GAI-Tronics ACC2500 Operating manual

Pub. 42004-417A
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: [phone]
VISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model ACC2500 Audio Control Center
User and Installation Manual

09/08 Pub. 42004-417A ii
CONFIDENTIALITY NOTICE
This manual is provided solely as an operational, installation, and maintenance guide and contains sensitive
business and technical information that is confidential and proprietary to GAI-Tronics. GAI-Tronics
retains all intellectual property and other rights in or to the information contained herein, and such
information may only be used in connection with the operation of your GAI-Tronics product or system.
This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any third party.
COMPUTER SOFTWARE COPYRIGHTS
This product contains copyrighted computer programs stored in semiconductor memory. These programs
are copyrighted by GAI-Tronics Corporation and may not be reproduced in any form without express
written permission from GAI-Tronics.
WARRANTY
GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any GAI-Tronics equipment supplied
hereunder shall be free of defects in material and workmanship, shall comply with the then-current product specifications and
product literature, and if applicable, shall be fit for the purpose specified in the agreed-upon quotation or proposal document. If
(a) Seller’s goods prove to be defective in workmanship and/or material under normal and proper usage, or unfit for the
purpose specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above, Buyer may return
such goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time they will be repaired or replaced, at
Seller’s option, without charge to Buyer. Repair or replacement shall be Buyer’s sole and exclusive remedy, and the warranty
period on any repaired or replacement equipment shall be one (1) year from the date the original equipment was shipped. In no
event shall GAI-Tronics’ warranty obligations with respect to equipment exceed 100% of the total cost of the equipment
supplied hereunder. The applicability of any such third-party warranty will be determined solely by GAI-Tronics.
Services. Any services GAI-Tronics provides hereunder, whether directly or through subcontractors, shall be performed in
accordance with the standard of care with which such services are normally provided in the industry. If the services fail to meet
the applicable industry standard, GAI-Tronics will, for a period of one (1) year from the date of completion, re-perform such
services at no cost to the Buyer. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall
GAI-Tronics’ warranty obligations with respect to services exceed 100% of the total cost of services provided hereunder.
Limitations/Exclusions. The warranty on any equipment supplied hereunder is subject to Customer’s use in compliance
with applicable FCC regulations and manufacturer specifications. The warranties herein shall not apply to, and GAI-Tronics
shall not be responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent caused by
accident, misuse, abuse, neglect, system design, product modification, failure to follow instructions contained in the product
manual, repair, or attempted repair by anyone not authorized by GAI-Tronics, improper installation, installation of parts that do
not conform to the qualityor specifications of the original parts or accessories, damage or loss occurred during shipment, or any
unit which is not new when sold or upon which the serial number has been defaced, modified or removed. The warranty does
not extend to damage incurred by natural causes including Force Majeure. The warranty does not cover microprocessors if
failure is due to static damage or application of improper voltage. THE WARRANTIES AND REMEDIES
CONTAINED HEREIN ARE IN LIEU OF AND EXCLUDE ALL OTHER WARRANTIES AND REMEDIES,
WHETHER EXPRESS OR IMPLIED BY OPERATION OF LAW OR OTHERWISE, INCLUDING ANY
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Operational and Maintenance Procedures.Buyer acknowledges that any improper use, maintenance, or
modification of the equipment provided hereunder, or use of unqualified maintenance or service technicians will severely
impair the operational effectiveness of the entire communication system. Buyer hereby agrees to indemnify, defend and hold
GAI-Tronics harmless from and against any and all third partyclaims arising, in anymanner, out of: (a) Buyer’s neglect of the
equipment; (b) Buyer’s use of technicians not authorized by GAI-Tronics to service the equipment; or (c) Buyer’s improper use
or modification of the equipment or failure to follow the operational and maintenance procedures provided with the equipment.
Limitation of Liability/Damages.In no event (even should circumstances cause the exclusive warranties and remedies
set forth in the Warranty section to fail of their essential purpose) shall either party be liable for any indirect, incidental, special
or consequential damages (including, but not limited to, loss of use, loss of anticipated profits, or damages arising from delay)
whether such claims are alleged to have arisen out of breach of warranty, breach of contract, strict or absolute liabilityin tort,
or other act, error or omission, or from any other cause whatsoever, or any combination of the foregoing.

09/08 Pub. 42004-417A
iii
Table of Contents
FOREWORD .......................................................................................................................................................1
SCOPE OF MANUAL..............................................................................................................................................1
NOMENCLATURE................................................................................................................................................. 1
ORDERING REPLACEMENT PARTS.........................................................................................................................1
SERVICE AND REPAIR ..........................................................................................................................................1
FCC INTERFERENCE WARNING............................................................................................................................1
SAFE HANDLING OF CMOS INTEGRATED CIRCUIT DEVICES ..................................................................................2
DESCRIPTION....................................................................................................................................................3
FEATURES AND BENEFITS ....................................................................................................................................3
INTRODUCTION TO THE ACC2500 AUDIO CONTROL CENTER................................................................................4
SYSTEM COMPONENT REFERENCES......................................................................................................................4
DESK SET BUTTON PANEL ................................................................................................................................... 5
INTERNAL MICROPHONE AND SPEAKER ................................................................................................................6
HANDSET............................................................................................................................................................6
CONNECTORS......................................................................................................................................................7
Power Connector...........................................................................................................................................7
AMI Connections........................................................................................................................................... 7
ACCESSORIES,AND OPTIONS AND KITS ................................................................................................................ 9
PERFORMANCE SPECIFICATIONS......................................................................................................................... 10
OPERATION..................................................................................................................................................... 11
DISPLAY ........................................................................................................................................................... 11
IDLE MODE....................................................................................................................................................... 12
ZONE SELECTION .............................................................................................................................................. 12
INITIATING LIVE VOICE BROADCASTS WITHOUT AN ALARM ................................................................................ 13
Handset Transmit ........................................................................................................................................ 14
Transmit from Internal (Local) Microphone................................................................................................. 14
Transmit from Desk Microphone or Footswitch ........................................................................................... 14
ALARM SELECTION ........................................................................................................................................... 15
INITIATING ALARM BROADCASTS WITHOUT VOICE ............................................................................................. 16
STOPPING THE BROADCAST OF AN ALARM.......................................................................................................... 17
STOP/CLRVS.DEACT.................................................................................................................................... 17
INITIATING LIVE VOICE BROADCAST DURING AN ALARM BROADCAST ................................................................. 18
OVERDIALING DTMF........................................................................................................................................ 18
PROGRAMMABLE BUTTONS................................................................................................................................19
VOLUME UP AND VOLUME DOWN BUTTONS ................................................................................................. 19
COMBINATION BUTTON OPERATION................................................................................................................... 20
TIME BUTTON ................................................................................................................................................. 20
INSTALLATION............................................................................................................................................... 21
PLANNING THE INSTALLATION........................................................................................................................... 21
Mounting..................................................................................................................................................... 22
FCC Interference Warnings......................................................................................................................... 22
Electrostatic Discharge (ESD) Protection.................................................................................................... 22
Cable Installation Safety Considerations..................................................................................................... 23
POWER CONNECTION ........................................................................................................................................ 23
AUDIO AND DATA CONNECTION ........................................................................................................................ 23
MICROPHONE SENSITIVITY ADJUSTMENTS ......................................................................................................... 24
Internal Microphone Sensitivity................................................................................................................... 24
Handset Microphone Sensitivity................................................................................................................... 24
LEVEL ADJUSTMENTS AND DIAGNOSTICS ........................................................................................................... 25
Programming Menu..................................................................................................................................... 25

Table of Contents ACC2500 Audio Control Center
09/08 Pub. 42004-417A iv
Reloading Factory Defaults......................................................................................................................... 25
Main Diagnostics Selection ......................................................................................................................... 26
PB1 – Line Output Adjust............................................................................................................................ 26
PB2 - Line-In Sensitivity.............................................................................................................................. 27
PB3 – Internal Diagnostics.......................................................................................................................... 28
PB1 – RelayModule Diagnostics..............................................................................................................................28
PB2 – Toggle Backup Mode......................................................................................................................................28
PB3 – RS-232 Diagnostic..........................................................................................................................................28
PB4 – Keyboard Diagnostic......................................................................................................................................29
PB4 – Tone/Alarm Diagnostics.................................................................................................................... 29
PB1 – Sidetone Level Adjust Mode...........................................................................................................................29
PB2 – DTMF Level Adjust Mode .............................................................................................................................30
PB3 –AMI Message Diagnostics...............................................................................................................................30
Time Setting................................................................................................................................................. 30
THEORY OF OPERATION .............................................................................................................................31
GENERAL DESK SET OVERVIEW ......................................................................................................................... 31
RECEIVE AUDIO ................................................................................................................................................ 31
SPEAKER AUDIO................................................................................................................................................ 31
TRANSMIT AUDIO ............................................................................................................................................. 32
MICROPHONE AUDIO......................................................................................................................................... 32
RELAY CONTROL MODULE ................................................................................................................................32
RESET CIRCUIT ................................................................................................................................................. 32
CARD SUITE PROGRAMMING SOFTWARE .............................................................................................. 33
GENERAL DESCRIPTION..................................................................................................................................... 33
CONNECTION.................................................................................................................................................... 33
INSTALLATION.................................................................................................................................................. 33
READING THE UNIT ........................................................................................................................................... 33
CARD SUITE PROGRAMMING ............................................................................................................................ 34
Editing Screen............................................................................................................................................. 34
PROGRAMMING THE ACC2500.......................................................................................................................... 34
Zone Field Name ......................................................................................................................................... 34
Alarm Field Name ....................................................................................................................................... 34
DTMF Setup................................................................................................................................................ 34
Page PTT Pretime.....................................................................................................................................................34
Zone Address Length................................................................................................................................................35
Preamble Digits........................................................................................................................................................35
Zone Activation Duration..........................................................................................................................................35
DTMF Digit Time ....................................................................................................................................................35
Restrict Entry of Manual Zones.................................................................................................................................35
Restrict DTMF Over Dial .........................................................................................................................................35
Preprogrammed Zone/Alarm Aliases ........................................................................................................... 35
Preprogrammed Zone / No Alarm..............................................................................................................................35
Preprogrammed Zone with Alarm.............................................................................................................................36
Programmable Buttons................................................................................................................................ 36
Other Necessary Programming Settings....................................................................................................... 36
TROUBLESHOOTING..................................................................................................................................... 37
TROUBLESHOOTING THE ACC2500 DESK SET .................................................................................................... 37
FUSE REPLACEMENT.......................................................................................................................................... 38
CIRCUIT BOARDS........................................................................................................................................... 39
SCHEMATICS...................................................................................................................................................43
NOTES ............................................................................................................................................................... 52

1 09/08
Foreword
Scope of Manual
This manual offers descriptive data and service information for the Model ACC2500 Audio Control
Center. Service diagrams and printed circuit board details are a part of this service manual.
Nomenclature
The model number, located on the nameplate on the bottom, specifically identifies GAI-Tronics equipment.
If additional options are ordered, the option is identified on the circuit board.
Ordering Replacement Parts
When ordering replacement parts or requesting equipment information, please include the complete
identification number. This applies to all components, kits, and chassis. If the component part number is
not known, the order should include the number of the chassis or kit of which it is a part and sufficient
description of the desired component to identify it. Order parts from:
Customer Service
GAI-Tronics Corporation
400 E. Wyomissing Ave.
Mohnton, PA 19540
US: 800-492-1212
Outside US: 610-777-1374
Service and Repair
Inoperative or malfunctioning equipment should be returned to the factory for repair. Please call
1-800-492-1212 to obtain a Return Authorization number, published repair prices, and shipping
instructions. A Return Authorization number can also be obtained by visiting our website at
www.gai-tronics.com.
NOTE:A purchase order or credit card number is required prior to processing non-warranty repairs.
FCC Interference Warning
The FCC requires that manuals pertaining to Class A and Class B computing devices must contain
warnings about possible interference with local residential radio and TV reception. This warning reads as
follows:
NOTE:This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required
to correct the interference at his own expense.

Foreword ACC2500 Audio Control Center
09/08 2
Safe Handling of CMOS Integrated Circuit Devices
Many of the integrated circuit devices used in communications equipment are of the Complementary Metal
Oxide Semiconductor (CMOS) type. Because of their high open circuit impedance, CMOS integrated
circuits are vulnerable to damage from static charges. Care must be taken handling, shipping, and
servicing them and the assemblies in which they are used.
Even though protection devices are provided in CMOS integrated circuit inputs, the protection is effective
only against over-voltage in the hundreds of volts range such as is encountered in an operating system. In a
system, circuit elements distribute static charges and load the CMOS circuits, decreasing the chance of
damage. However, CMOS circuits can be damaged by improper handling of the modules, even in a
system.
To avoid damage to circuits, observe the following handling, shipping, and servicing precautions:
1. Prior to and while servicing a circuit module, particularly after moving within the service area,
momentarily touch both hands to a bare metal, earth-grounded surface. This will discharge any static
charge that may have accumulated on the person doing the servicing.
NOTE:Wearing a conductive wrist strap will minimize static build-up during servicing.
2. Whenever possible, avoid touching any electrically conductive parts of the circuit module with your
hands.
3. Power down the unit before installing or removing the circuit module.
4. When servicing a circuit module, avoid carpeted areas, dry environments, and certain types of clothing
(silk, nylon, etc.) because they contribute to static build-up. Similarly, disconnect the test probe prior
to removing the ground lead.
5. All electrically powered test equipment should be grounded. Apply the ground lead from the test
equipment to the circuit module before connecting the test probe.
6. If a circuit module is removed from the system, it is desirable to lay it on a conductive surface (such as
a sheet of aluminum foil) that is connected to ground through 100k of resistance.
7. When soldering, be sure the soldering iron is grounded and has a grounded tip.
8. Prior to connecting jumpers, replacing circuit components, or touching CMOS pins (if this becomes
necessary in the replacement of an integrated circuit device), be sure to discharge any static build-up as
described in procedure 1. Since voltage differences can exist across the human body, it is
recommended that only one hand be used if it is necessary to touch pins on the CMOS device and
associated board wiring.
9. When replacing a CMOS integrated circuit device, leave the device in its conductive rail container or
conductive foam until it is to be inserted into the printed circuit module.
10. All low impedance test equipment (such as pulse generators, etc.) should be connected to CMOS device
inputs after power is applied to the CMOS circuitry. Similarly, such low impedance equipment should
be disconnected before power is turned off.
11. Replacement modules shipped separately from the factory will be packaged in a conductive material.
Any modules being transported from one area to another should be wrapped in a similar material
(aluminum foil may be used). Never use non-conductive material for packaging these modules.

3 09/08
Description
Features and Benefits
Feature Benefit
LCD display Allows user-friendly interface; displays zone and alarm, status and
diagnostic information.
Programmable buttons Four buttons provide up to eight user-defined actions, i.e.,
preprogrammed zone and alarm selection, button remapping, output
control, etc.
DTMF Control for Model 133x2
Series Amplified Addressable
Speakers and GAI-Tronics SBA
and SBM Stanchion assemblies.
Generates the necessary control tones to address the GAI-Tronics
Amplified Addressable Speaker series and Stanchion Broadcast
products.
Hot-Standby Control Additional units can be connected for hot standby control in case of
primary failure. (Requires relay control option to be installed.)
External Event Notification LCD indicates external Audio Messenger Interface (AMI) event activity
such as contact closure or phone call.
Direct AMI Audio Monitoring User can hear all audio being generated by the AMI whether originated
from the ACC2500 or external event such as a timed event or telephone
broadcast.
Live Broadcast Supports live broadcast with zone selection
Front-mounted controls and
adjustments Includes mute/unmute and local speaker on/off.
Preannounce tone When programmed in the Audio Messenger Interface (AMI), a
preannounce tone will be generated prior to live broadcast from the unit
speaker and all addressed speakers/stanchions.
Built-in internal mic and speaker Allows for single push-button communication.
Programmable inputs and outputs Inputs and outputs can be configured for a variety of selections.
(Requires relay control option to be installed.)

Description ACC2500 Audio Control Center
09/08 4
Introduction to the ACC2500 Audio Control Center
The ACC2500 Audio Control Center works in conjunction with the GAI-Tronics Audio Messenger
Interface (AMI), Model 133x2 Addressable Amplified Speakers, and the GAI-Tronics Stanchion Broadcast
products to provide a complete wide-area broadcast and alert system. The unit allows addressing of
individual, zone or all addressable units in the system. Using the Audio Messenger Interface, live voice,
preprogrammed voice/tone messages as well as telephone dial-up live broadcasts can be made over the
system.
Each of the four programmable buttons can be configured for up to eight preset zone selection or preset
zone/alarm selection. In addition, the four optional inputs and three outputs can be programmed for
various uses. With optional relays, outputs can be configured for On-Air Light, General Purpose Control,
and On/Off. Inputs can be configured for Button Remap, Output Link, and Link to a preprogrammed zone
and alarm configuration.
The ACC2500 uses DTMF control for zone selection of the Addressable Amplified Speakers or Stanchion
Broadcast products. The unit allows direct entry of zones via the numeric keypad or selection of zones
using a preprogrammed alias (programmed using the CARD Suite software application.)
In addition, the unit allows direct entry of preprogrammed alarm messages/tones using the numeric keypad
or selection using the names of each message/alarm as programmed using the AMI ACT tool provided with
the Audio Messenger Interface. Upon power-up, the ACC2500 will verify the contents of the AMI
messages and retrieve them for use as necessary.
System Component References
The following represents a few common system component references.
ACC2500 Audio Control Center – The ACC2500 is a desktop unit complete with push-to-talk handset,
integral speaker and microphone, LCD display, DTMF keypad, and various control buttons. This unit
communicates directly with the AMI via RS-232.
Audio Messenger Interface (AMI) – The AMI provides programmed speech message and alarm tone
outputs via activation from the ACC2500. Additionally, the AMI provides dial-up telephone access to the
system.
Stanchion Broadcast Products – The 234SBA Stanchion Broadcast Assembly and 234SBM Stanchion
Broadcast Module receive the audio signal generated by the AMI and/or ACC2500. The units’ integral
speakers broadcast the received signal.
Addressable Amplified Speaker – The Addressable Amplified Speaker series provides discrete speaker
broadcasts of the AMI or ACC2500 audio signal.

ACC2500 Audio Control Center Description
5 09/08
Desk Set Button Panel
TRANSMIT Button and LED The red TRANSMIT button is
used to place the unit in the broadcast mode and to initiate
voice and alarm transmissions. The TRANSMIT LED,
located to the left of the button, illuminates steadily when
transmitting voice and flashes when the AMI is actively
generating a message/alarm or in a telephone voice call.
DEACT Button and LED The DEACT button is used to
immediately deactivate all active speakers or broadcast
assemblies and cease any activity currently on the AMI.
VOLUME Buttons The units contain two buttons labeled
VOLUME imprinted with up and down arrows. They are
used to increase and decrease the local speaker volume and
microphone levels. They are also used for special
applications.
CTL CTL is used in conjunction with other buttons to
provide secondary key functions.
TIME The TIME button briefly displays the current time.
This time is retrieved from the AMI and can be useful to
monitor for timed events automatically generated by the AMI.
Keypad Buttons The numeric keypad is used for the selection of a desired zone and alarms. See the
Operations section of this manual for further information.
STOP/CLR Button The STOP/CLR button serves two purposes. While an alarm is being generated
pressing the STOP/CLR button will stop the generation of the alarm and keep the addressed
speakers/broadcast assemblies active for their time-out duration. When selecting a zone or alarm, pressing
the STOP/CLR button will, if allowed via CARD Suite, permit manual entry of the zone or alarm.
ZONE UP and DOWN Buttons: The ZONEUP andDOWN buttons allow selection of a particular address
or zone using preprogrammed aliases. If no aliases have been programmed using the CARD Suite
application, these buttons are not used.
ALARM ON/OFF Button The ALARM ON/OFF button is used to turn alarm generation on or off. When
off, pressing the TRANSMIT button will activate the selected zone and allow live voice broadcast while
holding the TRANSMIT button. When on, the alarm will be displayed in the second line of the LCD
display. Pressing the TRANSMIT button will initiate the alarm. While the alarm is active, pressing the
TRANSMIT button will allow voice-over live broadcast while keeping the alarm playing at a reduced or
muted level.
ALARM UP and DOWN Buttons The ALARM UP/DOWNbuttons allow selection of the messages as
programmed in the AMI via the ACT tool program.
ACC2500 Front Panel

Description ACC2500 Audio Control Center
09/08 6
LCD Display: Each of the desk sets includes a backlit 2×16 character LCD display for operator
information.
Programmable Buttons: The PB1, PB2, PB3, and PB4 programmable buttons can each be configured to
perform two separate functions: one directly and the other in conjunction with the CTL button. Depending
on its configuration, the selected button illuminates when it is pressed.
Internal Microphone and Speaker
This microphone is intended for use in low noise environments. The handset must be on-hook in order to
use the microphone. The internal microphone and speaker are provided to allow one-button
communication.
Handset
Each ACC2500 is equipped with a handset with a coil cord used for receiving and transmitting calls. The
handset includes a push-to-talk (PTT) pressbar.
Rear View of ACC2500

ACC2500 Audio Control Center Description
7 09/08
Connectors
Power Connector
The ACC2500 is powered by a listed ac wall transformer supplying nominal 12 V dc. The operating range
is 10.5 to 15 V dc. The 5-pin power connector diagram and pinout are shown below:
Pin Function
1 -IN
2 Battery backup
+IN
3 +IN
4 -IN
5 +IN
AMI Connections
The rear of the ACC2500 contains two modular ports used to connect to the front control port of the AMI.
The 6-pin line connector is the transmit and receive audio connection to the AMI.
Pin Function
1 No connection
2 RX +IN
3 TX +OUT
4 TX –OUT
5 RX –IN
6 No connection

Description ACC2500 Audio Control Center
09/08 8
The 8-pin modular connector is the RS-232 data control port.
Pin Function
1 No connection
2 RS-232 TX OUT
3 No connection
4 GND
5 No connection
6 No connection
7 RS-232 RX IN
8 No connection
NOTE: It is important that those pins labeled "No connection" be left un-terminated. Connection of
these pins may damage the ACC2500 or AMI and may not be covered under warranty.
To facilitate the connection of these two ports to the AMI, the 69612-xxx (purchased separately) contains
three modular connectors and two cables. The two cables included combine the 8-pin and 6-pin ports as
necessary to allow connection to the front AMI control port using a standard category-5 networking cable.
This CAT-5 cable must be provided by the installer and must not exceed 45 feet in length.

ACC2500 Audio Control Center Description
9 09/08
Accessories, and Options and Kits
Description Part No.
CARD Suite Software on CD XAC1000A
Programming Cable XAC0004A
Relay Control Field Install Kit XRC0001A*
Mounting Kit for Option Boards XAC0100A
Power Supply, 120 V ac 60 Hz 3308-00750-00
Power Supply, 110/220 V ac 50/60 Hz 3308-00750-10
Desk Microphone** XDM002A
Gooseneck Microphone** XGM002A
Amplified Headset** XHS003B
Coiled Cord (required for XHS003B) XCC004B
Footswitch** XFS002A
Audio Accessory Box XAAB002A
*Requires XAC0100A (1 per unit)
**Requires XAAB002A Audio Accessory Box (1 per unit)

Description ACC2500 Audio Control Center
09/08 10
Performance Specifications
Color................................................................................................................................................ Black
Physical size................................................................................................ 7.6 W ×8.9 L ×4.7 H inches
Weight........................................................................................................................................... 2.4 lbs.
Temperature range...........................................................................................................-35°C to +70°C
Humidity.................................................................................................. 95% at 50°C (non-condensing)
Tx/Rx impedance.......................................................................................................... 600 ohms nominal
Power input................................................. 10.5 to 16 V dc; 500 mA maximum from supplied ac adapter
Safety............................................................................................Class III SELV powered equipment.
Powered by UL-listed (E104603)
and CSA-certified (LR67888) Class 2 ac adapter.
Emissions:......................................................................USA: FCC Part 15, Sub. B- Verification.
Canada: ICES – 003
Line interface.............................................................................................................FCC Part 68 Exempt
(Category II Tariff #260 service for private/leased line applications)
Canada: IC CS03-8
Range -14 to +12 dB into 560 ohms
Frequency response..................................................................+3 dB, 300 to 3000 Hz (except notch filter)
Hum and noise.................................................................................. Less than -45 dB below rated outputs
Audio output to speakers.................................................. 1 watt minimum with level in compression range
Audio distortion............................................................................................................Less than 3% THD

11 09/08
Operation
The ACC2500 provides system control of a GAI-Tronics wide-area broadcast system consisting of an
Audio Messenger Interface (AMI), amplified addressable speakers and/or stanchion broadcast products. It
allows selection of individual units or zones and selection of preprogrammed speech/tone alarms.
Audio that is output from the AMI is directly routed to the integral speaker or handset to allow direct
monitoring of the AMI audio by the ACC2500 operator.
Display
The ACC2500 has a backlit 2×16-character super-twist LCD display to provide valuable operator
information. This information allows the operator to determine the status of the unit. The following
describes the display at various states:
At power up:
•Initially, line 1 shows: CHECKING PARAMS, and line 2 shows: PLEASE WAIT.
•After 3 to 5 seconds, line 1 shows ACC2500, and line 2 shows the firmware version.
During normal operation,
Line 1 shows the currently selected zone, i.e. Zone 12
Line 2 shows:
•Speaker/handset audio level during a change of level
•Alarm selection when turned on or active
•AMI activity during internal and external events
•The current time when the TIME button is pressed
•Operator instructions during broadcast of live voice
During installation, the display shows various diagnostic information.

Operation ACC2500 Audio Control Center
09/08 12
Idle Mode
When power is applied, the ACC2500 is in the receive or idle mode, allowing any AMI audio to be heard
through the speaker or handset. It is always in this mode unless the unit is transmitting.
The ACC2500 contains an internal or local speaker and a handset that operate as follows:
•When the handset is in the cradle, or on-hook, audio is heard on the internal speaker. In some
operational modes, this can be changed, i.e., muting the speaker by pressing CTL + VOL Down.
•When the handset is off-hook, audio is routed to the handset receiver. By using the front panel buttons,
you may optionally select to hear audio through the local speaker in addition to the handset.
Zone Selection
The system can have many zones available to the operator each including one to many speakers or
broadcast assemblies. In order to select the proper zone for a broadcast of any type, the operator must first
select the desired zone. This zone is displayed on the first line of the LCD display.
Note that during installation and programming, the zone label can be changed to a desired display using the
CARD Suite application. By default, if nothing is programmed, the word “Zone” will be displayed on the
first line of the display. This could be changed to “Group,” “Area,” “Z” or any alphanumeric description
of up to eight characters.
After initial power-up, the display will be as shown below where the address of all units and zones is
programmed to be 3 digits in length.
→
Z o n e :
_
_
_
The “→” in the first location of the first line indicates that the zone selection is active. To manually select a
zone using the numeric key, enter the desired address or zone. To select zone 123, press “1,” “2,” followed
by “3.” As the digits are entered, the first digit will be display in the third blank and moved to the left as
subsequent digits are entered. If more than the allowed number of digits is entered, the zone entry will be
cleared and the last digit will become the first digit of the new address. After entry of the zone, the display
will appear as shown below:
→
Z o n e : 1 2 3

ACC2500 Audio Control Center Operation
13 09/08
If zone aliases have been programmed using the CARD Suite application, the operator may choose a zone
using a name instead of a direct number. For example, zone 123 can be programmed as “Zone 1,” zone
234 can be “Zone 2,” zone 345 can be “Zone 3,” zone 456 can be “Zone 4” and all zones can be “Zone
All.” To select a particular zone, the operator can use the ZONE Up/Down buttons to scroll to the desired
zone such as “Zone 3” as shown below:
→
Z o n e : Z o n e 3
If the alias has a pre-configured alarm associated with it, the alarm will be displayed on the second line of
the display. The operator may not override or turn off this pre-configured alarm and attempting to do so
will display an error message along with an error tone.
If the operator wishes to revert to manual entry, pressing the STOP/CLR button will switch back to manual
entry and will display the last manually entered zone. If the unit is programmed to restrict manual entry of
the zone addressed, pressing the STOP/CLR button will result is an error message and tone. While in
manual entry mode, pressing STOP/CLR a second time clears the zone entry.
Initiating Live Voice Broadcasts without an Alarm
After selecting the desired zone, the operator may initiate a live broadcast immediately by pressing and
holding any PTT source such as the main TRANSMIT button, handset PTT or PTT of a connected
accessory.
Upon pressing and holding PTT, if the selected zone is not active (more on this below) the unit will
generate the necessary DTMF digits to activate the desired zone. During the DTMF generation, the second
line of the display will be:
Z
o n e : Z o n e 3
* * * WA I T * * *
After generation of the DTMF sequence, the AMI, if programmed to do so, will generate a
preannouncement tone that is broadcast over the unit speaker and the selected zone. The operator will hear
the preannouncement tone and will be instructed to wait during the generation of the tone. Upon
completion of the preannouncement tone, the display will change to:
A C T I V E : Z o n e 3
* * * T A L K N OW * * *
“ACTIVE” will be flashing indicating that the selected zone has been activated and is within its time-out
duration. As long as the PTT source is held, the display will remain in this state. The operator may speak
whenever the display indicates ***TALK NOW***.
To cease voice broadcast the operator must release the PTT source. Upon doing so, the display will change
to:
A C T I V E : Z o n e 3

Operation ACC2500 Audio Control Center
09/08 14
Where “ACTIVE” will continue to flash for a programmed duration. This duration is determined by and
should be set to what the time-out time of the units in the particular zone are programmed to. For example,
if the units of a zone are set to deactivate after 5 seconds of inactivity, this time should be set for 5 seconds.
While “ACTIVE” is displayed and flashing, the operator may initiate another broadcast and the unit will
not regenerate the DTMF sequence needed to activate the units in the zone. When the word “ACTIVE” is
not displayed and flashing, the unit will generate the necessary DTMF sequence to activate the selected
zone each time a broadcast is initiated.
Handset Transmit
Use of the handset is recommended when the desk set is located in noisy surroundings. Press the handset
PTT bar or TRANSMIT button and speak into the handset microphone to transmit when the handset is off-
hook.
Transmit from Internal (Local)Microphone
Use the internal microphone only in low noise environments. The handset must be on-hook for the local
microphone to operate. Press the TRANSMIT button and speak in the direction of the integral microphone.
For the best transmit audio quality, maintain a distance of about 18 inches from the microphone.
Transmit from Desk Microphone or Footswitch
All models can be keyed to transmit with an external desk microphone when used with the optional Model
XAAB002A Audio Accessory Box. Use of the GAI-Tronics Model XHS002A Desk Mic, or compatible
microphone, is recommended. Refer to the XAAB002A documentation for connection and installation of
this option.

ACC2500 Audio Control Center Operation
15 09/08
Alarm Selection
In addition to live voice broadcasts, the ACC2500 allows selection of programmed alarm/speech messages
to be broadcast to particular zone. If the displayed alias has a preconfigured alarm associated with it, the
operator may not change it or turn it off. To select an alarm, press the ALARM ON/OFF, ALARM UP or
DOWN buttons until the second line of the display is as shown below:
Z
o n e : Z o n e 3
→
A l a
r
m:
_
_
_
The “→” in the first location of the second line indicates that the alarm selection is active. To manually
select an alarm using the numeric key, enter the desired alarm number as stored in the AMI. To select
alarm 12, press “1” followed by “2.” As the digits are entered, the first digit will be display in the third
blank and moved to the left as subsequent digits are entered. If more than the allowed number of digits is
entered, the alarm entry will be cleared and the last digit will become the first digit of the new alarm. After
entry of the alarm, the display will be as shown below:
Z
o n e : Z o n e 3
→
A l a
r
m:
_
1 2
The alarm aliases differ from the zone aliases in that they are retrieved from the AMI as necessary and
programming of these aliases is done with the ACT Tool. To select a particular alarm using the AMI
aliases, press the ALARM Up/Down buttons to scroll to the desired alarm name.
Z
o n e : Z o n e 3
→
A l a
r
m: Lo c k D o w n
Note that, like zone selection, the name of the alarm field can be changed via CARD Suite to any desired
alphanumeric name of up to eight characters. By default, the field will be named “Alm:” A consideration
here is that the AMI message names are up to 32 characters in length and using the field name of “Alarm”
uses valuable display space allowing only the first 9 characters of the AMI name to be displayed. If more
characters are desired, the field name can be changed to “A,” which will allow up to 14 characters of the
AMI name to be displayed.
If the operator wishes to revert to manual entry, pressing the STOP/CLR button will clear the alarm entry.

Operation ACC2500 Audio Control Center
09/08 16
Initiating Alarm Broadcasts without Voice
After the desired zone and alarm have been selected, the operator may begin broadcasting the alarm by
pressing and releasing any PTT source such as the main TRANSMIT button, handset PTT or PTT of a
connected accessory.
Upon pressing PTT, if the selected zone is not active, the unit will generate the necessary DTMF digits to
activate the desired zone. During the DTMF generation, the second line of the display will be:
Z
o n e : Z o n e 3
* * * WA I T * * *
After generation of the DTMF sequence, the AMI will begin generation of the selected alarm that will be
broadcast over the unit’s speaker and the selected zone. The display will be as shown below:
A C T I V E : Z o n e 3
A
l a
r
m: Lo c k D o w n
“ACTIVE,” “Alarm” and the alarm name will be flashing indicating that the selected zone has been
activated, is within its time-out duration, and the selected alarm is being broadcast. In addition, the
TRANSMIT LED will flash. As long as the alarm is being broadcast the display will remain in this state.
Depending on the programming of the particular alarm selected in the AMI, the alarm may broadcast one
or more times or repeat indefinitely.
If the alarm is programmed to broadcast for a predetermined number of times, upon completion of the last
broadcast, the alarm will cease playback and the flashing of “Alarm,”and the alarm name and the
TRANSMIT LED will cease. After the selected units time out due to inactivity, the display will return to
the alarm edit mode as shown below:
Z
o n e : Z o n e 3
→
A l a
r
m: Lo c k D o w n