RTS TWI222, TWI224, TW1222-T, TW1222-CM, TWI-SK7O-DCU Technical Manual
TECHNICAL MANUAL
I
MODEL
TW
Interface Units
TM3600
TW1222
1
OIN
9300-360040
Including
TW1222-T
TW1222-CM
TWI-SK7O-DCU
1
~~12241
Intercom System
A
Telex
RTS SYSTEMS
Communications Product
TECHNICAL
MANUAL
Model TWI224
PROPRIETARY NOTICE
The information and design disclosed herein were
originated by and are the property of RTS Systems.
RTS Systems reserves
manufacturing, reproduction, use an sales rights
thereto, and to any article disclosed therein, except to
the extent rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright
USA.
in part without written permission from RTS Systems
is
prohibted.
1988
by
ALI
rights reserved. Reproduction in whole or
all
patent, proprietary design,
RTS Systems, Burbank, California,
/TWI222
Interface Units
AND
UNPACKING INFORMATION
Immediately upon receipt of the equipment, inspect
the shipping container and the contents carefully for
any discrepancies or damage. Should there be any,
notify the freight company and the dealer at once.
The shipping Model
should
Ordering Number 9000-2195-00
Ordering Number 9000-2184-00
a
contain
RTS Systems
Part Number Descriotion
9010-2195-00 Model TWI224
9010-2184-00 Model TWI222
9300-3600-00 Technical Manual
TWI224
the following components:
/
TWI222 container
INSPECTION
--
TWI224
--
TWI222
Printing History:
First Edition: July 1980
6
Second Edition: July 1989
This manual
Department of RTS Systems, whieh is responsible for
its contents.
Written by: Daniel
Edited by:
Address
to:
Director of Engineering
RTS Systems
1100 West Chestnut Street
Burbank,
is
published by the Engineering
F.
Register
Sheryl D. Thompson
all
communication regarding
CA
91506 USA
this
publication
RTS Systems
Burbank,
CA
91506 / FSCM: 60572
Page
ii
TM3600
/
Second Edition, July 1989
TECHNICAL
Model
TWI224 / TWI222
TABLE OF CONTENTS
MANUAL
Interface
Units
Unpacking Information
Table
Of
Contents
warranty
Shipping Information
SECTION
1.1
U
13
SECTION
Ref. No Ti&
21
22
23
2.4
sEClTON3: OPERATING INSTRUCTIONS
.......................
1:
INTRODUCTION
Introduction
Application
Spedbtiions
2:
INSTALLATION
RTS TO 4-Wue
RTS To 2-Wue Systems
RTS To
RTS To
.............................................................................................................................................
.......-
.........................................................................................................................................
"...,.,
...........
-......---.-
.........
...........................................................................................................................................
AND
SPECIFICATlONS
...........................................................................
Guide
..............................................................................................................................
........................................................................................................................................
Cameras
2-Wm
RCAPaven
Telephone
and
Intercoms
...................................................................................................................
Wetpry
Systems
...........................................................................................................
"."--"-.."."
.-..................
"
....................................................
................................................................
...............................................................................................
............................... I ....................................................................
'
1
"
.....
"
....
..
n
...
m
v
v
1-1
1-1
1-1
2-1
22
2-3
2-5
3.1
3.2
3.3
3.4
SECI'ION
Ref.
4.1 Introduction
4.2 Fuuctid Dwcription
4.3
4.4
Introduction
RTS To 4-Wue Systems Operation
RTS To 2-Wire System Operation
RTS To 2-Wire Telephone Operation..
4:
TBEORY
No Title
TWI-222
Circuit
RTS Systems Burbank,
.....................................................
OF OPERATION
...................................................................................
Block
Description
Description
....................................................................................................................................
"
...........................................................................................
........................................................................................................
....................................................................
.
.................................
..................................................................................................
.........................................
..............................
..............................................................................................
...................................................................................................................
CA
91M6
/
FSCM:
Page
6057%
iii
TM36GU
/
Second Edition,
July
3-1
3-1
3-1
3-1
4-1
4-1
4-2
4-2
1989
Model
TECHNICAL
TwI22a
/
Twrm
MANUAL
Interface
Units
SECTION
Ref. No Title
5.1
SECTION
Ref. No Title
5:
Chaghg
6.
Introduction
How To Obtain Parts
Shipping
Fi
Back Panel mbly
Front Panel Assembly
Printed Cuaut Assembly
Fd
S-ON
7:
Document
Number
MAINTENANCE
Impedance
LISTS OF
.........................................
REPLACEABLE
..................................
PARTS
........................................................................................................ 6-1
......................................................................................................................
Lists
Assembly
...........................................
........................................................................................................................................
...............................
. .
Assembly, Model
DIAGRAMS
Schematic Diagram,
Assembly
Assembly
Engiaeering Note,
wkhg
TWI-SK70-DCU,
sheet
2
Schematic Diagram, TWISK70-DCU
Assembly
TWI-SKnrDCU, Squelch
sheet 2 of
TWISKMDCU
sheet 2 of
Schematic
Assembly
Schematic Diam,
...............................................................................................................................
..............................................................................................................................
TWUZZ
Diagram,
Diam,
Diagram, TWISK70-DCU
of
2
.....
"
......
Diagram, TWI-SK7DDCU
2
......
"
..............................................................................................................................
2
........................................
Diagram,
Dim,
......................... " ...................................................................................
Interuun Interface
P.C.B.
TWU24
P.C.B.
TWI224
TWISK70DCU
4-Wue Interface W/SAP
"
."
............................
Circuit Piggyback
Squelch
Card,
Squelch Mod For
P.C.B. Squelch M&cation
Intercom Interface
........................................................................................
"
..............................
"
.............................................................................
TWI220
Interface Layout
Hold Circuit Layout
Interface Card
Interface
,,
1024,
"
......
.................................................................................
............................................
Layout
Board
Circuit Description sheet 1 of
.."
....
"....
..
..............................................................................
TWI-SK70-DCU
TwI22a
...............................................................
................. - ..............................
..................................................................
...........................................................
...................................................................
......................................................
sheet 1 of
Chart
........................
Installation
2
...................................................
"
...........................................
"
........................................
to
Interface
2
.............................................
..........................................................
For
TWISK70-DCU
.......................................................................
.......................
Card
Layout
.....................
"
...................
..............
...................
5-1
6-1
61
6-1
6-2
6-2
6-2
6-4
7-2
7-3
74
7-5
7-6
7-7
7-8
7-9
7-10
7-11
7-l2
7-I3
7-14
7-l5
7-16
7-17
RTS
Systems
Burbank,
CA
91M6
/
FSCM:
Page
60572
iv
TM3600
/
Second
Edition,
July
1989
TECHNICAL MANUAL
TWU24
Model
SYSTEMS'
RTS
The
produds of RTS Systems, , a California ProcedureForRehuns:
corporation, are warranted to be
materials and workmanship for a
from
the
date
of
RTS Systems'
period
neees~ary to remedy mvered defects appearing in
produds returned prepaid to RTS Systems,
a
Chestnut
This
warranty doas not mver any defect, malfunction
or failure
including umeasonab1e or negligent operation, abuse,
accident, failure to follow
defective
at
moditidon and repair not authorized
Systems, and shipping
serial
numbers removed or effaced are not awered
this
warranty.
To obtain warrauty
entitled "PROCEDURE FOR
THIPPING
OR
ADJUSTMENT listed below.
This
warranty
warranty given
It
is
the
responsibility of
purchase
intended
sole
to provide, without
Street, Burbank, CaliFomb,
cad
or
improper associated equipment, attempts
TO
with
that
this
purpose.
LIMITED
WARRANTY
Free
from defects in
period
sale.
obligation during the warranty
beyond
service,
charge,
the
control of RTS Systems,
instructions
damage.
follow
parts and labor
91U)6,
in
this
Products with their
the
RETURNS"
MAN~A~FOR~REP~~-
is
the
sole and
respect to RTS
the
user to determine before
product
is
exclusive
Systems'
suitable for
/
TWI222
of one year
1100
W.
USA.
Manual,
by
RTS
by
pdures
and
pr
3'-
ucts.
the
user's
Interface Units
RETURN
If
repair
is
unit
was
purchased
IF
repair
through
RTS Systems Customer Service Department, located
at the factory,
Return Authorization Number
DO NOT
FACIY)RY
RElURN
Be prepared to provide your wmpany's name,
address,
the repair, the
description of
oUwtio11~ regarding returns for repair should be
directed to:
SHIPPING TO MANUFACIVRER FOR REPAIR
phone number, a person to contact regarding
SHIPPING INSTRUCTIONS
neeeasary, contact the dealer where
the dealer
as
directed below. They
RETURN
WITHOUT
AUTHORIZATION
type
the
defect, and
Customer Service Department
RTS Systems,
1100
W.
Burbank,
Telephone:
Telex:
TeletaX
OR ADJUSTMENT
is
not possible, phone the
will
ANY
EOWIPMENT TO
FIRST
OBTAINING
NUMBER,
and quantity of equipment, a
the
serial
number(s).
Chestnut
CA
194855
(818)
St.
91506,
USA
(818) 8407311
843-7953
this
issue
THE
a
A
ANY
INCLUDING
MERClUNTABlLlTY
DURATION
AND
ALL
THE
OF
IMPLID
IMPLIED
ARE
THIS
WARRANTY
LIMITED TO THE
EXPRESS
WARRANTY.
NEITHER
WHO SELIS
LIABLE
CONSEQUENTIAL DAMAGES OF
RTS
SYSTEMS
RTS
SYSTEMS'
FOR INCIDENTAL OR
RTS Systems Burbank
NOR
CA
WARRANTIES,
LI~~ED
TEE
DEALER
PRODUCTS
ANY
IUND.
91506
/
FSCM:
All
OF
IS
page
shipments of RTS Systems, equipment should
p&
shpper. The equipment should be shipped
original pacldng cartoa;
suitable
a substitute
be
four inches of excelsior or
material.
attention of the Customer Service Department and
must include the Return Authorization Number.
Upon com letion of repairs equipment
returned
shipper.
60572
v
via
container
wrapped
Th9600
United Parcel Service or the best available
if
that
is
not available,
that
is
rigid and of adequate
container
in
All
shipments should
S
/Second Edition, July
is
used,
the equipment should
paper
and
surrounded
similar
via
United Parcel Service or specified
shock-absorbing
be
directed to the
1989
with
be
in
the
use
any
size.
at least
will
be
If
Model
TECHNICAL MANUAL
TWI224
/
TWI222 Interface
Units
SECTION
SPECIFICATIONS
The
designed to interface RTS Systems'
other interwms. These interfaces derive operating
power from the RTS line, and are transformer
isolated to prevent ground loop interference.
package styles
style
a wnsole mount package. The rack mount version
may be ordered
panel
13
This
interface for your application.
The
system to a four wire intuwm system.
include some teldon broadcast cameras, the
MeCurdy interwm systems, radiotelephones, and
cameras
(except for
camera
or two wire mode,
TWI222 interface.
better performance..
interface
RING-SLEEVE jack on
however better performance
TWI222-CM connected directly to the Carbon Mic
system's line.
2RTSTW"systemsover2telwdrypairs.
prefered to
1:
INTRODUCTION
TWU22
similar
APPLICATION GUIDE
section is intended to help you
TWU22
and
TWIZL4
are
available - a wmpact portable
to our belt
with
interface is for interfacing an RTS
which
have waxial or
the
Hitachi
has
the option of operating in either four wire Biiteral Current Sources
use
This
The
to
a Carbon Mic system
Two
TWI222's
using
2
TWI222-Ts
series of interfaces are
packs,
a rack-mount style, and
up to
three
trkial
SK-70
the
will
with
four
result in easier
TWU22
the
Carbon
will
can
over
AND
"TW"
system to
Three
interfaces in one
select
the wneet
This
would
cable adapters
DCU).
wire
mode and our Peak Current
may
also
through
be
achieved
be
used
telephone
If
your
set
up and
be
used
a
TIP-
Mic
system,
using
to interface
Thisis
lines.
to
used
TWI222 to be
from
25
ohms to
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
determine the ad impedance of your system,
divide
120
by
the number of stations on the line. For
example,
impedance of
The TWI222-T is
system to a 2-wire wet telephone line. It includes an
electronic hold circuit.
13
Typ'ncal
Balance
Input/Output Voltages:
120
10.9
SPECIFICATIONS
Gain:
Null
Capabiity
with a
1600
ohms.
4-16
ohms (30 to 7 stations). To
divided
ohms.
designed
Drive.
a
line
by
11
14
20
-30 dBm to
10
impedance ranging
stations yields a line
to interface an RTS
to
20
dB each direction
dB
+10
dBm
mA
(200
ohms)
The
TWI222 interfaces are for interfacing an RTS
two
system to other
TWU22
the
The
systems to interwm systems
200
The
is supplied in
TWI222,
TWU22
ohms nominal, with a range of
impedance may be user selected, allowing the
the TWI222-CM, and the TWI222-T.
is designed to interface RTS
RTS Systems Burbank,
wire intercom systems. The
three
different wnIigurations,
with
a line impedance of
100
to
CA
91506
400
/
7%'"
ohms.
ESCM.
Page
60572
1-1
Th9600
/
Sewnd Edition, July
1989
Model
TECHNICALMANUAL
TWI22A
/
TWI222
Interface
Units
SECI'ION
2.1
Turn
TWI-224.
224.
2-1.
terminate the
2:
RTS
TO
d
gain
Conneb
Coaned the talk
This
talk
INSTALLATION
&WIRE
and balance cont~oIs to
bus must present
TWI-224
WLMERAS
the Listen bus of the 4-wire system to pins
bus
of
4-wire output with
AND
INTERCOMS
minimum.
the
4-wire system to pins 3 and 4 of the 4-pin front-panel
a
100
ohm to
a
400
200
Connect
ohm
ohm
114
the
RTS
1
impedance
watt
resistor.
line to the
and
2
to the output of
RTS
of the +pin frontpanel
LINE
XLR
the
TWI-224.
jack
on the rear of the
XLR
on the
as
shown in figure
If
it does not,
TWI-
TO TALK BUS
4
WIRE IN
-
FOR W1224-RM(E) UNITS USE A4F (FEMALE) CONNECTOR
RTS
Systems Burbank,
Fire
Connector And Cable
CA
915061
FSCM
Wiring
Page
2.1
60572
2-1
For The
TWWO/
LO
FROM LISTEN BUS
TWI-224
Second Editioq
July
1989
22
RTS
TO
2-WIRE
SYSTEMS
Model
TECHNICAL MANUAL
lWE24
/
TWI222
Interface
Units
First cob that the
does
not,
see
section
Turn
all
gain
and balanffi controls to minimum.
TWI-222.
2.
This
Conned
input
is
the
capacitor coupled and
external
55
intercom system
on
how to change the impedance of the
external
intercom line to pins 3 and 4 of the front-panel
can
has
Connect
withstand
4
<
3
a nominal impedance of
TWI-222.
the RTS line to the RTS
dc
line
voltage-s
2
WIRE IN/OUT LO
as
high
2QO
as
ohms
LINE
XLR-4
25
volts
HI
(100
to
400
jack
on the rear of the
wnnector.
actual).
See
figure
If
it
2-
2
:
1
-
FOR TW1222-RM(E) USE
RTS Systems
Connector
Burbank,
CA
And
915061
Cable
Figure
FSCM:
Page
A4F
23
Wiring
60572
2-2
N/C
For The
TM3600/
(FEMALE) CONNECTOR
TWI-222
Second
Edition,
July
1989
23
RTS
TO
2-WIRE
Turn
all
gain
and balance controls to
LJNE
jack on the rear of the
~~nnedor.
as
high
Polarity
as M volts.
Model
TWI224 / TWI222
TELEPHONE
TWI-222T.
is
not important. See figure
WET/DRY
minimum,
Connect the telephone line to pins 3 and 4 of the front-panel
TECHNICAL
switch
tebhold switch oE Conned the
2-3.
This
MANUAL
Interface
input
is
capacitor coupled and
Units
RTS
line to the
can
withstand voltages
RTS
XLR-4
On rack mount interfaces
front-pel
See
figure
XLR-4.
2-4.
Do
Thus
not
use
(lWI-222T-RM),
the
tip and
both
jacks
ring
of the rear phone jack may
at
the
-
4
<
3
2
<
2
<
1
the rear panel stereophone jack
be
used
same
time.
WIRE IN/OUT
N/C
is
connected in parallel
instead of the front
TIP
TO TELEPHONE
RING
XLR-4
LINE
with
the
jack.
FOR TW1222-T-RM(E) USE A4F (FEMALE) CONNECTOR
RTS
Systems Burbank,
Fire
Connector And Cable
CA
915061
FSCM:
Wiriag
Page
23
60572
2-3
For The
TMbCQ/
TWI-222-T
Second
Edition,
July 1989
Model
TECHNICAL
lWI224
/
TWI222
MANUAL
Interface
Units
TO
TWI-222-
T-RM
REAR
PANZL
-
RI
TO
TELEPKNJE
RTS
Systems Burbank,
Connector
CA
And
Cable
91506/
Figure
Wi
FSCM:
60572
Page
2-4
For
2-4
The
TWI-m-T-RM
Th9600/
Second
Edition,
July
1989
2A
RTS
TO
RCA/DAVEN
Model
SYSTEMS
TECHNICAL
TWI224
/
TWI222
MANUAL
Interface Units
TWI-224
The
jacks. Use the cable shown
are
There
resulting
7).
than
TO
XLR-4
ON
TWI-224
may
be
disadvantages to
in
excesiw
sidetone on both
wnnected to a Carbon
in
figure
25.
Turn
this
method. The return
systems.
Mic
system through one of
gain
and balance controls to minimum.
signal
from
the
carbon
This
is
usually
suitable for a
TO
its
user station's
mic system
small
TIP
JACK
MIC
TIP-RING-SLEEVE
can
not be nulled out
number of stations (less
-
RING
-SLEEVE
ON
CARBON
SYSTEM
To WMed a
rear
panel of
XLR-4
conneetor. See figure
SWITCHCRAFT SWITCHCRAFT
A4-M
TWI-22Z-CM
the
TWI-222-CM.
RTS Systems Burbank,
to a Carbon
Connect the
2-2
Adapter Cable XAC
Mk
Sysrem, connect the RTS line to the RTS
line
of the
CA
9W/
FSCM:
Figure
Carbon
605'72
Page
2-5
25
244-1
TM3MX)
~0~~~8267,
#483
Mic system to pins 3 and 4 of the front-panel
/
Second Edition,
or
LINE
July
PLUG
#
482,
PJ-0518
wmector on the
1989
SECllON
3.1
3:
INTRODUCTION
TECHNICAL
Model
TWU24
OPERATING INSTRUCTIONS
/
TWI222
MANUAL
Interface Units
After making connections as desaii in section
is
the unit
describes how to adjust and operate
installations
system
readjustment may
32
RTS
After making the dons described in don
set
all
to minimum.
system on Establish that both systems are operating
properly.
Plug a carbon miaophone headset into
MIC ONLY jack located on the rear panel.
Increase the GAIN FROM RTS to
Hum into the carbon miaophone and adjust
BALANCE FROM RTS until
obtained.
With
one person
on the &wire system, adjst the GAIN controls
both people
33
RTS
After making
se3
all
GAIN and BALANCE controls on the
to minimum.
Zwire system.
operating properly.
Plug a carbon miaophone headset into the
CARBON-MIC-ONLY jaek on the
ready to
dadbed
is
adjusted, any
TO
4-WIRE
GAIN and BALANCE controls on the
Turn
can
hear
TO
2-WIRE
the
Turn
be
adjusted.
This
each
in
don
part
be
required. minimum.
SYSTEMS OPERATION
power to the RTS and the 4-wire
on
the RTS
each
other clearly.
SYSTEM
comeetions desaid in sectinn
on the
Con6nn
power
2
4
after
of the system changes, Decrease the GAIN FROM RTS control to
the
CARBON
50%.
the.
best null
"rW"
line and another
OPERATION
to the RTS and the
that
both systems are
rear
2
section and adjust
of the
the
2%
TWU24
is
until
22
TWI222
of the
TWI222.
Set the BALANCE FROM RTS control
approximately
Inaease the GAIN FROM RTS control to maximum.
50%.
to
Speak or hum into
the
a null
is
obtained.
Use an RTS user station to listen on the RTS system.
Turn
the
microphone off and volume to maximum.
Increase the GAIN TO RTS to maximum.
Adjust the BALANCE TO RTS control for a null in
the
noise as heard on the RTS system.
Reduce
The
taken not to disturb the balance controls.
improperly balanced interface may oscillate.
Set both
Have
through
person
3.4
After
turn
gain
system on and verify that the system works.
Plug a carbon miaophone headset into the CARBON
MIC ONLY
rack mount versions ('IWKZI-T-RM)
jack
Set the BALANCE FROM RTS control to
approximately
Increase
the
GAIN TO RTS to minimum.
interface
gain
controls to approximately
two people establish two-way communication
the interfaec; adjust
can
be
RTS
TO
2-WIRE
making the wnnections described in section
the
TEE0 HOLD switch off and
controls to minimum.
jack on the rear of the TWIlU-T. On
is
on the front panet
the
GAIN FROM RTS control to maximum.
the
carbon microphone headset
BALANCE FROM RTS control
is
now balanced and care should
25%.
the
gains
so
that each
heard clearly.
TELEPHONE OPERATION
all
level and
Turn
power to the RTS
the
carbon mic
50%.
until
be
An
23,
RTS Systems Burbad,
CA
91506 / FSCM:
Page
60572
3-1
TM3600
/
Seeond Edition, July
1989
TECHNlCAL
Model
TWIZ24
Speak or hum into the carbon microphone headset
and adjust the
a
null
is
BALANCE
obtained.
FROM
RTS control
/
until
MANUAL
TWU22
Interface
Units
Decrease the
minimum.
Use
an RTS user station to listen
Turn
the microphone off
Increase the
Adjust
the noise
Reduce the GAIN
The
taken
improperly balanced interface
Set both
Have
through
person
the
as
interface
not to
gain
two
the
can
GAIN
GAIN
BALANCE
heard
is
now balaaced and
disturb
controls to approxhately
people establish two-way wmmunication
interface; adjust the
be
heard
FROM
and
TO
RTS to maximum.
TO
on
the RTS system.
TO
RTS to minimum.
the
dearly.
RTS control to
on
the
RTS
volume to maximum.
RTS control
balance wntrok.
may
for
care
odate.
25%.
gains
so
a null in
ahodd
that each
system.
be
An
RTS Systems Burbank,
CA
91M6
/
FSCM:
Page
60.572
3-2
Seaond
Edition,
July
1989
TECHNICAL
Model
TWI224 / TWI222
MANUAL
Interface
Units
SECTION
4.1
Section 4 deseni how the
wire
43
Figure
eonnebm
4:
THEORY OF OPERATION
INTRODUCTION
models.
FUNCTIONAL Dm-ON
Sedon
4-1
shows the block
at
the lower lett
43
describes
TWI224
the
diagram
LML
works. Section
Telco Hold circuit
of the
TWI224.
CURRENT SOURCE
42
desuibes the circuit
which
is
used
The
RTS
"ZW"
5mAfiOLT
RING
GAIN TO
as
used
in
the TWI222-T and
intercom
LEVEL
RTS
comects to the
in
both the We and
TWI222-T-RM.
XLR-3-31
'A
XLR-4-31
2-
XLR-3-31 CURRENT SOURCE
RTS
YiE
IN
RACK
AN
XLR-4-32
RTS Systems Burbank,
MOUNT
(-RM)
(MALE).
CA
9U06
TWI224
/
WCM:
(E)
Figure
Block
Page
VERSIONS.
4-1
Diagram
60572
Th9600
4-1
CONNECTOR
/
Second Edition,
July
1s
1989
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