RTS TWI222 User manual

TECHNICAL MANUAL
TM3600 1 OIN 9300-360040
I MODEL TW1222 1 ~~12241
Including
TW1222-T
TW1222-CM
TWI-SK7O-DCU
TW IntercomSystem
Interface Units
RTS SYSTEMS
A Telex Communications Product

TECHNICAL MANUAL
ModelTWI224 /TWI222 InterfaceUnits
PROPRIETARYNOTICE
The information and design disclosed herein were
originated by and are the property of RTS Systems.
RTS Systems reserves
all patent, proprietary design,
manufacturing, reproduction, use an sales rights
thereto, and to any article disclosedtherein, exceptto
the extent rightsareexpresslygrantedtoothers.
COPYRIGHTNOTICE
Copyright 1988
by RTS Systems,Burbank, California,
USA.
ALI rightsreserved. Reproduction inwhole or
in part withoutwritten permission from RTS Systems
is prohibted.
UNPACKING INFORMATION
AND INSPECTION
Immediatelyupon receipt of the equipment,inspect
the shipping containerand the contents carefullyfor
any discrepancies or damage. Should therebe any,
notify the freightcompanyand the dealerat once.
The shippingModel
TWI224 / TWI222container
should
contain the followingcomponents:
OrderingNumber 9000-2195-00
-- TWI224
OrderingNumber 9000-2184-00
-- TWI222
RTS Systems
a Part Number Descriotion
9010-2195-00 ModelTWI224
9010-2184-00 Model TWI222
9300-3600-00 TechnicalManual
PrintingHistory:
6
FirstEdition: July 1980
SecondEdition: July 1989
This manual
is publishedby the Engineering
Department of RTS Systems,whieh is responsiblefor
its contents.
Written by: Daniel
F. Register
Editedby: SherylD. Thompson
Address
all communicationregarding this publication
to:
Directorof Engineering
RTS Systems
1100West Chestnut Street
Burbank,
CA 91506USA
RTS Systems
Burbank, CA 91506 / FSCM: 60572 TM3600 / SecondEdition, July 1989
Page
ii

TECHNICAL MANUAL
Model TWI224 / TWI222 Interface Units
TABLE OF CONTENTS
..
UnpackingInformation ............................................................................................................................................. n
...
Table Of Contents .......- ......................................................................................................................................... m
warranty ....................... "...,., ........... -......---.- "."--"-.."." .-.................. " .................................................... " ..... " .... v
ShippingInformation ......... ........................................................................................................................................... v
SECTION 1: INTRODUCTION AND SPECIFICATlONS
1.1 Introduction ........................................................................... ................................................................ 1-1
U Application Guide .............................................................................................................................. 1-1
13 Spedbtiions ........................................................................................................................................ 1-1
SECTION 2: INSTALLATION
Ref.No Ti&
21
RTS TO 4-Wue Cameras and Intercoms ............................................................................................... 2-1
22
RTS To2-Wue Systems ................................................................................................................... 22
23
RTSTo 2-Wm Telephone Wetpry ............................... I .................................................................... 2-3
2.4 RTS To
RCAPaven Systems ........................................................................................................... 2-5
sEClTON3: OPERATING INSTRUCTIONS
' 1
3.1 Introduction
..................................................... " ........................................................................................... 3-1
3.2 RTS To4-Wue SystemsOperation
........................................................................................................ 3-1
3.3
RTS To2-WireSystemOperation .................................................................... . ................................. 3-1
3.4 RTS To2-Wire TelephoneOperation..
.................................................................................................. 3-1
SECI'ION
4: TBEORY OFOPERATION
Ref. No Title
4.1 Introduction
................................................................................... ......................................... 4-1
4.2 FuuctidDwcription .............................. .............................................................................................. 4-1
4.3 TWI-222 Block Description ................................................................................................................... 4-2
4.4
Circuit Description .................................................................................................................................... 4-2
RTS Systems Burbank,
CA 91M6 / FSCM: 6057% TM36GU / SecondEdition, July 1989
Page iii

TECHNICAL MANUAL
Model TwI22a / Twrm Interface Units
SECTION 5: MAINTENANCE
Ref. No Title
5.1
Chaghg Impedance ......................................... ........................................................................................ 5-1
SECTION 6. LISTS OF REPLACEABLE PARTS
Ref. No Title
Introduction
.................................. ........................................................................................................ 6-1
How To ObtainParts ...................................................................................................................... 6-1
Shipping Lists ........................................... " .............................. ............................................................... 61
Fi Assembly ........................................................................................................................................ 6-1
Back Panelmbly ............................... " ............................................................................. ..................... 6-2
Front PanelAssembly ............................................................................................................................... 6-2
. .
Printed CuautAssembly .............................................................................................................................. 6-2
Fd Assembly,Model TWUZZ ......................... " ................................................................................... 6-4
S-ON 7: DIAGRAMS
Document
Number
SchematicDiagram, Interuun Interface TWI220 ................. - .............................. ....................... 7-2
Assembly Diagram, P.C.B. TWU24 InterfaceLayout .................................................................. 7-3
Assembly Diam, P.C.B. TWI224 Hold CircuitLayout ........................................................... 74
EngiaeeringNote, TWISK70DCU InterfaceCard ................................................................... 7-5
wkhg Diagram, TWISK70-DCU Interface ,, ...................................................... " ................... 7-6
TWI-SK70-DCU,
4-Wue InterfaceW/SAP 1024, sheet 1 of 2 ................................................... 7-7
sheet 2 of 2 ..... " ...... " ." ............................ " ...... ................................................................................. 7-8
SchematicDiagram,TWISK70-DCU ............................................ " ........................................... 7-9
Assembly Diagram, TWI-SK7DDCU Layout Chart ........................ " ........................................ 7-10
TWI-SKnrDCU,Squelch
CircuitPiggyback Board Installation to Interface Card .............. 7-11
sheet 2 of 2 ...... " .............................................................................................................................. 7-l2
TWISKMDCU Squelch Card, CircuitDescriptionsheet 1 of 2 ............................................. 7-I3
sheet 2 of 2 ........................................ .." .... ".... .. .............................................................................. 7-14
Schematic Diagram, SquelchMod For TWI-SK70-DCU .......................................................... 7-l5
Assembly Dim, P.C.B. SquelchM&cation For TWISK70-DCU Layout ................... 7-16
SchematicDiam, IntercomInterface TwI22a ....................................................................... 7-17
RTS Systems Burbank, CA 91M6 / FSCM: 60572 TM3600 / Second Edition, July 1989
Page iv

TECHNICAL MANUAL
Model
TWU24 / TWI222 InterfaceUnits
RTS
SYSTEMS' LIMITED WARRANTY
RETURN SHIPPING INSTRUCTIONS
The produds of RTS Systems, , a California ProcedureForRehuns:
corporation,are warranted to be
Free from defects in
materials and workmanship for a
period of one year
If repair is neeeasary, contact the dealer where this
from the date of sale. unit
was purchased
RTS Systems'
sole obligation during the warranty
period a to provide, without charge, parts and labor
neees~aryto remedy mvered defects appearing in
produds returned prepaid to RTS Systems,
1100 W.
Chestnut Street, Burbank, CaliFomb, 91U)6, USA.
This warranty doas not mver any defect, malfunction
orfailure
cad beyond the control of RTS Systems,
includingumeasonab1e or negligent operation, abuse,
accident, failuretofollow
instructions in this Manual,
defective
or improperassociated equipment, attempts
at moditidon and repair not authorized by RTS
Systems, and shipping
damage. Products with their
serial numbers removed or effaced arenot awered by
this warranty.
To obtain warrauty
service, follow the pdures
entitled "PROCEDURE FOR
RETURNS" and
THIPPING TO MAN~A~FOR~REP~~-
OR ADJUSTMENTlisted below.
This warranty is the sole and exclusive
warrantygiven with respecttoRTS Systems' pr 3'- ucts.
It
is the responsibilityof the user todeterminebefore
purchase
that this product is suitable for the user's
intended
purpose.
ANY AND ALL IMPLID WARRANTIES,
INCLUDING THE IMPLIED WARRANTY OF
MERClUNTABlLlTY ARE LIMITED TO THE
DURATION OF THIS EXPRESS LI~~ED
WARRANTY.
NEITHER RTS SYSTEMS NOR TEE DEALER
WHO SELIS
RTS SYSTEMS' PRODUCTS IS
LIABLE FOR INCIDENTAL OR
CONSEQUENTIALDAMAGES OF
ANY IUND.
IF repair through the dealer is not possible, phone the
RTS Systems Customer Service Department, located
at the factory,
as directed below. They will issue a
ReturnAuthorization Number
DO NOT RETURN ANY EOWIPMENT TO THE
FACIY)RY WITHOUT FIRST OBTAINING A
RElURN AUTHORIZATION NUMBER,
Be prepared to provide your wmpany's name,
address, phonenumber, a person tocontact regarding
the repair, the
type and quantity of equipment, a
descriptionof
the defect, and the serial number(s).
oUwtio11~regarding returns for repair should be
directed to: Customer ServiceDepartment
RTS Systems,
1100 W. Chestnut St.
Burbank,
CA 91506, USA
Telephone:
(818) 8407311
Telex: 194855
TeletaX [phone]
SHIPPINGTO MANUFACIVRERFOR REPAIR
ORADJUSTMENT
All shipments of RTS Systems, equipment should be
p& via United ParcelServiceor thebest available
shpper. The equipment should be shipped
in the
originalpacldngcartoa;
if that is not available, use any
suitablecontainer
that is rigid and of adequate size. If
a substitute container is used, the equipment should
be wrapped in paper and surrounded with at least
four inches of excelsior or
similar shock-absorbing
material.
All shipments should be directed to the
attention of the Customer Service Department and
must includethe ReturnAuthorizationNumber.
Upon com letion of repairs equipment
will be
shipper.
S returned
via United ParcelServiceor specified
RTS SystemsBurbank
CA 91506 / FSCM: 60572 Th9600 /Second Edition,July 1989
page v

TECHNICALMANUAL
Model TWI224 / TWI222 Interface Units
SECTION 1: INTRODUCTION AND
SPECIFICATIONS
The TWU22 and TWIZL4 series of interfaces are
designed to interface RTS Systems'
"TW" system to
other interwms. These interfaces derive operating
power from the RTS line, and are transformer
isolated to prevent ground loop interference.
Three
package styles are available - a wmpact portable
style
similar toour belt packs, a rack-mount style, and
a wnsole mount package. The rack mount version
may be ordered
with up to three interfaces in one
panel
13 APPLICATIONGUIDE
This section is intended to help you select the wneet
interfaceforyour application.
TWI222 to be
used with a line impedance ranging
from
25 ohmsto 1600 ohms.
The TWI222-CM is designed to interface an RTS
"TW" system directly to an RCA/DAVEN type
ca~bon mimophone intercom system, with an
impedance of
4-16 ohms (30 to 7 stations). To
determine the adimpedance of your system,
divide
120 by the number of stations on the line. For
example,
120 divided by 11 stations yields a line
impedanceof
10.9 ohms.
The TWI222-T is
designed to interface an RTS
system to a 2-wire wet telephone line. It includes an
electronichold circuit.
The TWU22 interface is for interfacing an RTS
system to a four wire intuwm system.
This would 13 SPECIFICATIONS
include some teldon broadcast cameras, the
MeCurdy interwm systems, radiotelephones, and
Typ'ncal Gain: 14 to 20 dB eachdirection
cameras
which have waxial or trkial cable adapters Balance
Null Capabiity 20 dB
(except for
the Hitachi SK-70 with DCU). If your Input/Output Voltages: -30 dBm to
+10 dBm
camera
has the option of operatingin either fourwire Biiteral Current Sources
or two wire mode,
use the four wire mode and our Peak Current Drive.
10 mA (200 ohms)
TWI222interface.
This will result in easier set up and
betterperformance..
The TWU22 may also be used to
interface
to a Carbon Mic system through a TIP-
RING-SLEEVE jack on the Carbon Mic system,
however better performance
will be achieved using a
TWI222-CM connected directly to the Carbon Mic
system's line.
Two TWI222's can be used tointerface
2RTSTW"systemsover2telwdrypairs. Thisis
prefered to
using 2 TWI222-Ts over telephone lines.
The TWI222 interfaces are for interfacing an RTS
system to other
two wire intercom systems. The
TWU22 is supplied in three different wnIigurations,
the
TWI222, theTWI222-CM, and the TWI222-T.
The TWU22 is designed to interface RTS 7%'"
systemsto interwm systems with a line impedanceof
200 ohms nominal, with a range of 100 to 400 ohms.
The impedancemay be user selected,allowing the
RTS SystemsBurbank,
CA 91506 / ESCM. 60572 Th9600 / SewndEdition, July 1989
Page 1-1

TECHNICALMANUAL
Model TWI22A / TWI222 Interface Units
SECI'ION 2: INSTALLATION
2.1 RTS TO &WIRE WLMERAS AND INTERCOMS
Turn d gain and balance cont~oIsto minimum. Connect the RTS lineto the RTS LINE jack on the rear of the
TWI-224. Conneb the Listenbus of the 4-wire system to pins 1 and 2 of the +pin frontpanel XLR onthe TWI-
224.
Coaned the talk bus of the 4-wire systemtopins 3 and 4 of the 4-pin front-panel XLR as shown in figure
2-1. This talk busmust present a 100 ohm to 400 ohm impedance tothe outputof the TWI-224. If it doesnot,
terminate the
TWI-224 4-wire outputwith a 200 ohm 114 watt resistor.
4 WIRE IN LO
TO TALK BUS
FROM LISTEN BUS
-
FOR W1224-RM(E) UNITS USE A4F (FEMALE) CONNECTOR
Fire 2.1
ConnectorAnd Cable Wiring ForThe TWI-224
RTS SystemsBurbank, CA 915061 FSCM 60572 TWWO/ Second Editioq July 1989
Page 2-1

TECHNICALMANUAL
Model lWE24 / TWI222 Interface Units
22 RTS TO 2-WIRE SYSTEMS
First cobthat the external intercomsystem has anominal impedanceof 2QO ohms (100 to 400 actual). If it
does not, see section 55 on how to changethe impedance of the TWI-222.
Turn all gain and balanfficontrols to minimum. Connect the RTSline to the RTS LINE jack on the rear of the
TWI-222. Conned the external intercomlinetopins 3 and 4 of the front-panel XLR-4 wnnector. See figure 2-
2. This input is capacitor coupledand can withstand dc line voltage-s as high as 25 volts
FOR TW1222-RM(E) USE A4F (FEMALE) CONNECTOR
4
< 3
2
: 1
-
Figure 23
Connector And Cable Wiring For The TWI-222
HI
2 WIRE IN/OUT LO
N/C
RTS Systems Burbank, CA 915061 FSCM: 60572 TM3600/ Second Edition, July 1989
Page 2-2

TECHNICAL MANUAL
Model TWI224 / TWI222 Interface Units
23 RTS TO 2-WIRE TELEPHONE WET/DRY
Turn all gain andbalance controlsto minimum, switch tebholdswitchoE Connedthe RTS lineto the RTS
LJNE jack on the rear of the TWI-222T. Connectthe telephone linetopins 3 and 4 of the front-panel XLR-4
~~nnedor. Polarity is not important. Seefigure 2-3. This input is capacitor coupledand can withstandvoltages
as high as M volts.
Onrack mount interfaces
(lWI-222T-RM), the rear panel stereophonejack is connectedin parallel with the
front-pel
XLR-4. Thus the tip and ring of the rear phonejack may be used instead of the front XLR-4 jack.
See figure 2-4. Do not use both jacks at the same time.
I
i
I
I
I
I
I
I
I
I
I
I
I
FOR TW1222-T-RM(E) USE A4F (FEMALE) CONNECTOR
I
I
I
I
I
I
-
4 TIP
< 3 2 WIRE IN/OUT RING
< 2
< 1 N/C
TO TELEPHONE
LINE
Fire 23
ConnectorAnd Cable Wiriag ForThe TWI-222-T
RTS SystemsBurbank, CA 915061 FSCM: 60572 TMbCQ/ Second Edition, July 1989
Page
2-3

TECHNICAL MANUAL
Model lWI224 / TWI222 Interface Units
TO
TO TELEPKNJE
TWI-222-
T-RM - RI
REAR
PANZL
Figure 2-4
Connector And Cable Wi For The TWI-m-T-RM
RTS SystemsBurbank, CA 91506/ FSCM: 60572 Th9600/ Second Edition, July 1989
Page 2-4