkr 2
Out 1
Out 2
X
X
XX
X
X
Main MatrixExp. Matrix
DM Series Automixer (DM1624 Shown)
In 1
In 2
In 3
In 16
DANI Bus
Mix Bus 1
Expansion Mix Bus 1
Expansion Mix Bus 2
Mix Bus 2 Mix Bus 3 Mix Bus 4 Mix Bus 5 Mix Bus 24
Out Source
Multiplexer
DMTH4
Main Matrix
(1) TEL IN
(2) CODEC IN
(3) AUX IN
(1) TEL OUT
(2) CODEC OUT
(3) AUX OUT
Conference Room Signal Flow Diagram

DMTH4
LECTROSONICS, INC.
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The following are assumed:
• A POTS line has already been connected to the
DMTH4 rear panel Telephone Line jack
• The DMTH4 has been connected to the DM1624
via the DANI bus
• The microphones and overhead speakers are
already connected to the DM1624 in a Mix-Minus
configuration.
The result will be that when a person talks into Mic 1 in
Conference Room 1, they will be heard both in Confer-
ence Room 1 and in Conference Room 2. Likewise, if
a person in Conference Room 2 talks into one of the mi-
crophones in that room, they will be heard both Confer-
ence Room 2 and Conference Room 1.
The following discusses setting up a DM Series consist-
ing of a DM1624 Digital Automixer and a DMTH4 Digital
Telephone Hybrid on near end of the telephone connec-
tion. The same process is used to set up the DM Series
at the other far end of the telephone connection.
Setting up the DMTH4 Main Matrix
The TEL Input needs to be configured so that it is con-
nected to DANI Bus Mix Busses 1 and 2. (See Confer-
ence Room Signal Flow Diagram.)
1.) Select the Matrix Tab in the DMTH4 Control Panel,
then select the “Main Matrix” sub tab. Right click the
TEL input to Mix Bus 1 crosspoint and select “En-
able Crosspoint” from the popup menu
2.) Repeat Step 1 for Mix Bus 2.
Setting up the DM1624 Main Matrix
The DM1624 Main Matrix needs to be configured so
the microphone inputs are connected to the output
channels used to drive the local sound reinforcement
speakers. These inputs will be mixed together with the
audio received from the DMTH4 TEL Input. Both local
audio and audio from Conference Room 2 are heard on
the speakers in Conference Room 1. (See Conference
Room Signal Flow Diagram.)
1.) Select the Matrix Tab on the DM1624 Control
Panel, then select the “Inputs to Outputs” sub tab.
2.) Right click the Input Channel 1 to Output Channel 2
crosspoint and select “Enable Crosspoint” from the
popup menu.
3.) Right click the Input Channel 2 to Output Channel 1
crosspoint and select “Enable Crosspoint” from the
list.
Setting up the DM1624 Expansion Matrix
Once the DM1624 Main Matrix has been set up, the
DM1624 Expansion Bus Matrix needs to be configured
so the local audio is sent back to the DMTH4 for dis-
tribution to the remote Conference Room (Conference
Room 2 in this example). (See Link Conference Rooms
with a DMTH4, Example Setup and Conference Room
Signal Flow Diagram.)
1.) Select the Inputs to Expansion Outputs Tab in the
DM1624 Matrix Tab.
2.) Right click the Input Channel 1 to Expansion
Out Channel 1 crosspoint and select “Enable
Crosspoint” from the popup menu.
3.) Right click the Input Channel 2 to Expansion Out
Channel 1 crosspoint and select “Enable Cros-
Matrix Tab
Input Channel 2 to
Output Channel 1
Input Channel 1 to
Output Channel 2
Inputs to
Outputs Tab
Click on Crosspoint Button
Setting up DMTH4 Main Matrix
Matrix Tab

Installation Guide
Rio Rancho, NM 19
The following procedures are designed to aquaint the
user of the basic steps required to set up a DMTH4
and provide a foundation for developing more complex
operations.
It is assumed that the LecNet2™ software and drivers
have been previously installed, a Windows-based com-
puter system is connected to the USB or RS-232 ports
and the DMTH4 Control Panel is open on the computer
screen.
Making a Phone Call
Telephone calls can be initiated from a wired remote
control, from a Window’s based computer system con-
nected to the DMTH4’s USB or RS-232 port, or from a
standard single-line telephone system attached to the
DMTH4 Telephone Set Jack.
Make a Telephone Call Using a Telephone Set
1.) Connect a telephone set to the rear panel Tele-
phone Set connector and a cable between the
telephone line and the rear panel Telephone Line
input connector.
2.) Click the DMTH4 Control Panel’s Activity tab.
3.) Use the telephone set to dial the desired number,
then click “Connect”. The LED will light, indicating
that DMTH4 telephone interface is connected and
the “Connect” button will change to “Disconnect.”
4.) Placing the telephone handset back on the cradle
automatically transfers all control to the DMTH4.
Basic System Operation
Connect Telephone Line Input Here
Connect Telephone Set Here
Connect LED
Connect
Inputs to
Expansion
Outputs Tab
Connect Input
Channels 1 and 2
to Expansion Out
Channel 1
Out Source Tab
TEL Output Source
spoint” from the popup menu.
Setting up the DMTH4
Output Source Multiplexer
The TEL output needs to be configured so that Expan-
sion Final Mix 1 is sent over the telephone line for use
at the remote Conference Room.
1.) Select the Out Source Tab in the DMTH4 Control
Panel.
2.) Click the down arrow on the TEL Output Source se-
lection list and select Exp Final Mix 1 from the list.

DMTH4
LECTROSONICS, INC.
20
Use the “Type the number to dial” box
1.) Click the “Type the number to dial” box, then use
the computer keyboard to enter the telephone
number. When finished, click “Dial” to connect the
telephone interface and dial the number.
2.) To terminate the telephone call, click the “Discon-
nect” button on the Activities tab.
Use the Phone Book
This procedure assumes that valid telephone numbers
have been entered into the DMTH4’s Telephone Book.
(The Tel/Codec tab is used to add or remove numbers
from the Telephone Book.)
1.) Click “Telephone Book” in the Activities tab.
2.) Select the desired telephone number from the list
and click “Dial” to connect the telephone interface
and dial the number.
Connect LED
Connect
“Type in Number to Dial” Box Dial
Connect LED
Connect
Telephone Book
5.) To terminate the telephone call, click the “Discon-
nect” button on the Activity tab.
Make a Telephone Call Using the Activity Tab
There are three ways to make a telephone call using
the Activity tab: the Touch Tone Pad, the “Type in the
Number to Dial” box or the Phone Book.
Using the Touch Tone Pad
1.) Click “Connect” on the Activity Tab. The Connect
LED will light and the “Connect” button will change
to “Disconnect.”
2.) Use the mouse to dial the desired telephone num-
ber.
3.) To terminate the telephone call, click the “Discon-
nect” button on the Activity tab.
Connect LEDDisconnectTouchTone Pad