Tech Works ICA-202D Specification sheet

Tech Works, Inc., 7430 Eastgate Road, Suite 130, Henderson, NV 89011
Direct Line: 702-846-1080 Toll Free: 1-800-813-1080
Web site www.tech4people.com 6/17
The ICA-202D is the most versatile Audio Intercom
available; yet it is also the easiest to integrate into
your design. With 20 watts of clean audio power at 25-
Volts it can do both the Intercom and the Paging
functions in most facilities. The audio quality of the
ICA-202D is superb. Noise and distortion are very low.
Selectable equalization optimizes voice
communications.
There are separate controls for Audio Level, and
Reach. Once set, Automatic Level Control (ALC)
assures the speaker level remains constant over a
wide dynamic input range. The Remote user may
wander throughout the room and still be heard at a
nearly constant level without any operator
adjustments.
A Privacy Tone, to alert the remote party that
someone is listening, is a control option. If selected
the privacy tone will sound every 20 seconds unless
the PTT is pressed.
The logic interface is PLC compatible. Control options
include Remote Operator Listen Level control from
push buttons or Touch Screen, Privacy Tone, Page,
PTT, Mute, Activate, Shut Off, and Call Tone, which is
automatically routed to the operator speaker. A Line
level output for recording is included. A separate Page
line level output provides audio to paging amplifiers if
required. A Page Pre-Announce Tone (jumper option)
is available.
All configuration settings are factory presets; only the
speaker levels are set in the field. The microphone
sensitivity (Reach) is set with 16 position (3dB/Step)
switches; the Speaker Levels are adjusted with Back
Panel Controls.
ICA-202D
TWO CHANNEL
AUDIO INTERCOM AMPLIFIER
OPERATION AND INSTALLATION MANUAL
Design Information:
Dual Channel Universal Audio Intercom Amplifier
Inputs: R.F. and static electricity protected
Outputs: short circuit protected
Frequency Response: 250 Hz to 10KHz
Remote Speaker Output:
Balanced 20-Watts RMS,Into 25 Volt transformer loads
Operator Speaker Output: 3 Watts into 25 Volt speaker
Distortion at Full Rated Output < 1% T.H.D
Microphone Inputs:
1000 Ohms Balanced
-80dBm minimum input for full rated output
Selectable Equalization optimized for voice
communication
Phantom Power: 23 Volts
Color: Light Gray metal enclosure
Power: 24VDC, 2A Power Supply (sold separately)
Unit is intended to be used with class 2 power source
Weight: 3 lbs.
Dimensions: 8.5” W X 1.75” H X 6” D
Mounting: Desk Mount (DM), Rack Mount (RM), Dual Rack
Mount (RM2), and Wall Mount (WM)
Connections: Euro-Style Pluggable Screw Terminals
BENEFITS
Fully Configurable
Easily Repeatable Settings
Digital Microphone Sensitivity
High Quality Audio
Automatic Level Control
External Reach Digital Stepper
Solid State Switch <3mS
Integral Privacy
Selectable Call Tones
Line Level Recording Output
Page Output
20 Watts Audio Power

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 2 of 32
How to use this Manual
Those wishing to use one of the standard Configuration Templates, should first read the
Overview, and then proceed to the appropriate Configuration Template for your application.
The Setup and Adjustments section should also be read before installation.
For those users who wish to do their own engineering, all sections may be useful. You may also
wish to contact a Tech Works application engineer for assistance.
Table of Contents
Page
Table of Contents 2
List of Illustrations 3
Overview 4
Functional Diagram and Explanation 5
Specifications 6
Mechanical Details 8
Front Panel Controls and Indicators 9
Rear Panel Connections 10
Simplified Block Diagram 12
Main Board Jumper Options 13
Universal Operator Microphone/Line Input 14
Remote EQ, Equalization 15
Paging Line Level Output 15
Monitoring Line Level Output 15
Call Tone Control 16
Level and Reach Setup and Adjustment 17
Paging Control 18
Integrated Systems Solutions 19
Operator “Reach”, Stepped Control 21
Application Templates 23
Mounting Options 31
Accessories 32

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 3 of 32
List of Illustrations:
Page
Functional Diagram 5
Mechanical Drawings 8
Front View 9
Rear View 10, 11, & 19
Simplified Block Diagram 12
PCB Jumper Locations 13
Audio Chain Block Diagram 17
Integrated System Block Diagram 19
Operator Reach Controls, Stepped Buttons 21
Basic Two Station Template 23
Basic Prison Intercom Setup 24
Basic Prison/PLC Interface Applications 25
Multi-Master Prison/PLC Intercom 26
Fiber Optic Cable Remote Audio 27
VOIP Interface to Remote Prison Cells 28
Dukane / Rauland Replacement 29
Intercom with Recording and Paging 30
ICA-202D-WM1 Single Wall Mount 31
ICA-202D-WM2 Dual Wall Mount 31
ICA-202D-RM1 Rack Mount 31
ICA-202D-RM2 Rack Mount 31
Accessories 32

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 4 of 32
Overview:
The ICA-202D is the audio heart of integrated services communications systems.
The ICA-202D is designed with the System Integrator in mind. The logic interface will function
well in a simple two-station setup. However, its strength is a robust logic interface that is ideal
for remote control from an external source such as a PLC, or computer, making integration into
larger systems easy.
The ICA-202D has jumpers and digital switches for application configuration. Once the settings
are determined, they may be set at the Factory, or in the Integrators Shop. Similar installations
use the same settings, so cloning additional ICA-202D's is simple.
Since all critical settings are predetermined, field setup is very easy
The ICA-202D has an External Stepped Control, which allows the Operator to eavesdrop on
conversations not intended for communication, and easily return to "Normal Communications"
settings. An audio limiter assures that even at the most sensitive settings, the Operator speaker
will never be overloaded.
Configuration Templates support common applications. If there is not a template for your
application, give us a call; we will be pleased to assist you to configure the ICA-202D into your
design.
The audio quality of the ICA-202D is superb. Noise and distortion are very low. Selectable
equalization optimizes voice communications. The Automatic Level Control assures optimum
performance, the audio level remains constant over a wide dynamic input range. The user may
wander throughout the room and still be heard at a nearly constant level.
The ICA-202D features true 25-Volt audio outputs, with excellent features for two-way
communications. 20 Watts of reserve output power allows for All-Call and Paging without the
use of auxiliary amplifiers, greatly simplifying systems design and reducing overall cost.
The ICA-202D features an integrated Call Tone and selectable Privacy Tone. These signals are
adjustable, independent of the audio communications settings.
Line level transformer isolated outputs are provided for Monitoring, or Paging. The Monitoring
Output has each side (Jumper Selectable) of the conversation mixed to a single output ideal for
recording. The Paging Output is only present when the Page Switch is active, eliminating the
need for an external relay.
Modular Construction makes the ICA-202D ideal for integrated designs. The unit is small;
mounting is flexible and easy. Power is from a Universal Plug-in DC power adapter or screw
terminals for connection of any regulated 24VDC-2A Power Supply. All I/O is through Euro-Style
connectorized barrier strips. Unit is intended to use with class 2 power source.

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 5 of 32
ICA-202D Functional Diagram
Each channel has its own audio control section, which provides
Automatic Gain Control, Amplifier Muting, and other functions.
The ICA-202D is configured for Remote Station(s) to be a 25-Volt speaker.
The Operator has a separate microphone and speaker.
The Logic Control section provides for complete control of the audio functions.
A muting input is provided to mask station switchover noise.
Call, Privacy, and Paging Pre-announce Tones are included to simplify the
external systems design.

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 6 of 32
Specifications
General:
Dual Channel Universal Audio Intercom Amplifier
Inputs: R.F. and static electricity protected
Outputs: short circuit protected
Frequency Response: 250 Hz to 10 KHz
20-Watts RMS Sine Wave output, 25 Volts (Balanced)
Distortion at full voltage output < 1% T.H.D.
Power Supply Required: 24 Volts DC @ 2.2 Amps for full rated output
Unit is intended to use with class 2 power source
Operator Microphone/Line Universal Input:
2000 Ohms Balanced
As Microphone -70dBm minimum input for full rated output
Selectable Equalization, 3 settings optimized for voice communication
Phantom Power, short circuit protected (23 Volts, Current limited @ 9 MA)
As Line Input, -25dBm to + 20dBm
Remote Microphone (Also used as the Remote Speaker) Input:
1000 Ohms Balanced
-80dBm minimum input for full rated output
Selectable Equalization, 3 settings optimized for voice communication
Operator Speaker Output:
Balanced
25-Volts, Built out with 66 Ohms
Operator Speaker, 2.25-Watts @ 45 Ohms
Or 25-Volt Speaker tapped at ~2 Watts (See page 15)
Remote Speaker Output:
Balanced
25-Volts, 20-Watts (Maximum)
Automatic Level Control:
Operator and Remote
Greater then 40dB Automatic level accommodation
Fast Attack, <10 mS
Feed Forward Control, no ‘Pumping’
Adjustable 'Reach' (Sensitivity)

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 7 of 32
Paging Line Level Output:
600-Ohm, Balanced, Transformer Coupled
Processed by Automatic Level Control, for ~0dBm output
Operator Microphone, Keyed by Page Switch
(Recording) Line Level Output:
600-Ohm, Balanced, Transformer Coupled
Processed by Automatic Level Control, for ~0dBm output
Active Channel, Operator Microphone, and/or Remote Speaker-Microphone
Call Tone:
Uses Operator Speaker
Selectable, Edge or Level Triggered
Latched, of Momentary Control
Adjustable Level
Selectable Tone Character: Constant; Intermittent; Warble
Privacy Alert Tone:
Uses Remote Speaker
Enabled by Switch Input
Two hundred-millisecond tone burst
Privacy Alert Tone on Activation
Periodic Privacy Alert Tone, if Eavesdropping
Adjustable Level
Paging Pre-Announce Alert Tone:
Uses Paging Line Level Output
Selectable: Enable, Disable
Two hundred-millisecond tone burst
Keyed when Paging Switch is activated
Adjustable Level

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 8 of 32
Mechanical and Electrical
1U, Half Rack, 8.60” X 1.75” X 6.00”
Mounting Options: Table-Top; Under Counter; Rack
Approximately 3 lbs
Modular aluminum and steel enclosure
Euro-Style connectorized barrier strips
24 Volts D.C. 24-Watts Maximum, 50 Watts
Unit is intended to use with class 2 power source
LEFT SIDE FRONT RIGHT SIDE
RACK MOUNT
RM-1

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 9 of 32
FRONT PANEL CONTROLS AND INDICATORS
Front Panel Audio Controls:
Operator ‘Reach’ (Remote Microphone Gain)
16 Position Switch, 3dB/step
Sets preamplifier sensitivity for Normal Microphone input level
Remote ‘Reach’ (Operator Microphone Gain)
16 Position Switch, 3dB/step
Sets preamplifier sensitivity for Normal Microphone input level
Front Panel Indicators:
Power
Off, when no power
Green when operating normally
Operator Active
Green when Operator Listening
Operator Reach (Remote Microphone Level)
Off when Microphone not Active
Green when Microphone Active
Flashes Red when Audio is Present (Threshold of Limiting)
Page (From Operator Microphone)
Green when Operator is 'Paging'
Remote Active
Green when Remote Listening
Remote Reach (Operator Microphone Level)
Off when Microphone not Active
Green when Microphone Active
Flashes Red when Audio is Present (Threshold of Limiting)
REMOTE
ACTIVE
DUAL CHANNEL
INTERCOM AMPLIFIER
POWER
ICA-202D
THRES
REACH PAGE ACTIVE REACH
OPERATOR
THRES

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 10 of 32
REAR PANEL CONNECTIONS
Logic Control Inputs:
Common sensing for Switches, or PLC
Privacy Tone Enable Sw - Active low, momentary, or sustained
Enables Privacy Tone burst temporarily forcing the Remote Speaker on
The Privacy Tone is initiated when the Intercom is activated
Or when the Intercom is un-muted
Activation from “Push to Talk” or "Page" does not sound the Privacy Tone
The tone burst also sounds every 18-20 seconds if there is continuous listening
Page Sw - Active low (Same functions as PTT)
Causes "Page Out output to carry the Operator Microphone audio signal
This Page Switch Input is diode isolated, so a relay powered +24Volts may also connect
to the same point (The Relay Coil must also have an Anti-Fly Wheeling Diode)
Push to Talk (PTT) Sw - Active Low, momentary or sustained
Forces the Remote speaker on while depressed (Sustained)
Cancels “Call Tone” (Jumper Option)
Activates the Intercom if Inactive
Does not cause the Privacy Tone to be sent
Mute Sw (Highest Priority) – Active Low, momentary, or sustained
Causes both channels to mute
Does not change the state Active or Call Flip-Flops
Sounds Privacy Tone when un-muting (Jumper Option)
Activate Sw - Active Low, momentary, or sustained
Overrides “Shut Off”
Quiescent state, Operator on
Cancels Call Tone (Jumper Option)
Cause Privacy Tone to be sent (Jumper Option)
Shutoff Sw (Lowest Priority) - Active low, momentary, or sustained, see below
Disables both Operator and Remote Speakers
(Overridden by “Activate”, “Push to Talk”, or "Page")
Call Sw - Active low, momentary, or sustained
Causes “Call Tone” to be sent to the Operator speaker
OP MIC (-)
REM SPKR (+)
REM SPKR (-)
OP MIC (+)
OP SPKR (-)
COMMON
OP SPKR (+)
COMMON
PAGE OUT (-)
PAGE OUT (+)
24VDC-2A
P-TONE SW
PTT SW
PAGE SW
ACTIVATE SW
MUTE SW
SHUT OFF SW
CHASSIS
+24VDC
COMMON
ICA-202D
Tech Works * YORBA LINDA * CA * 1-800-813-1080 * WWW.TECH4PEOPLE.COM
CALL SW
OP EXT DN
COMMON
OP EXT UP
COMMON
LINE OUT (+)
LINE OUT (-)
OPERATOR
LEVEL
ACTIVE ACTIVE
LEVEL
REMOTE
POWER

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 11 of 32
Back Panel Audio Controls:
Remote Speaker ‘Level’
Control TrimPot; set for desired listening level
Operator Speaker ‘Level’
Control TrimPot; set for desired listening level
Back Panel Indicators:
Power
Off, when no power
Green when operating normally
Remote ‘Active’, Green when Remote Listening (Operator Talking)
Operator ‘Active’, Green when Operator Listening
External Operator (Extended) Reach Control:
Two Active low, momentary, (Or sustained) inputs
16 Position stepped control, with "UP" and "DN" pulsed inputs
"UP" extends "Reach" (Increases Microphone Sensitivity above Normal level)
"DN" returns "Reach" toward Normal sensitivity
(If not used, the ICA-202D powers up to the "Normal" setting)
OP MIC (-)
REM SPKR (+) REM SPKR (-)
OP MIC (+)
OP SPKR (-)
COMMON
OP SPKR (+)
COMMON
PAGE OUT (-)
PAGE OUT (+)
24VDC-2A
P-TONE SW
PTT SW
PAGE SW
ACTIVATE SW
MUTE SW
SHUT OFF SW
CHASSIS
+24VDC
COMMON
ICA-202D
Tech Works * YORBA LINDA * CA * 1-800-813-1080 * WWW.TECH4PEOPLE.COM
CALL SW
OP EXT DN
COMMON
OP EXT UP
COMMON
LINE OUT (+)
LINE OUT (-)
OPERATOR
LEVEL
ACTIVE ACTIVE
LEVEL
REMOTE
POWER

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 12 of 32
Simplified Block Diagram
ACTIVE
F-F
OR
AND
OR
ACTIVE
ACTIVE+CALL
OR
OR
LISTEN
TALK
PAGE
CHANGOVER
SEQUENCER
TALK, 10MS
RETURN FROM TALK, 200MS
ENABLE
TALK
RESET
SET
CALL_TONE_ON
PTT
PAGE_SW
PTT_SW
A-TONE_ON
ACTIVE+CALL
MUTE_SW
SHUTOFF_SW
ACTIVATE_SW
PTT ACTIVE_F-F_ON
~200MS
CALL TONE GENERATOR
CALL_TONE
CALL_TONE_ON
WARBLE
INTERMITTENT
CONTINUOUS
0dB, HIGH
-6dB, MEDIUM
-12dB, LOW
CALL TONE
CONTROL
CALL_SW
PTT
ACTIVE_F-F_ON
CANCEL
EDGE
LEVEL
LATCH
NON-LATCH
A-TONE
O/S A-TONE_ON
PRIVACY
TONE TIMER
OR
PAGE PAGE PRE-ANNOUCE TONE
OR RESET
PTT
ACTIVE
PTONE_ENB_SW
~18 SECONDS
REPEATING ~200MS
ALERT TONE GENERATOR
A_TONE
0dB, HIGH
-6dB, MEDIUM
-12dB, LOW
PAGE
MUX
LINE
OUT
MUX
LINE
OUT
MUX
AMP PAGE OUTPUT
SUM LINE OUTPUT
OP_SOURCE
OP_SOURCE
REM_SOURCE
PAGE
TALK
LISTEN
REMOTE SPEAKER
INPUT/OUTPUT
AND
PRE-AMP
OPERATOR
MICROPHONE
OR
LINE INPUT OP_SOURCE
SUM
A_TONE
“REMOTE
LISTEN”
LEVEL”
PWR-AMP
AND
TALK
A-TONE_ON
TALK
PAGE
MUTE REMOTE SPEAKER
WHILE PAGING
OPERATOR
ALC
OP
MIC/LINE
GAIN
8
7
6
2
1
0
F
E
A
9
OPERATOR SPEAKER
REMOTE SPEAKER
INPUT/OUTPUT PRE-AMP
REM_SOURCE
SUM
C_TONE
“OPERATOR
LISTEN”
LEVEL”
PWR-AMP
LISTEN
LISTEN
OP_REACH_UP_SW
OP_REACH_DWN_SW
REMOTE
ALC
REM
MIC
GAIN
8
7
6
2
1
0
F
E
A
9

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 13 of 32
Jumper Options (Refer to the Block Diagram for Jumper Function)
ICA-202D-3 PCB Jumper Locations
Factory Default Positions Shown

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 14 of 32
Universal Operator Microphone/Line Input
This input can accommodate a wide range Microphone or Line inputs
The Microphone Sensitivity is adjustable with the 16 Position Rotary Switch
With ~3db/Step for a 45 dB range
By using the Gain Switch, and Jumper options the total Range is -65dB to +20dB
The Signal is processed with an ALC, to assure the Output never exceeds 0dBm
Indicators allow the Microphone Gain to be adjusted to the optimal level
Phantom Power:
Terminating Resistors referenced to +23Volts, Current limited @ 7MA , ON
Terminating Resistors connected to Common, OFF
Gain Range:
Input Gain reduced 15dB, LO
Full Gain, HI
EQ Jumpers (Two):
Both Jumpers, upper position, lowest frequency Roll-off
(Used with most gooseneck and Hanging microphones)
Only MED CUT Jumper Upper Position, Medium frequency Roll-off
(Used with most flush mounted microphones)
Only HI CUT Jumper Upper Position, Highest frequency Roll-off
(Used with most Speakers used as a microphone)
Both Jumpers Lower Position, (Line Input)
~170Hz Roll-off, Sensitivity reduced to –25dBm input for full Output
Notes:
If the Limiting occurs with the Stepped Gain Control on ”0”, “1” or ”2”
There is insufficient Headroom, use the “LO” Gain Range
For a Balanced Line Level Input the LO Gain Position is also used
The Accommodation Range for full output is ~ -10dBm to +20dBm (With 10dB of Headroom)

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 15 of 32
Remote EQ, Equalization:
EQ Jumpers (Two):
Both Jumpers, upper position, lowest frequency Roll-off
(Used with most gooseneck and Hanging microphones)
Only MED CUT Jumper Upper Position, Medium frequency Roll-off
(Used with most flush mounted microphones)
Only HI CUT Jumper Upper Position, Highest frequency Roll-off
(Used with most Speakers used as a microphone)
Both Jumpers Lower Position, (Line Input)
~170Hz Roll-off, Sensitivity reduced to –25dBm input for full Output
Paging Line Level Output:
The Operator Microphone Output is routed to the Paging Line Level Output
when the Page Switch is active
The Internal Remote Amplifier may be active or muted during a Page
Remote Speaker Carries Page Un-Mute
Remote Speaker Muted during Page Muted
A 200mS Pre-Announce Tone burst may precede the Page
Send Pre-Announce Tone ON
No Pre-Announce Tone OFF
Pre-Announce Tone Level
0dBm (Same level as Communications) HI
-6dB MED
-12dB LO
Monitoring Line Level Output:
Jumpers to select the Signal Sources
Operator Speaker sources, Remote Microphone and Call Tone
Routed ON
Not Routed OFF
Remote Speaker sources, Operator Microphone, Privacy, and Paging Pre-Announce,
Tones
Routed ON
Not Routed OFF

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 16 of 32
Call Tone Control
The three sets of Call Tone jumpers accommodate many control schemes
The Call Tone sounds through the Operator Speaker
The Call Switch may be internally latched (Jumper Option) using the internal register
Or the Call signal may be controlled by an External Controller (Jumper Option)
When the external controller is used the state of the Intercom is ignored, and the Call
signal sounds whenever the 'Call Switch' is low (The Jumper selection for Level
Triggered is used)
If the Call Switch request is latched (Jumper Option),
only a momentary closure of the Call switch is required.
When the Intercom becomes Active (Jumper Option), the Call Tone is canceled.
If the Call Switch is pressed while the Intercom is Active it is ignored.
When the PTT Switch is pressed (Jumper Option), the Call Tone is canceled.
If the Call Switch is pressed while the Intercom is Active the Call Tone will sound.
When the Call Switch is ‘edge triggered’ (Jumper Option) the normal setting, the Call
Tone switch must be released and re-pushed while the intercom is inactive (Jumper
Option) to cause a new call tone to sound. This option is helpful if the Remote Station
user is in a panic, and will not release the Call Switch.
When the Call Switch is ‘level triggered’ (Jumper Option), the Call Tone will sound
whenever the Call Tone switch is closed and the intercom becomes inactive (Jumper
Option)
Call Tone Configuration Jumpers:
Edge Triggered Call Tone ON
Level Triggered Call Tone OFF
Momentary control by external PLC, Edge Trigger=OFF Non-Latched
Use the internal Registers to sustain the call Latched
When Internal Register Sustains Call (No affect in Non-Latched)
Call Cancelled by ACTIVE State
Call Cancelled by PTT Switch
Call Tone Level
0dBm (Same level as Communications) HI
-6dB MED
-12dB LO Setup Adjustments

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 17 of 32
Level and Reach Setup and Adjustment:
ICA-202D Audio Chain Block Diagram
The ICA-202D has two adjustments for the audio, for each Channel, ‘Reach’ and ‘Level’.
Once they are setup, these settings should never need to be adjusted by the user.
The Limiter Threshold is fixed; no matter how great the input level becomes the output level will
not exceed the ‘Limiting Level’ (0dBm)
The ‘Reach’ Control sets the microphone gain. The greater the ‘Reach’ the fainter the input level
that can be heard, and of course the greater the background noise!
The ‘Reach’ is set for normal communications, to be approximately 6 dB into limiting. This
allows the user to move throughout the room, while maintaining an almost constant output level
from the limiter
Setup is accomplished with the use of an Assistant (best) or a Radio, or other sound source.
The sound source should be set at the normal expected level, and position, of the User
Setup each direction, one at a time:
For both Channels, (If the External Reach Control is not being used):
First setup the "Reach" (Pre-limiter, Microphone Gain)
Set the Reach Control to the minimum level, (Red dot, at 6 O'clock position).
Then advance the control CW, one step at a time, until the "Threshold" indicator just flashes.
Then advance control two more clicks (6dB into limiting)
Then set the (Post-limiter, Power Amplifier) Speaker "Level"
Advance the "Level" control CW for the desired listening level
It is not recommended setting the level control into the red dots
If a greater output level is desired, a higher wattage speaker tap is recommend
If the "External Reach Control" is used, it must first be set to the "Normal" Setting
This can be done by Power Cycling the ICA-202D, or by pressing (And Holding) the
"Down/Normal" Switch for approximately 4 Seconds
Then adjust the "Operator Reach" (Pre-limiter, Microphone Gain to the "Normal" setting)
Set the Reach Control to the minimum level, (Red dot, at 6 O'clock position).
Then advance the control CW, one step at a time, until the "Threshold" indicator just flashes
Do not advance the control beyond that point
Next, set the (Post-limiter, Power Amplifier) Speaker "Level"
Advance the "Level" control CW for the desired listening level

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 18 of 32
Call Tone Level:
The Call Tone signal comes through the Operator’s speaker.
This adjustment should be made after Communications levels are set.
The Call Tone level has three Steps, "HI", "MED", "LO"
Setup is accomplished by activating the ‘Call Tone’ by pushing the ‘Call’ Switch.
Select a suitable Call Tone level.
Privacy Tone Level:
(Note: the Privacy and Page Preannounce Tones share the same "Level" setting)
The Privacy Tone signal comes through the Remote speaker.
This adjustment should be made after Communications levels are set.
The Privacy Tone level has three Steps, "HI", "MED", "LO"
(The Privacy Tone must be enabled, "P-TONE-ENABLE" tied to COMMON)
Setup is accomplished by performing a sequence that causes a Privacy Tone
First push and release the ‘Shut Off’ Switch, then push the ‘Activate/On’ Switch.
The Privacy Tone will sound briefly. If your system does not have a push to ‘Activate/On’
Switch the Privacy Tone will sound briefly every 18 seconds when the Intercom is active.
Select a suitable Privacy Tone level.
Page Pre-announce Tone Level:
(Note: the Privacy and Page Preannounce Tones share the same "Level" setting)
The Page Pre-announce Tone comes through the Page Line Level Output
The Privacy Tone level has three Steps, "HI", "MED", "LO"
The Page Preannounce Tone, (Jumper Option) must be "ON"
Press the Page Switch; the Preannounce tone will sound
Select a suitable Page Pre-announce Tone Level
Paging Control:
Paging is Handled similarly to PTT, with additional Jumper Options:
There is a 200ms Pre-Announce Tone ON
There is No Pre-Announce Tone OFF
The (Internal) Remote Speaker Amplifier is Disabled during a Page MUTE
The (Internal) Remote Speaker Amplifier is Enabled during a Page UNMUTE

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 19 of 32
Integrated System Solutions
REMOTE
SPEAKER/
MICROPHONE
OPERATOR
MICROPHONE
AUDIO
CONTROL
CONTROL
LOGIC
CALL SW
SHUT OFF SW
ACTIVATE SW
MUTE SW
PTT SW
PAGE SW
P-TONE ENABLE SW
AUDIO
CONTROL
PWR-AMP
PRE-AMP
PWR-AMP PRE-AMP
OPERATOR
SPEAKER
The ICA-202D provides a complete audio and logical interface for an integrated systems
solution. In most applications the Remote Speaker is accessed through a Switching Matrix,
controlled by a computer, or PLC.
The Operator microphone may be either a Dynamic, or Condenser type.
The Microphone is balanced and may be Phantom Powered.
If a flush mounted microphone is required, the Tech Works HM-1 is recommended
The Operator Speaker output is optimized for 100-Ohm voice coil speakers.
The Maximum Output is 25-Volts. Internally, the output is built out with a 66-Ohm resistance.
A 45-Ohm, 2.2-Watts voice coil or higher impedance is acceptable.
A 25-Volt speaker tapped at 5 watts or less is also acceptable.
OP MIC (-)
REM SPKR (+) REM SPKR (-)
OP MIC (+)
OP SPKR (-)
COMMON
OP SPKR (+)
COMMON
PAGE OUT (-)
PAGE OUT (+)
24VDC-2A
P-TONE SW
PTT SW
PAGE SW
ACTIVATE SW
MUTE SW
SHUT OFF SW
CHASSIS
+24VDC
COMMON
ICA-202D
Tech Works * YORBA LINDA * CA * 1-800-813-1080 * WWW.TECH4PEOPLE.COM
CALL SW
OP EXT DN
COMMON
OP EXT UP
COMMON
LINE OUT (+)
LINE OUT (-)
OPERATOR
LEVEL
ACTIVE ACTIVE
LEVEL
REMOTE
POWER

06/29/17 ICA-202D OPERATION AND INSTALLATION MANUAL Page 20 of 32
The Remote Speaker(s) should be 25 Volt units, tapped at 2.5 Watts or less.
Since the remote speakers are also used as microphones, all remote speakers on the system
that are used for two-way communications should Similar, and be tapped the same.
It is assumed that two-way communications only takes place to one remote speaker at a time.
Speakers that are only used for paging may be tapped to any power level up to 20 Watts. It is
important that in any paging application that the total load not exceed 20 Watts.
The logic interface is ideal for external control with features designed to ease system
integration.
The ICA-202D has two Flip-Flops, one for Activation, and the other for the Call function. These
Flip-Flops are configured so that the external Control Inputs can override the internal states.
If the Shut Off input is tied to Common, Activation follows the Active input, which is ideal for
external use with an external controller
The internal Call Flip-Flop may be used, or bypassed for use by an external controller.
If the internal Call Flip-Flop is bypassed, the Call Switch input should also be set to
non-edge triggered. The Call Switch input is then sustained to cause the Call Tone to Sound.
When the Internal Call Tone Flip-Flop is used several control variations are possible.
The Call input may be configured as Edge Triggered or Level Triggered. For PLC operation this
determines whether the interface will respond to a Call Input that is pending when the Intercom
becomes inactive. In some applications any pending call should be sounded immediately. In
some systems the operator may be switching from one Station to another and not want to be
annoyed by pending calls, just new calls, when the Intercom is inactive.
Calls may either be cancelled by the Intercom being Active, or only by pressing PTT.
When the Active jumper option is chosen, a Call is ignored if the Operator is
Listening or Talking.
When PTT jumper option is used, the Call Tone will sound even if the Operator is listening.
The Call can only be cancelled by the Operator acknowledging the Call, by talking to the
Remote Station.
The ICA-202D has a separate Mute input. The Mute Input affects both channels of the intercom;
however, it does not change the activation state. The mute does affect the
Call Flip-Flop. Mute has the highest priority. When muted, all signals to both Speakers are
squelched. The mute signal is necessary on some systems to allow the Remote Speaker to
switch to a new Station without causing pops in the Operator Speaker. Mute would momentarily
be employed during switching while ‘Listening’ or returning to the ‘Listening’ state.
The PTT (Push to Talk) input activates the Intercom. If the Shut Off input is tied to common,
then PTT only activates the intercom while the signal is asserted.
The Page input has the same functionality as the PTT input, with added features.
The internal Remote Power Amplifier may be enabled, or disabled during a page.
The Operator Microphone is keyed to the Line Level Output.