RTS 848A User manual

TM5545 / O/N9380-5545-80 Rev E
Matrix Intercom Station
O/N9000-5545-00
Data Connector
81N 9000-5556-08
RTS SYSTEMS
A TELEX COMMUNICATIONSPRODUCT

PROPRIETARYNOTICE
The information and design disclosed herein were
originated by and are the property of RTS Systems. RTS
Systemsreservesallpatent,proprietarydesign,manufactur-
ing, reproduction,use
and salesrights thereto, and to any
article disclosed therein, except to the extent rights
are
expresslygranted to others.
COPYRIGHTNOTICE
Copyright 1991 by RTS Systems, Burbank, California,
U.S .A. All rightsreserved.Reproductioninwholeorinpart
without writtenpermissionfromRTSSystemsisprohibited.
PATENT NOTICE
Thisproductcontainsandusesadesignembodied in United
States Patent No. 4,358,644: "BILATERAL CURRENT
SOURCE FOR A MULTI-TERMINAL INTERCOM".
This design employs a bilateral current sourceoperatedas
a two-wireto four-wireconverter.
TechnicalManual,TM5545
Model 848AMatrix Intercom System
Model DC848Data Connector
Thismanualispublished by theEngineeringDepartmentof
RTS Systems, which isresponsible for itscontents.
Address communicationsregarding this manual to:
SalesEngineer
RTS Systems
TheCenteratBurbankAirport
2550 HollywoodWay, Suite207
Burbank,CA 91505USA
QUICK TABLE OF CONTENTS
tice ........... ii
............. ii
.........
UnpackingInformation ii
..............
Warranty iii
Return ShippingInstructions
....... iii
Descriptionand Specifications ...... 1-1
Installation
.............. 2-1
OperatingInstructions
......... 3-1
.........
Theory of Operation .4-1
Maintenance,TestProcedures
..........
& Troubleshooting 5-1
UNPACKING AND INSPECTION
Immediately upon receipt of the equipment, inspect the
shipping containerand the contents carefully for any dis-
crepancies or damage. Should there be any, notify the
freightcompany
and the dealeratonce.
The Model 848A Matrix Intercom Station shipping con-
tainer shouldcontain the followingcomponents:
OrderingNumber 9000-5545-00
RTS Systems
atlr -
1 9010-5545-00 Model 848A
1 9300-5545-00 TechnicalManual
1 9020-4979-00 PowerSupplyAssembly
17 2006-0014-00 TerminalConnectors,
pin crimp
1 2006-0075-00 15-pinconnector with
lockingramp
The Model DC848 Data Connector shipping container
shouldcontainthe followingcomponents:
. '4
?\%
OrderingNumber 9000-5556-00
RTS Systems
Qty Part Number Desctipti~
1 9000-5556-00 Model DC848
1 9300-5545-00 Technical~anuh
1 9020-4979-00 Power SupplyAssembly
NOTICE
"Warning: Thisequipmentgenerates,uses, and canradiate
radio frequency energy, and if not installed and used in
accordance with the instruction manual, may cause inter-
ference to radio communications. It has been tested and
found to comply with the limits for a Class A computing
devicepursuanttoSubpart
J of Part 15 ofFCCRules,which
are designed toprovidereasonableprotection against such
interferencewhen operated in a commercial environment.
Operationof this equipment
in a residentialareaislikely to
cause interference in which case the user, at his own ex-
pense, will be required to take whatever measuresmay be
required to correctthe interference."
-Pageii-

RTS SYSTEMS' LIMITEDWARRANTY
Theproductsof RTS Systemsarewarranted to be free from
defectsin materials and workmanship for a period of three
years from the dateof sale.
RTS Systemssoleobligationduring thewarranty period is
to provide, without charge, parts and labor necessary
to
remedy covered defects appearing in products returned
prepaid toRTS Systems. Thiswarranty doesnot coverany
defect, malfunctionorfailurecausedbeyond thecontrolof
RTS Systems,including unreasonable or negligent opera-
tion, abuse, accident, failure to follow instructions in the
ServiceManualortheUser Manual, defectiveorimproper
associated equipment, attempts at modificationand repair
not authorized by RTS Systems, and shipping damage.
Productswith their serialnumbers removed or effaced
are
not covered by this warranty.
To obtain warranty service, follow the procedures entitled
"PROCEDURE FOR RETURNS" and "SHIPPING TO
MANUFACTURERFOR REPAIR
OR ADJUSTMENT".
This warranty is the sole and exclusive express warranty
givenwithrespecttoRTSSystemsproducts.Itistherespon-
sibility of the user to determine before purchase that this
product issuitablefor the user's intended purpose.
ANY AND ALLIMPLIEDWARRANTIES,INCLUD-
ING THE IMPLIED WARRANTY OF MERCHAN-
TABILITY ARELIMITED TO THEDURATION OF
THIS EXPRESS LIMITEDWARRANTY.
NEITHER RTS SYSTEMSNOR THEDEALERWHO
SELLSRTSSYSTEMS'PRODUCTSISLIABLEFOR
INCIDENTAL OR CONSEQUENTIAL DAMAGES
OF ANY KIND.
RETURN SHIPPINGINSTRUCTIONS
ProcedureForReturns
If a repair is necessary, contact the dealer where this unit
was purchased.
If repair through the dealer is not possible, contact the
Customer Service Department, located at the factory by
telephone, as directed below, to obtain a RETURN
AUTMORIZATIONNUMBER.
DO NOT RETURN ANY EOUIPMENT DIRECTLY
TOTHEFACTORYWITHOUT FIRST OBTAINING
A RETURNAUTHORIZATIONNUMBER.
Beprepared toprovide the company name, address,phone
number, a person to contactregarding the repair, the type
and quantityof equipment,adescriptionof theproblem and
the serialnumber(s).
Questionsregardingreturnsforrepairshouldbedirectedto:
CustomerServiceDepartment
RTS Systems
TheCenteratBurbank Aiiort
2550 Hollywood Way, Suite207
Burbank,CA
9 1505U.S.A.
Telephone: [phone]
Telex: 194855
Telefax: [phone]
SHIPPING TOMANUFACTURER FOR REPAIR
OR ADJUSTMENT
Allshipmentsof RTS Systemsequipmentshouldbe a
viaUnitedParcelServiceor thebest availableshipper.The
equipmentshould
be shippedin theoriginalpackingcarton;
if that
is notavailable,useany suitablecontainerthatisrigid
and of adequatesize. If a substitutecontainer is used, the
equipmentshould
be wrappedinpaperandsurroundedwith
atleast fourinchesof excelsior or similarshock-absorbing
material. All shipmentsshould be directed to the attention
of the Customer Service Departmentand must include the
Return AuthorizationNumber.
Upon completion of any repair the equipment will be
returnedcollectviaUnitedParcelServiceorspecifiedship-
per.

TECHNICAL MANUAL
Model 848A Matrix Intercom Station / Model DC848 Data Concentrator
TD OTHER TW INTERCOM
Note: This blockdiagramshows afullsizesystemwithcableconnectionsfor the
STATIONS (IFUSED); matrixintercomsignals(50-conductorcable),the Pchannelconference-linesignals
PSWPS31
POWER SUPPLY. (3-conductorcable), andthe serialdatabussignals(single-pair,twin shieldcable).
Alternatecablingschemesandsystemsarrangementscan
be configuredto besl
suit individualrequirements.
Figure 1-1
Model 848A System Block Diagram
Page iv

TECHNICALMANUAL
Model 848A MatrixIntercom Station / ModelDC848 Data Concentrator
Appendix A
TableA-d.
Locationversus Address Assignment and Cabling
Log
Page A-1

ADDENDUMTOMODEL848A/DC848 TECHNICAL MANUAL
ADDENDUM 1
Model 8slSA/DC848 software updateto Version 6.5 has added the followingfeatures:
TW DynamicMatrix Displayscreen: In the System StatusMenu, after viewing theDynamic MatrixDisplay,
by hitting [return]a user may
call up an additional display showing thestatus of the bottom-row buttons for
each of the
24 panels. Hitting [return]again will then return the user to the Main Menu. To view back-and-
forth between the two Matrix Displays, the [esc]and [return]keys are alternately used. Status of the bottom-
row buttons
is indicated using the followingabbreviations:
T1
= Talk 1
L1 = Listen 1
T2 = Talk 2
L2
= Listen 2
/ SP = Speaker
MS
= Mic Switch
AT
= ALL TALK
PM = Panel Mic
Store Configuration: In the System Configuration Menu, when you use the StoreConfiguration option,the
system may storeeither the pre-programmedconfiguration or both the preprogrammed and the actual panel
configuration
as it appears at the user station. When you retrievethe conftguration,you have the option of
retrieving
all the.crosspointsor only the pre-programmed (from the DC848) crosspoints. When you retrieve a
.storedconfiguration,none of the crosspointscurrentlyselected at each panel
will be interrupted;it will add the
retrieved ~o~gurationto them. Toretrieve only the exact pre-programmedcrosspoints,you must use the Reset
System optionprior to retrievingthe configuration.
Mic Kill: In the System Configuration Menu, listed as Number
4 is now a "Mic Kill" option,which assures
that all microphones
in the system areoff.
PageAl-l

Name
TECHNICALMANUAL
Model 848A Matrix Intercom Station / Model D6848 Data Concentrator
Table A-2
Parts List Reference:
Vendor Directory
3M
AHAM
ALLEN-BRADLEY
AMATOM
AMER RESEARCH
AMPHENOL-BENDIX
AP PRODUCTS
APTRON
I CS
BELDEN
BERG, U.M. INC.
BOURNS
BURNDY CORP
BUSSMANN
C&K
CALRAD IMPORTERS
CAMB
I ON
CANNON USA
CONDOR
DALLAS SEMI
DENNISON
EAO SUITCH CORP
FAIR-RITE
FEK
FOX ELECTRONICS
HIROSE USA
HITACHI AMERICA
JKL
LICON
MOLEX
MOTOROLA
MWSER
NATIONAL
NEUTR
I K
NPN
OAKTRON
Cage Code Address
BLDG. 502, POB 2963 AUSTIN TX 78769-2963
27901 FRONT STREET, RANCHO CALIF, CA 92390
1414 ALLEN-BRADLEY DR, EL PAS0 TX
79936
446 BLAKE ST, NEW HAVEN CT 06515
1500 EXECUTIVE DRIVE, ELGIN,
IL 60120
2122 YORK RD, OAKBROOK IL60521
9325 PROGRESS PKWY, MENTOR OH 44060
9450 PINENEEDLE DR, MENTOR, OH 44060
PDB
1980, RICHMOND IN 47374
499 OCEAN AVENUE, EAST ROCKAUAY NY 11518
1200 COLUMBIA AV, RIVERSIDE CA 92507
RICHARDS AVENUE, NORWLK CT 06856
POB 14460, ST. LWlS
W 63178
15 RIVERDALE AV, NEWTON MA 02158-1082
819 1. HIGHLAND, HOLLYWOOD CA 90038
10550 TALBERT AV, FOUNTAIN VALLEY CA 92708
580 UEDDELL
DR #3, SUNNYVALE CA 94089
300 HOWARD ST, FRAMINGHAM MA 01701
MILFORD CT
PO BOX
J, UALLKILL NY 12589
6225 PRESIDENTIAL CT, FT MEYER FL 33907
9254 DEERING AV, CHATSUORTH CA
91311
2210 OfVOOLE AV SAN JOSE CA 95131
13343 PAXTON ST, PACOIMA CA
91331
6615 IRVING PK RD, CHICAGO IL60624
2222 WELLINGTON CT, LISLE IL60532
3102 N 56TH ST PHOENIX AZ 85018
11433 WOODSIDE AV, SANTEE CA 92071
11731 MARKON DR, GARDEN GROVE CA 92641
1913 ATLANTIC AVENUE, MANASQUAN n j
SEE MOTOROLA
PO BOX 53143, MILUAUKEE UI 53288
Phone Other
ELECTRONIC PRODUCTS DIVISI""
DBA AT1 HEATSINKS
DIV. ROCKUELL
DIV. MITE CO
DIV. OF 3M
3M PRODUCT DIVISION
ELECTRONIC DIVISION
DIV MIDLAND ROSS
APPLYING FOR CAGE CODE
SEMICONDUCTOR
& IC DIV
DIV. ILL TOOL WORKS
SEMICONDUCTOR DIV
DIV. HH SMITH
Page A-2

TECHNICAL MANUAL
Model $48A Matrix Intercom Station / Model DC848 Data Concentrator
Parts List Reference:
Vendor Directory,
cont'd
PANDUIT
PEW
PENN ENG
& MANU
PIHER
RCA
ROBINSON NUGENT INC
SAMTEC
SCHURTER
SELCO
SIFAM
SIGNETICS
SILICONIX
SMART
SMITH, HH (DIALIGHT)
SWTHCO
SPECTRA
STANLEY
SWITCHCRAFT
THERMALLOY
TRW CONN
17301 RIDGELAND AV, TINLEY PK IL 60477-0981
PO BOX 1000, DANBORO, PENN
18916
DANBORO, PA 19816- 1000
903 FEEHANWILLE DR, MT PROPSPECT IL 60056
800 E 8TH ST, NEU ALBANY IN 47150
810 PROGRESS BLW, NEW ALBANY NY 47150
1016 CLEGG CT, PETALUMA CA 94952
7580 STAGE RD, BUENA PK CA 90621
SEE SELCO
811 E ARGO AV, SUNNYVALE CA 94086
2201 LAURELUOOD, SANTA CLARA CA 95054
SEE DALLAS SEMICONDUCTOR
1913 ATLANTIC AV, MANASQUAN NJ 08736
212 N BRINTON LAKE RD, CONCQRDVILLE PA
19331
SEE AMPHENOL
10 OCEAN AV, COPIAGNE NY 11726
5555 N ELSTRON AV, CHICAGO IL60630-1314
2021 W VALLEY VIEW LN, DALLAS, TX 75381
1501 MORSE AV, ELK GROVE VILLAGE IL
60007
312-532-1800
215-766-0371
215-766-0371
312-543-6400 SOLID STATE DIV
812-945-0211
81 2-944-6733
707-778-631 1
714-521-8673 ALSO: SEL SALES, INC
516-842-8866 DIV OF RAYTHEON
214-243-4321
31 2-987-6000
Page A-3

OEM Part No
TECHNICALMANUAL
Model 848A Matrix Intercom Station / Model DC848 Data Concentrator
Table A-3
Parts List Reference:
Cage Code Cross-Reference
OEM CAGE CODE Vendor Part No
EC100F-5
8216-A-0632
9293
9475A0632
2334
95328-8-0440
95328-8-0440
95348-8-0632
1416-6
1416-6
99-910
A4-10-501-20
3341-1L
THlS4
KF2-440
EC100F-3
852200F006
81AlA-824-S15
PTClOLVPlOK
PTlOyv20K
Log
MR502
J305/E305
2N5210
74HC04
63A03RP
74HC573
74H6139
LM317
LM3800N-8
LM383T
CD4053 BE
NE5532-N
ESBR3441
8099SBP
K405
- S
99-456
DIL8P-108
DIL14P-108
DIL14P-108
VENDOR
CAGE CODE Item of Sum~yPart No CAGE CODE
06383
06540
83330
06540
83330
06540
06540
06540
83330
83330
61706
94222
04963
06383
46384
06383
04713
08116
54869
54869
04713
17856
04713
27014
HITACHI
27014
27014
27014
27014
27014
02735
18324
61544
55335
65832
61706
09922
09922
09922
Page A-4

TECHNICAL MANUAL
Model 848A Matrix Intercom Station / Model DMData Concentrator
OEM Part No OEM CAGE CODE
. .-
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
68572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
60572
Vendor Part No
~1~16~-108-
-
DIL40P-108
DS1213
DS1213
DIL20P-'08
1CT-286-S-X
65610-410
30-552A
30-560A
30-550A
09-65-1031
09-50-3041
08-50-0108
08-50-0106
09-50-3031
09-50-3021
09-75-1158
09-74-1061
09-74-1031
08-50-0106
65610-410
65610-420
65610-426
08-50-0106
65610-414
65610-414
66900-014
66900-014
3473-6016
65611-410
3428- 1202
929647-01-06
HLSS100-3
HLSS100-5
HLSS100-10
HLSS100-10
57- 10500-27
66900-020
3399-6026
861178EFRA9S
VENDOR CAGE CODE
I tern of Supply Part No CAGE CODE
-. - . - -- - -- -- - - -
09922
09922
DALLAS SEMI
SMART/BALLAS SEMI
09922
06776
29440
53514
53514
53514
27264
.
27264
27264
27264
27264
27264
27264
27264
27264
27264
29440
29440
29440
27264
29440
29440
29440
29440
04963
29440
04963
80266
06383
06383
06383
06383
74868
29440
04963
74860
Page 8-5

TECHNICAL MANUAL
Model 848A MatrixIntercom Station / Model DC848 Data Concentrator
MN114B
MN114B
30-454
30-453
AXR-5-31
HA16PR-3s
SEP- 10K8-02
CE100F24-3
CE100F24-5
30-453
AXR-5-31
WP664012CG
LM9003
LM9003
42TM018
542-FB43-287
542-FB73-287
8431352801020
8431352801026
8431352801010
8022
922345-02
S210-250
S210-250
C212
99-920.8
MDL-2
031.1666
FAUO3l.3573
049
249
7-362
- BA
82389
82389
53514
53514
71468
0ag18
55322
06383
06383
53514
71468
59940
08116
08116
50811
5081
1
50811
74868
74868
74868
16428
80266
59270
59270
59270
61706
71400
FEK
61935
61429
13103
1e188
Page A-6

TECHNICALMANUAL
Model 848A Matrix IntercomStation / Model DC848 Data Concentrator
REVISIONS FOR THE SECOND PRINTING:
Date Edition
- Pave No. Descriotion
of Revision
6/89 3rd Cover Added: SecondPrinting, June 1989.
6/89 3rd Cover Changed: 9010-5545-00 to 9000-5545-00.
6/89 3rd ii Added: Second Printing,June 1989.
6/89 3rd ii Changed: Edited
by to Sheryl D. Thompson.
6/89 3rd 6-14 Added: Page 6-14 (missingin previous edition).
6/89 3rd 7-11
- 7-17 Deleted: "A" from the 848.
6/89 3rd 7-25 Repalced: DrawingSD300-09with
SD3000 sheet #11.
RTSSystems, Inc. Burbank, CA 91506 / FSCM: 60572 'I'M5545 / Third Edition,August 1988
PageA-7

TECHNICAL MANUAL
Model 848A MatrixIntercom Station / Model DC848 DataConcentrator
SECTION
1: DESCRIPTION & SPECIFICATIONS channel. The conference line channels and point-to-
point channelsmay
be used at thesametime.
1.1 DESCRIPTION Model
848A StationMicro~rocessor
1.1.1 SystemandModel WADescription
(SeeFigure
1-1, Model 848A System Block Diagram)
Point-to-PointMatrixIntercom
A Model 848A system consists of Model 848A sta-
tions, connecting cables,
and, optionally, a Model
DC848 Data Concentrator and data terminal (a per-
sonalcomputer
can be used as a terminal).
Each
848A is a station in a point-to-point intercom
system which
can have as few as 2 stationsor as many
as 24 stations. Each station can talk to a singlestation
or combinationof other stations.
Any configurationof multiple stations
in this system is
called a matrix. In the matrix, up to
12 separate
conversations may be in progress at any time. Each
conversation requires two talk paths to two listen
buses. Each talk path is the listen bus for one of the
twentyfour stations.
In a typical operating example, a user (caller) chooses
the station he wishes to talk to by pressing the push-
button correspondingto the called station. The called
station
can then hear the calling station. No other
station
can hear this message unless it shares the
samelisten bus
as the called station or more than one
stationhasbeen called by the caller.
The called station answers tbe calling station by
pressing the pushbutton corresponding to the calling
station. If the
848A system includes a DC848 Data
Concentrator,a call may also be answeredby pressing
the
call answer pushbutton, which is marked with the
station's own number with a colored insert. When the
communication is completed, each station releases
and the connection isbroken.
A station
can talk to all other stations at once, by
pressingtheALL TALK button.
ConferenceIntercom
Each Model 848A station has two
TW Intercom con-
ference-linechannels,which either connect to an RTS
Systems
TW Intercom System, or interconnect 848A
stationsfor two channels of isolated conference inter-
com. These conference lines, Channels
1 & 2, have
front panel TALK and LISTEN switches for each
Each Model
848A is equippedwith an internalmicro-
processor which provides electronic switch-action
(momentary /latching), and a
link to the Model
DC848 Data Concentrator. If the power fails, the
station remembers its settings. The settings are re-
storedwhen thepower returns.
1.12 System and Model DC848 Description
Connecting a Model DC848 to the
848A system adds
these functionsto the system:
1. CallTally
2. ReceivedCallStacking
3. Remote-Control / ProgrammingCapabilities
1. The Call Tally function means that the pushbutton
corresponding to the calling station
will flash on the
called station's panel, telling the operator visually
which station is calling.
2. TheReceived Call Stackingfunction means that if a
station
is called by several stations, the called station
will make a queue of the calling stations. This queue
can be answered in succession by pressing the Call
Answer pushbutton.
3. The Remote Control / Programming Capabilities
allow the Model
848A to be controlled and
programmed remotely by connecting either a
computer or a "dumb" terminal to the Model DC848
data bus. The software for the 848A and
DC848 lets
eachstationbe programmed individuallyin real-time.
Featuresprogrammable with this setupinclude:
a. Forced Crosspoint. Sets up a one way voice
communicationpath between two stations.
b. Inhibit Crosspoint. Inhibits voice path and tally,
oneway, between two stations.
(Continued)
Page
1-1

TECHNICAL MANUAL
Model 84&4 Matrix Intercom Station / ModelDC848Data Con=nt,rator
c.
Panel Switch Action (Latch Disable). Sets the
switch action for an individual panel switch,
either momentary only or both momentary
and latching.
d. Hands-Free Answer (Auto Reci~rocal).When a
station
is called, 'its microphone turns on
automaticallyto allow hands-freeanswering
e.
"Instant Mic Onw. When set, the microphone will
turn on automatically whenever a call is
originated.
f.
'!InstantSveaker OQ". When set, the speakerwill
turn on automatically whenever the station
is called.
g.
Auto Talh, Flash Erne. Adjusts the time the
pushbutton will flash when called. Can
be
set from a 10-second minimum to a 60-
secondmaximum in 10 second increments
h. Panel Grou~Assignments. Assigns panels into
preset groups.
a. Dvnamic Comlink Dis~lashows stations
that are connected and responding to the
DC848 data concentrator.
b. wy shows all
possible talk paths in current system and
their status.
j. Svstem Confirmration. Allows preset
configuration to
be stored into memory, and
retrieved. There
is also a reset choice.
k.
Password Security. Sets a password, preventing
unauthorized use, either by terminal or
modem.
1.13 Model 848A OperationalControls
Theoperationalcontrolsare:
in a system with a DC848 connected. This button
is
also the stationaddress.
All pushbuttons have two levels of brightness. An
activated button has a higher brightness.
The third row of eight pushbutton switches are
as
follows:
COW
1 TALK INTERCOMCH.l
CONF
1 LISTEN INTERCOMCH.l
COW2TALK INTERCOMCH.2
CONF2LISTEN INTERCOMCH.2
ALL TALK
PANEL MIC (selects panel microphone when
ON or headset microphone when
SPKR ON (speOTer on)
MICON (enablesmic circuit in either panel mic
or headset, whichever
is selected by
PANEL MIC switch)
1.1.4 Model 848A Connections,Inputs and Outputs
Front Panel
DynamicMicrophone Headset Connector.
Carbon MicrophoneHeadset Connector.
Rear Panel
POWER
INPUT connector, 5702 (12 volt ac/dc).
AUXILIARY CONNECTIONconnector, 5104.
TW INTERCOMSYSTEMLINE INPUT connector,
5602(Conference Line, Two Channels).
EXTERNALLOUDSPEAKER connector,
5204.
SERIALIN connector, 51001.
SERIALLOOP-THRU connector, 51002.
LINE CONNECTIONconnector, 5401
Auxiliarv Connections
The auxiliary connections on the back panel of the
Model
848A provide the user with a program input,
an unswitched microphone preamplifier output and
additionalconnectionstothe front panel.
Threerows of pushbutton switches, and The program input accepts a -10 dBu signal which
is
distributedtoboth the loudspeaker and the headsets.
Themaster VOLUME control. Thelevel
can be adjusted on the adjustmentcard.
The fvst two rows of
24 pushbutton switches select The unswitched microphone output provides a
-
the called point to point matrix stations,except for the 10dBu line level signal from the Model
848A
one pushbutton with a colored insert. This pushbut- microphone preamplifier.
ton
is the "CallAnswer" pushbutton, and is active only
Page 1-2

TECHNICAL MANUAL
Model 848A MatrixIntercom Station / ModelDC848 Data Concentrator
Additional connections for an external panel
microphone and headset. A remote microphone
switch
is also available. Any switch, such as a
foortswitch,
can be used to short the two terminals
together to
turn on the microphonecircuit.
1.1.5 Model 848A Preset (Trimpot) Adjustments
The preset adjustment pots are located behind the
small rectangular panel to the left of the loudspeaker.
To access the adjustments, press the rectangular
panel lightly, then release, this will unlock the panel.
Pull thepanel out
as far as it will go.
Behind this small panel, on a circuit board, in two
rows, arethe followingten adjustmentpots:
TopRow
LISTE!.N/TW
1
ConferenceLine 1 level
LISTEN/TW 2 ConferenceLine
2 level
LISTENIALL(Talk) Page level
LISTENIMATRIX
24 point-to-pointstations
LISTE!.N/PGM Auxiliary program
Bottom row
BAL/1 ConferenceLine
1 balance
BAL/2 ConferenceLine 2balance
SIDETONE Headset SidetoneLevel
Adjustment
DIM SpeakerAttenuation during
Mic on
MIC Microphonegain
adjustment
1.1.6 Power
Model 848.4 Power
Each Model
848A requires 12volts ac at 1.4 amperes
to operate.
This power is supplied by an RTS
Systems Remote Power Supply--included with each
unit. The power supply comes in two types, one
whose mains input
is 117 volts/50-60 hertz ac, or a
second type whose mains input
is 2U) volts/50-60
hertzac.
ModelDC848 Power
1.1.7 Package
Model 848A Package
TheModel
848A is enclosed within a metal case de-
signed to fit a standard
19" rack and occupiestwo rack
units of space. TheModel
848A measures3.47" high
x 19"wide x 7" deepand weighs 6 pounds.
ModelDC848Package
TheModel DC848
is enclosed within a metal casede-
signed to fit in a standard19"rack and occupiesone
rack unit of space. It
is 1.75" high x 19"wide x 10"
deep, and weighs 2.2 pounds.
The Model DC848 requires 12volts ac at
0.5 amp-
eres, and comes with its own RTS Systems Power
SupplyUnit normally identicalto the
848A supply.
Page
1-3

TECHNICAL MANUAL
Model 848A Matrix IntercomStation/ModelDC848 Data Concentrator
1.2 SPECIFICATIONS
12.1 MODEL848AMATRIX INTERCOM SYSTEM SPECIFICATIONS
Bus Complement
24 balanced distributed talk/listenbuses
1 balanced distributed all talk bus .
2 TW Intercom 2-wire buses
AudioLevel/Bus Impedance
DistributedSummineBuses
-10
dBu, test level 500 ohms
-20 dBu, nominallevel 500 ohms
TW Intercom Lines
0
dBu, test level
200 ohms
-10
dBu, nominalspeech 200 ohms
StationBridgingImpedance
DistributedSummingBuses
12 kilohms, nominal
6 kilohms, LISTENselected
TW Intercom Lines 10kilohms, nominal
DistributedSummingBus Termination
(One terminationper system bus is usuallyrequired.
Terminationplugs may
be orderedfrom RTS Systems.)
Up to8 stations
Up to 16stations
Over 16stations
RecommendedMaximum SystemSize
Number of stations
(buslevel lowered by
3 dB)
4
Stationsper bus
(same listen channel)
OperatingDistance
with
balanced-paircable,
#22 gaugewire
680 ohms (RTSSystems Part Number 9020-5189-01)
1500 ohms (RTSSystemsPart Number 9020-5189-02)
No termination
5,000 feet
Page
14

TECHNICAL MANUAL
Model 848A MatrixIntercomStation/Model BC848 DataConcentrator
1.2.2 MODEL 848A INTERCOM STATIONSPECIFICATIONS
MicrophonePreamplifier
Input
Input Impedance
SourceImpedance
Maximum InputLevel
Voltage
Gain
Limiter Range
FrequencyResponse
Output (rear panel access)
(load impedance10Kohm)
Headset Microphone
sensitivityrequired
Headset Microphone
SourceImpedanceRange
Switchable, panel orheadset Mic
500 ohms/dynamic Mic
800 ohms/lO milliamperes max carbon Mic
200 ohms, nominal
150 millivolts
50 dB, nominal, adjustable
30dB
100hertz to 10kilohertz,
f 3 dB
-10 dBu, test level
-21 dBu, nominal speechlevel
-50 dBu minimum
100to 1000ohms
HeadphoneAmplifier
Output Power 1 watt into 8 ohms
300 milliwattsinto 32 ohms
FrequencyResponse
150 hertz to 8 kilohertz, 23dB
HeadphoneImpedanceRange
25 to 600 ohms
LoudspeakerAmplifier
Output Power
into
8 ohm speaker
Dim Range
(dim when Mic on)
FrequencyResponse
UserAdjustable Level Trimpots
Listen Bus (1 of 24 system buses)
All talk listen
TW IntercomChannel 1 listen
TW IntercomChannel 2 listen
Sidetone(only in headphone)
Programinput
2 watts into 8 ohms
3 dB to 20 dB, adjustable
150 hertz to 8 kilohertz, 3 dB
(Continued)
Page 1-5

TECHNICALMANUAL
Model 84814 MatrixIntercomStation/ModelDC848Data Concentrator
1.2.2 MODEL848A INTERCOM STATIONSPECIFICATIONS (Continued)
AuxiliaryConnections
External Headset
ExternalPanel Microphone
ExternalElectret Panel Mic
ExternalMicrophone On--Off
Unswitched Mic Output @-lodBu
Program Input
@-I0 dBu, 10K ohms
Power And Mechanical
848A Power Requirements
12 volts ac / 1.4 amperes / 45-440 hertz
Power SupplyModule
Power Requirementsfrom Mains:
25 volt-amperes, typical
30 volt-amperes, maximum
250 volt-amperessurge, 25 milliseconds
Dimensions
Weight
Finish
Front Panel
Rear Housing
ConnectorRequirements
MatrixIntercom;
Audio Line Connector
Line Cable
Type
6 pounds, 2.75 kilograms
EnamelPaint, light gray
Gold Iridite
50-Pin Microribbonmale
25-TwistedPair, unshielded, or
50-ConductorFlat Ribbon Cable
TW Intercom;
Audio Line Connector
XLR type, 3-pin female
Line Cable
Type
Belden 8723 twin pair or
equivalent
SerialData Connector
9 pin "D" male
SerialData Loop-Through
9 pin "D"female
Headset Connector
DynamicMic XLR-type, 5-pin female
CarbonMic
+" phonejack, 3 circuit
Power Supply 4pincircular
Page 1-6

TECHNICAL MANUAL
Model 84814 MatrixIntercom Station/Model DC&Q8 Data Concentrator
1.23 MODEL DC848 DATA CONCENTRATORSPECIFICATIONS
Connections
Connection to Terminalor Modem: 5101: RS232
TerminalMode
DECVTlOO or equivalent.
Settings:
%00 baud, 8bits, 1 startbit, 1 stopbit, no parity.
Modem Mode
Remote terminalto emulateDECVTlOO or equivalent.
Settings:
9600/4800/2400/1200/600/300 baud, software
selected, 8 bits, 1 startbit, 1 stop bit, no parity.
Connection tostring
of Model 848A stations:5102/5103: RS422,
Parameters
RS485half duplexserialcommunicationnetwork
78.6 kilobaud, 8 bits,
1 start, 1 stopbit.
Power And Mechanical
Power Requirements 12volts ac
/ 0.15 amperes145-440hertz.
Power SupplyModule
Power Requirementsfrom Mains: 10volt-amperes, typical
15 volt-amperes, maximum
50 volt-amperessurge, 25 milliseconds
Dimensions
Weight 2.2
pounds, 1 kilogram
Finish
Front panel
Rear Housing EnamelPaint, light grey gold iridite
0 dBu
= 0.775 volts r.m.s.
0 dBm
= 1 milliwatt
NOTE: All product information and specificationsare subjectto changewithout notice.
Page 1-7

TECHNICALMANUAL
Model 84814 MatrixIntercom Station/Model DC848Data Concentrator
Figure 2-1
Model 848A Rear Panel
Page 1-8