215665 9701_Silent_700__720_730_Operating_Instructions_Aug_1970 9701 Silent 700 720 730 Operating Instructions Aug 1970
User Manual: 215665-9701_Silent_700__720_730_Operating_Instructions_Aug_1970
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SILENT 700
Electronic Data Terminal
//~n\ Model 720/30 Series
li\VW)
\".....~
. 8&1'
Operating li1structions
MANUAL NO. 215665-9701
REVISED 14 AUGUST, 1970
TEXAS INSTRUMENTS
INCORPORATED
DIGITAL. ilviiTP. QIVI.loN
P.O. BOX e8027
HOUSTON. TEXAS 77008
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Copyright 1970
B-y
Texas Instruments Incorporated
All Rights Reserved
The information andlor drawings set forth in this document and all rights in
and to inventio_ns disclosed herein and patents which might be granted thereon
disclosing or employing the materials, methods, techniques or apparatus
described herein are the exclusive property of Texas Instruments Incorporated.
No disclosure of the information.or drawings shall be made to any other person
or organization without the prior consent of Texas Instruments Incorporated.
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IMPORT ANT NOTICE
Only use paper in this equipment which meets the requirements of TI
Specification 213714. Other papers may permanently damage the printhead
and/or mechanism.
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TABLE OF CONTENTS
Section
Page
GENERAL DESCRIPTION . . . . . . .
1-2 Scope of Manual . . . . . . . . . . .
1-2 Description of Equipment .....
1-2.1 Model720 . . . . . . . . . . . . . .
1-2.2 Model721 . . . . . . . . . . . . . .
1-2.3 Model722 . . . . . . . . . . . . . .
1-2A Model 723 . . . . . . . . . . . . . .
1-2.5 Model730 . . . . . . . . . . . . . .
1-2.6 Model731 . . . . . . . . . . . . . .
1-3 Standard Equipment . . . . . . . .
1-3.1 Keyboard and Transmisssion
Code . . . . . . . . . . . . . . . . .
1-3.2 Data Format . . . . . . . . . . . .
1-3.3 Communication Interface ... .
1-3.4 Auxiliary Device Interface
1-3.5 Interrupt . . . . . . . . . . . . . . .
1-3.6 Parity Checking . . . . . . . . . .
1-4 Options . . . . . . . . . . . . . . . . .
1-4.1 40 Character/Second Operation
(Model 720/21) . . . . . . . . . .
1-4.2 Answer-Back Memory
(Model 720/30) . . . . . . . . . .
1-4.3 Lower Case (All Models)
1-4.4 Built-In Data Sets . . . . . . . . .
1-5 Specifications . . . . . . . . . . . . .
1-5.1 Printer . . . . . . . . . . . . . . . .
1-5.2 Physical . . . . . . . . . . . . . . .
II
INSTALLATION AND CHECKOUT
2-1 Equipment Installation . . . . . . .
2-1.1 Power Connections . . . . . . . .
2-1.2 Communication Interface
Connection . . . . . . . . . . . . .
2-1.3 Auxiliary Input/Output
Device Connection
...... ,
Section
1-1
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-2
III
1-2
1-3
1-3
1-5
1-5
1-6
1-6
1-6
1-6
1-6
1-6
1-6
1-7
1-8
2-1
2-1
2-1
2-2
APPENDIX A
2-2
iii
Page
2-1.4 Model 722 Connection .. ..
2-1.5 Model 723 Connection .. . .
2-2 Preliminary Checkout ..... ,
2-3 Paper Loading .. . . . . . . . . .
2-4 Programming the
Answer-Back Memory . . . . ..
2-2
2-2
2-5
2-5
EQUIPMENT OPERATION . . . . .
3-1 General . . . . . . . . . . . . . . .
3-1.1 Model 720/30 . . . . . . . . . .
3-1.2 Power Switch . . . . . . . . . .
3-2 Controls . . . . . . . . . . . . . ..
3-3 Condition Indicators
3-4 Operating Sequence . . . . . . .
3-4.1 Operation With A
Remote Device . . . . . . . . .
3-4.2 Operation With Auxiliary
Input Device . . . . . . . . . . .
3-4.3 Operation With Auxiliary
Output Device . . . . . . . . . .
3-4.4 Operation With
Answer-Back Memory .....
3-5 Model 721/31
Operating Sequence . . . . . . .
3-5.1 Operation With A
Remote Device . . . . . . . . .
3-5.2 Remote Device and Auxiliary
Output Device . . . . . . . . . .
3-6 Model 722 Operating Sequence
3-7 Model 723 . . . . . . . . . . .. .
3-7.1 Controls . . . . . . . . . . . . . .
3-7.2 Condition Indicators .... .
3-7.3 Operating Sequence ..... .
3-8 Abnormal Events . . . . . . . . .
3-1
3-1
3-1
3-1
3-2
3-2
3-2
2-6
3-4
3-4
3-4
3-4
3-4
3-4
3-4
3-5
3-5
3-5
3-5
3-5
3-5
A COMPARISON BETWEEN TELETYPE
KEYBOARD AND MODEL 720/730
KEYBOARD
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LIST OF ILLUSTRATIONS
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Page
Figure No.
1-1
1-2
1-3
1-4
2-1
2-2
2-3
2-4
2-5
2-6
silent 700 Electronic Data Terminal
Serial Data Timing Diagram . . . . . . .
Code System and Character Set
Outline Dimensions . . . . . . . . . . . .
120V and 240V Operations . . . . . . .
Terminals Connections . . . . . . . . . .
TTY Neutral Interface Model 730,
Full Duplex Wiring Diagram . . . . . . .
TTY Neutral Interface Model 730,
Half Duplex Wiring Diagram . . . . . .
TTY Neutral Interface Model 731,
Receive Only Wiring Diagram . . . . . .
TTY Polar Interface Model 730,
Full Duplex Wiring Diagram . . . . . . .
Page
Figure No.
2-7
1-1
1-2
1-7
1-8
2-1
2-1
2-8
3-1
3-2
3-3
2-3
2-3
3-4
2-4
3-5
TTY Polar Interface Model 731,
Receive Only Wiring Diagram . . . . . .
Paper Loading Diagram . . . . . . . . . .
Internal Controls . . . . . . . . . . . . . .
Model 720/30 Keyboard
Arrangement . . . . . . . . . . . . . . . . .
Keyboard Codes Generated When
Shift and Control Keys are
not Depressed . . . . . . . . . . . . . . . .
Keyboard Codes Generated When
Shift Key is Depressed . . . . . . . . . .
Keyboard Codes Generated When
Control Key is Depressed . . . . . . . .
2-5
2-6
3-1
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3-2
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3-3
3-3
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3-3
2-4
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LIST OF TABLES
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Table No.
1-1
1-2
Table No.
Page
1-3
Model 720/21 Data Terminal
Data Set Interface Table . . . . . . . . . 1-3
Model 730/31 Data Terminal
Communication Interface
1-4
1-4
Page
Model 722/23 Data Terminal
Signal Interface Table . . . . . . . . . . . 1-4
Model 720, 721, 730, 731 Data
Terminal Auxiliary Interface Table .. 1-5
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SECTION I
GENERAL DESCRIPTION
1-1 SCOPE OF MANUAL.
inch line. The matrix is composed of 35 separate solid-state
heating elements, each electronically controlled. During the
printing operation, input data is decoded and voltage is
applied to the proper elements, causing a transfer of
thermal energy to the heat-sensitive paper which creates the
image.
This is the operating instruction manual for the Silent 700
Electronic Data Terminal, Models 720/30, produced by the
Digital Systems Division ofTexas Instruments. This manual
provides the information necessary for installation and
operation of the following models: 720, 721, 722, 723,
730, and 731 Data Terminals.
1-2.1 MODEL 720. The Model 720 terminal is a KSR
(keyboard send/receive), Input/Output unit. Choice of
speeds and options give flexibility in applications such as:
timesharing, point-to-point telecommunications, remote
access and computer console use.
1-2 DESCRIPTION OF EQUIPMENT.
The terminal is a self-contained electronic page printer
designed for a wide variety of telecommunications. (see
Figure 1-1) Silent electronic printing is achieved with the
use of a dot matrix on a monolithic solid-state printhead
that moves across the page, printing 80 characters per 8
1-2.2 MODEL 721. The Model 721 terminal is a receive-
Figure 1-1. Silent 700 Electronic Data Terminal
1-1
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only configuration of the Model 720 and incorporates an
EIA serial data interface for receipt of data transmission
over private communication lines. Areas of application
include public and private telecommunications systems as
well as wire service remote stations.
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for direct compatibility with existing terminals.
1-2.6 MODEL 731. The Model 731 terminal is a receiveonly configuration of the Model 730. It has a dc signal
interface for receipt of telegraph-grade data from wire
services and other public and private telecommunications
systems. This terminal may also be used as a hard-copy
printer for desk-top computer, calculators and computer
terminal applications.
1-2;3 MODEL 722. The Model 722 terminal is a receiveonly configuration of the Model 720 with a parallel-by-bit
data interface. It may be used as a hard-copy printer with
video data terminals, desk-top computers and calculators,
or with another remote data terminal. This terminal is
designed for hard-wire connection to a source of parallel
data output and is similar in appe~rance and operation to
the Model 721.
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1-3 STANDARD EQUIPMENT.
The terminal comes complete with printhead, control
electronics and data set interfaces.
i-3.1 KEYBOARD AND TRANSMISSION CODE
1-2.4 MODEL 723. The Model 723 terminal is a KSR
(keyboard send/ receive) configuration of the Model 720
with parallel-by-bit information interchange. It is similar in
operation to the Model 722 with the addition of a
keyboard for parallel transmission of information.
a.
1-2.5 MODEL 730. The Model 730 terminal is a KSR
(keyboard send/receive) unit similar to the Model 720 but
designed for telegraph-grade dc signal data transmission. It
has special application in areas using low-speed mechanical
teletypewriters, such as private and public telecommunications systems, remote terminals and computer consoles.
This terminal is provided with a Teletype interface circuit
-T-, I
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SPACE
(+12V)
OV
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b.
Model 720/21/30/31 - USASCII, 7-leve1, 11
bits per character including parity, start and 2
stop bits at 10 characters per second speed; 10
bits per character with 1 stop bit at higher.
speeds. Standard operating speeds of 10, 15, or
30 characters per second are provided by a
selector switch (see Figure 1-2). Printable
characters, 68 plus 4 printer control characters
and 5 terminal control characters. (See Figure
1-3.)
Model
722/23 - USASCII,
7-level,
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parallel
-T-T-'--l
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L_.L_..L_-L_-L_J.._..l.
-DATA DATA DATA DATA· DATA PARITY
DATA DATA
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MARK
(-12V)
START
BIT
'I.
T1
BIT 1
BIT 2
BIT 3
BIT4
BIT 5
BIT 6
BIT 7
~
BIT
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STOP
BIT
STOP
BIT
START
BIT
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T2
CHA RACTE RS/SEC
n(MS)
T2(MS)
10
9.09
100
15
6.66
66.6
30
3.33
33.3
40
2.50
25.0
Figure 1-2. Serial Data Timing Diagram
1-2
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Standard RS 23 2B. The signals and connector
pins involved are described in Table 1-1. A
5-foot data set cable with 25 pin connector is
supplied with terminal.
input; printable characters 68, plus 4 printer
control characters. (See Figure 1-3.)
1-3.2 DATA FORMAT
a.
b.
c.
d.
b.
Model 720/30 - An internal switch provides
choice of half or full-duplex operation. Serial
transmISSIOn is asynchronous serial-by-bit,
s e rial-by-character. Auxiliary Input/Output
parallel-by -bit, serial-by-character.
Model 721/31 - Simplex, asychronous serialby-bit, serial-by-character. Auxiliary output
parallel-by-bit, serial-by-character.
Model 722 - Simplex, asychronous parallel-bybit, serial-by-character. Terminal controlling
source must provide required serial characters
in the bit parallel. Asynchronous operation
obtained by requiring that input lines be
strobed when ready. Completion of print operation is indicated by READY-BUSY line.
c.
Model 723 - Full-duplex, asychronous parallelby-bit, serial-by-character. (Same as 722)
1-3.3 COMMUNICATION INTERFACE
a.
Model 720/21 - Data set interface per EIA
Model
730 - Teletype
interface, neutral
keying. The signals and connetor pins involved
are described in Table 1-2.
1.
Input current - 60 rnA
2.
Input switching currents - 30 mA
3.
Output current capability - 60 mA
4.
Output voltage capability - 130 VDC
5.
Signal interface - 4 spade lugs
6.
Convertible to 20 mA loop by clipping
out one resistor
Model 731 - Teletype interface, neutral
keying. The signals and connector pins involved
are described in Table 1-2.
1.
Operates in receive-only mode on 2 wires.
2.
Input current - 60 mA
TABLE 1-1
MODEL 720/21 DATA TERMINAL
SERIAL COMMUNICATION INTERFACE TABLE
Connector Pin Numbers J-13
Pin Function
Terminal (Yellow)
Data Set
1
1
Protective G rou nd 4
2
2
Transmitted Data 4
,6
NOTES
Data 4
3
4
Received
5
Clear to Send 2 ,4;6
6
7
6
Data Set Readl ,4
7
Signal G rou nd4
8
8
Data Carrier Detector4
A
20
Data Terminal Readyl
3
4
5
Request to Send l
1
,4,6
2Held to a high condition by data set during
transmission.
,4
3
Held to a high condition when data set is
operative.
4
Used only with external modem, EIA interface,
and data set cable assembly 215563-0001.
B
C
D
Communication LineS
E
S Used only with internal modem and phone line
cable assembly 215619-0001.
6
F
G
H
Held to a high condition by data terminal.
Communication LineS
1-3
Not present on Model 721.
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TABLE 1-2
MODEl 730/31 DATA TERMINAL
COMMUNICATION INTERFACE
Pin Number
Terminal (Yellow)
Pin Function
1
2
3
Teletype Line*,1
4
5
6
NOTES
1Full duplex transmitter output loop.
Teletvpe Line2 ,3
7
2
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Full duplex receiver input loop.
3 Pin 0 and Pin H must be tied together for half
duplex operation.
8
A
B
C
D
E
F
G
H
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*Not used on Model 731.
Teletype Line*,1
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Teletype Line2 ,3
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TABLE 1-3
MODEL 722/23 DATA TERMINAL
SIGNAL INTERFACE TABLE
Connector
Pin Number
1
Parallel Output
Connector (81 ue J-11)
Output from Keyboard
Data Line 18
Parallel Input
Connector (RedJ-12)
Input to Printer
Data Line 18
2
2
2
3
3
3
4
4
4
5
5
6
6
7
7
5
6
7
8
Data Line 8
Data Line 8
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11.0 ]Js minimum high pulse to indicate validity
of data lines.
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a
Signal Ground
Printer Start3 ,5
D
Input Strobe4 , 7
E
Printer Stop3 ,6
F
+0·
.
+5- 2.6 VDC for logic high
0+. 5
2
Ready/Busy 2
Signal Ground
All logic levels are TTL compatible, Le.:
-0 VDC for logic low
A
C
NOTES
Output Strobel
Held to a low condition by the terminal when a
ch~racter is being printed, indicating busy.
Not used on Model. 723.
41.0 ].Js minimum high pulse to initiate print
cycle.
I! Data
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*Not used on Model 722.
[
5100 ].Js minimum high pulse to turn on data
terminal. (Holds printer to "ON" state when
held high.
G
6100 ].Js minimum high pulse to turn off data
terminal (Ineffective if printer start held high.)
H
7 Used
to initiate printing action.
line 1 thru data line 7 corresponds to b 1
thru b 7 of ASC-II code (see Figure 1-2). Must
precede input strobe by 1 ].Js.
1-4
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e.
3.
Input switching currents - 30 mA
4.
Signal interface - 2 spade lugs
5.
Convertible to 20 rnA loop and polar
operations by clipping out resistors.
730 have identical auxiliary input and output
device interfaces. The signals and the connector
pins involved are described in Table 1-4.
b.
Model 722 - The red connector, J12, is used
to connect the terminal to a source of parallel
coded data. The signals and .connector pins
involved are described in Table 1-3.
1-3.5 INTERRUPT
Model 723
1.
The red connector, J12, is used to
connect the terminal to a source of
parallel coded data.
2.
The blue connector, J11, is used to provide connection to the terminal's parallel
keyboard output. Signals and connector
pins involved are described in Table 1-3.
a.
Model 720 - Allows operator to interrupt
transmission from computer to terminal when
necessary by means of the BREAK key. Communication is immediately established with the
remote computer by transmission of a space for
longer than 140 ms, which is interpreted as an
interrupt or break. This feature requires a
full-duplex modem and/or transmission media.
b.
Model 730 - Same procedure as Model 720,
but no modem is used. In full-duplex operation,
the break signal is transmitted on the separate
send loop while data is being received on the
1-3.4 AUXILIARY DEVICE INTERFACE
a.
Model 721/31 - Neither terminal has provisions for use of an auxiliary input device;
however both models have identical auxiliary
output device interfaces. The signals and the
connector pins involved are described in Table
1-4.
Model 720/30 - The Model 720 and the Model
TABLE 1-4
MODEL 720, 721, 730, 731 DATA TERMINAL
AUXILIARY INTERFACE TABLE
Connector
Pin
Number
1
Auxiliary Output
Connector (Red)
J·ll
Data Line 19
NOTES
Auxiliary Input*
Connector (Blue)
J·12
Data Line 19
All signals are TTL compatible, i.e.:
+5+ 0
·2.6 VDC for logic high
+5
O·b VDC for logic low
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
Data Line 8
Data Line 8
B
Signal Ground
Terminal Readys
C
Auxiliary Output
Device Start!
Signal Ground
D
Auxiliary Output
Device Strobe2
Auxiliary Input Device On 6
Auxiliary Output
Aux il iary I nput Device Stare
A
E
1100U; minimum high pulse to turn on auxiliary
output device when "DC2" is received.
2100l1s minimum high pulse to indicate validity of
output data lines.
Auxiliary I nput Device Stop4
4100115 minimum high pulse to turn off auxiliary
input device when "DC3" is received.
5 Held high to indicate terminal is ready to accept
data.
6
Held to a low condition by auxiliary input device
when operational.
7100l1s minimum high pulse to turn on auxiliary
input device when "DC1" is received.
Device Stop3
F
3100l1s minimum high pulse to turn off auxiliary
output device when "DC4" is received.
Auxiliary Input Device
Data StrobeS
G
s10.0f,ls minimum high pulse to indicate validity of
data on auxiliary input data lines.
H
9
Data line 1 thru data line 7 corresponds to b 1
thru b7 of ASC II code, (see Figure 1-2).
*Not used in Model 721 or 731.
1-5
[!
Receiver
input level -
receive loop. For half-dupleJ!:, the break signal
will break the receipt of data from the remote
transmitting unit to allow its receiver circuits to
sense the interrupt condition.
1-3.6 PARITY CHECKING. No parity check is provided
on data received. Even parity is generated with data entered
from the keyboard. Through an internal reconnection,
parity transmissions can be overridden by causing a logic
one to be continuously transmitted for thc parity bit.
Input and output
line impedances Transmit-control
function -.
operation between
+5 . dbm and -35
dbm
600/900 ohms
request to send/clear
to send, 265 ±65 mc
1-4 OPTIONS
Receive control
function -
1-4.1·.40 CHARACTER/SECOND. OPERATION (MODEL
720/21). A fixed speed for serial data transmission and
printing of 40 characters per second may be provided in
lieu of normal switch-selected speeds for Model 720 and
Model 721.
Type facility 1-4.2 ANSWER-BACK MEMORY (MODEL 720/30). A
21-character, 8-bits-per-character memory is provided.
Readout is serial-by-bit and serial-by-character, activated
remotely or loc;tlly. Readout speed is that of the terminal
transmission rate. Message is not printed or transmitted to
auxiliary data device.
2.
1-4.3 LOWER CASE {All Models). Lower case alphabetic
printing, from a 5 x 5 portion of the 5 x 7 matrix, character
size .0715 in x _080 in. giving 94 printable characters, is
provided.
Receive carrier
frequencies -
1-4.4 BUILT-IN DATA SETS.
a.
Model 720 - A field interchangeable modem
(DS100TH or DS100TL data set) may be
supplied in the form of a plug-in printed circuit
card. The connector pins involved are indicated
in Table 1-1.
1.
b.
DS100TL DATA SET - Compatible with
the Bell 103F1 originate mode transmit/
receive data set.
Modulation Transmit carrier
frequencies -
Receive carrier
frequencies -
frequency shift keying
c.
1270 Hz - mark
1070 Hz - space
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3002 line (no conditioning)
r
2225 Hz - mark
2025 Hz - space
1270 Hz - mark
1070 Hz - space
Model 721 - A field interchangeable modem
(DS100RH or DS100RL data set) may be
supplied in the form of a plug-in preintedcircuit card. The DSIOORH is the receive-only
version of the DSlOOTH. The DSIOORL is the
receive-only version of the DS100TL. The
connector pins involved are indicated in Table
1-1.
Model 730/31 - Teletype interface, polar keying. The connector pins involved are indicated
in Table 1-2.
Input currents -
5 rnA to 60 rnA
Input switching currents -
5 rnA
Output current capability -
60 rnA
Output voltage capability -
130 VDC
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2225 Hz - mark
2025 Hz - space
Transmitter
output level -
r
Carrier detect time
operate, 150 rns ±50
msr'elease, 50 ms
±25ms
DS100TH Data Set - Compatible with
the Bell 103F2answer mode transmit/
receive data set. Similar to DS100TL data
set except:
Transmit carrier
frequencies -
[;
1-5 SPECIFICATIONS.
0-15 dbm, adjustable
1-6
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1-5.1 PRINTER
e.
platen -
Friction feed
f.
Carriage/Return time -
195 milliseconds
maximum
25 milliseconds
a.
Printing method -
5 x 7 dot matrix, electronically heated, printing on
heat sensitive paper.
b.
Line length -
8 inches, 80 characters
g.
Line feed time -
c.
Line spacing -
6 lines per inch
h.
·Printable characters - up to 94, see figure 1-3
d.
Paper - ~T.I. Part
No. 213 14-0001)-'
i.
Carriage return and
Line feed (CR/LF) - Automatic at column 81,
No code is transmitted.
0
b7
b4 b 3 b2 b i
Roll, 8.5 inches wide
by 3.625 inches maximum diameter (300
feet), heat sensitive.
0
1
0 0 0 0
1
1
0
1
1
1
0
1
1
0
1
P
..
P
A
Q
a
q
2
B
R
b
r
#
3
C
S
c
s
0
0
0 0
0
0
@
SP
0 0 0
0 0
1
1
0
1
0
b6
bs
0
0 0
$
4
D
T
d
t
0
0
%
5
E
U
d
u
&
6
F
V
f
v
~
7
G
W
9
w
0 0 0
8
H
X
h
x
0 0
9
0
0
0
0
Y
*
0
J
+
0
<
0 0
0
Z
K
[
L
\
M
>
0
1
/
?
y
j
z
k
{
m
}
N
t
n
0
+-
0
NOTE: All lower case alphabetic letters will be printed as upper case unless the "Lower Case Alphabetic Print" option
is incorporated
---I, PRINTABLE CHARACTER REF:
L - -_ _
_
USAS x 3.4·1967
PRINTER CONTROLCHARACTER
[j,~?/ ~/ ',~; IAUXI LlARY DEVICE CONTROL CHARACTER
_ I I CODES GENERATED BY KEYBOARD, BUT NO ACTION TAKEN
Figure 1-3. Code System and Character Set
1-7
[
I
1.........----18.25---~~
1-5.2 PHYSICAL.
a.
b.
c.
Terminal size
See figure 1-4
Terminal weight -
Width
Depth
Height
=
17.75 inches
18.25 inches
6.75 inches
c=:::::J
c=:::::J
c=:::::J
Models 720, 723, 730
38 pounds
Models 721, 722, 731
32 pounds
Power requirements -
[
c:==
=
==
==
120 VAC ±10%, 50/60
Hz, 240 watts maximum.
240 volt operation
optional, see Section II,.
INST ALLA TION.
17.75
c::::=::=l
c::::=::=l
(I
c:=::::J
c:::=:::::J
'-
(
-"
I
I
Figure 1-4. Outline Dimensions
(
('
I
I
(
I
I
1-8
SECTION II
INSTALLATION AND CHECKOUT
2-1 EQUIPMENT INSTALLATION
CAUTION
The Electronic Data Terminal is a self-contained unit
requiring no auxiliary equipment for usual data terminal
operation.
A visual inspection should be made of the
terminal before applying power. Check for
obvious shipping damage. Open the top cover
and remove the card cover from the card rack.
Check that no foreign objects are present.
Insure that all cards are tightly plugged into
their sockets and that all connectors to the
electronics assembly are secured. Replace the
card cover and close the top cover. Check that
all keys on the keyboard operate freely.
2-1.1 POWER CONNECTIONS. The normal power connection is 120 VAC, 50/60 Hz, 3 wire. To use the optional 240
VAC, ·50/60 Hz power changes must be made in the
terminal. Disconnect the yellow, brown and green leads
from their present location, (See Figure 2-1). Connect these
three leads to the center connector of the terminal block.
Remove the molded 120 volt plug from the power cord and
install a 240 volt, 15 amp rated tandem blade plug.
LEADS FROM
GREEN AND BROWN
TRANSFORMER LEADS
POWER CORD
BLACK & GREEN
LEADS FROM
TRANSFORMER
7
BROWN & WH ITE
LEADS FROM
TRANSFORMER
BLACK TRANSFORMER
POWER CORD
LEAD
FAN LEADS
(YELLOW)
240V OPERATION
120V OPERATION
Figure 2-1. 120V and 240V Operations
2-1
WHITE
TRANSFORMER
LEADS
[.
2-1.2 COMMUNICATION INTERFACE CONNECTION.
Connection is made at the rear of the terminal with an edge
connector (see Figure 2-2).
a.
b.
c.
lugs. The standard Model 730 is shipped with
the 60 rnA input current level. To set for
20 rnA, R2 on card assembly 244552-0002 or
-0001 (rearmost card in the card rack) must be
clipped out. On Model 731 to set for polar
operation, R2 and R1 must be clipped out on
244552-0001. For specific connections, see
Figures 2-3,2-4,2-5,2-6, and 2-7.
Data Set Cable (Part No.215563-1) is used to
connect a standard Model 720 or 721 to an
external data set. A standard RS232B
compatible 25-pin connector is provided at the
end of the 5-foot cable. For pin assignments,
see Table 1-1.
2-1.3 AUXILIARY
INPUT/OUTPUT
DEVICE
CONNECTION. Connection is made at the rear of the
terminal with an edge connector (see Figure 2-2). For pin
assignments, see Table 1-4.
phone Line Connection (Part No.215619-1) is
used to connect a Model 720 or 721 with the
built-in data set option to a phone line.
Connection consists of an edge connector for
connection to the terminal and a 5-foot cable
terminated with two spade lugs for connection
to the Bell System Direct Access Arrangement.
For pin assignments, see Table 1-1.
2-1.4 MODEL 722 CONNECTION. The parallel input
connection is made at the rear of the terminal, below the
red dot, with an edge connector (see Figure 2-2). For pin
assignments, see Table 1-3. A connector kit 21,5584-0001 is
provided for connection to the terminal.
Teletype Connection (Part No.215620-1) is
used to connect the Model 730 or 731 to the
communication line. Connection consists of an
edge connector for connection to the terminal
and a 5-foot cable terminated with four spade
2-1.5 MODEL 723 CONNECTION. The parallel input is
identical to that of the Model 722. The parallel output is
made at the rear of the terminal below the blue dot. See
Table 1-3 for pin assignments. Two connector kits
215584-0001 are provided for connection to the terminal.
r
(
I
(
('
[
I
[
[
1
[
I
Figure 2-2. Terminals Connections
2-2
[
, SPADE LUG
MODEL 30 TERMINAL
CABLE ASSY
r--------,
#215620:.0001
*
WHT
I
I
J13-6
I
I
TTY INTERFACE CARD
# 244555-0002
I
I
~~~~
CURRENT
SENSOR
.113-H
GRN
I
I
TELETY!~
TRANSMIT
LOOP
I
I
BLK
{
,RED
I
CURRENT
SWITCH
*
~----~------------~~~~-+---<
L
I
I
_ _ _ _ _ _ _ -1
Figure 2-3. TTY Neutral Interface Model 730, Full Duplex Wiring Diagram
(Yellow Dot)
*ARROW INDICATES POSITIVE CURRENT DIRECTION
A DOUBLE ARROW INDICATES POSITIVE CURRENT CAN BE EITHER DIRECTION
SPADE LUG
MODEL 30TERMINAL
CABLE ASSY
r --------,
# 215620:.0001
WHT
J13-6
*
I
I
TTY INTERFACE CARD
#244555-0002
I
+---+~I"'-I
J13-H
GRN
~--------~~~
TO
TTY
LOOP
J13-D
BLK
I
I
I
I
CURRENT
SENSOR
I
I
I
I
I
I
I
CURRENT
SWITCH
RED
I
I
I
I
L _ _ _ _ _ _ _ _ _ .J
Figure 2-4. TTY Neutral Interface Model 730, Half Duplex Wiring Diagram
(Yellow Dot)
2-3
[,
[,
MODEL 31 TERMINAL
*ARROW INDICATES POSITIVE CURREN-T DIRECTION
['
r------l
SPADE LUG
I
CABLE ASSY
# 215620-0001
WHT
TO
TTY
LOOP
3-6
I
/
1 ... 1
"
I
'
/
I
J1 3),
I
-H
GRN
BLK
NOT
USED
TTY INTERFACE CARD
#244555-0001
f
"
RED
[
~
.
:
,
I
......
IL
J1 3-2
I
CURRENT
SENSOR
I
..... 1
I
~
I
_ _ _ _ _ _ -1
(
/
"
Figure 2-5. TTY Neutral Interface Model 731, Receive only Wiring Diagram
(Yellow Dot)
**ARROW INDICATES DIRECTION MARK CURRENT
MODEL 30 TERMINAL
SPADE LUG
<
<
TTY RECEIVE LINE
••~----~--~~~~
.•
TTY COMMON
~--~~~------~
r-
s~~11
LINE
i
rTTY
-----,
INTERFACE CARD
CABLE ASSY
#215620-0001
**
WHT
J1 3-6
+-~-+---------~-+-<
/
".
J13-H
/
GRN
~~-~----------~~
---'1
"
J1 3-D
BLK
/
IJJ-4-<1
"
I
Il~ ~-+-_ _R_E_D_--+-
N
Mifr:tt::::'1
IcrRLI=I~II~31IE~.IIA~II~LlrnQI~lmrnn
.
~~ ~ ~
SHIFT
l2J L2J
.
rrul fSol fGSl Ill?ll
ll::J ~ L:.J
---- LJ lLJ
---- .
----
~ ~ ~
..
SPACE
l:i'~~~~:1
,
-~ _ _ _ _ _ _ _ ~
co
-
SHIFT
~--------~
]
DEPRESSING THE FOLLOWING KEYS WITH THE CONTROL KEY WILL GENERATE THE FOLLOWING CHARACTERS
NOT SHOWN ON THE KEYTOPS.
FS
RS
/ = US
, =
. =
Figure A-2. Model 720/730 Keyboard Arrangement
~~~~~~~~~~~~~~~~~~~
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