Lear Siegler ADM-3 User manual

ADM-3
DUMB
TERMINAL
MAINTENANCE
MANUAL


Section
TABLE OF CONTENTS
Page
1
2
3
GENERAL DESCRIPTION. . . . .
1.1 INTRODUCTION
...
1.2 ADM-3 CAPABILITIES . . . .
..
1.3 PHYSICAL DESCRIPTION. .
1.4 SPECIFICATIONS . . . . . .
INSTALLATION. .......
2.1 GENERAL
...
2.2 VISUAL INSPECTION
2.3 INSTALLATION. . .
2.4 SETTING INTERNAL SWITCHES. .
2.5 SETTING FRONT PANEL SWITCHES .......
2.6 SETTING DISPLAY CONTROLS . .
2.7 CONNECTING CABLES &TURNING
ON
POWER
OPERATION .
3.1 GENERAL . . . . . . . . . . . . . . . . . . .
3.2 DISPLAYABLE CHARACTERS. .....
3.3 SPECIAL FUNCTION KEYS .
3.4 PROGRAMMING AND WORD STRUCTURE
3.4.1 Remote Control
Functions.
.....
3.4.2 Data Character
Format
. .
3.4.3 Data Transmission
Format
. . . . . .
1-1
1-1
1-1
1-1
1-2
2-1
2-1
·
2-1
· . . . . .
2-1
.
2-1
·
2-3
·
2-4
2-4
· . . . . .
3-1
.......
3-1
3-1
3-1
·3-2
3-2
3-4
3-5
GENERAL .
GENERAL FUNCTIONAL DESCRIPTION
Display Generation ......
Display Refresh Operation ...
Monitor Video and Drive Circuits
Receiving and Storing
Data.
.
Cursor Generation . . .
Keyboard Logic . . . .
Data Transmitter Logic
Interface Control Logic
CRT Display Monitor
LOGIC DESCRIPTION .
General Clear Circuit
Display
Counters.
.
Offset Counter Logic
4THEORY OF OPERATION. ......
4.1
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.2.8
4.2.9
4.3
4.3.1
4.3.2
4.3.3
· . 4-1
· . 4-1
· . 4-1
· . 4-1
·4-1
·4-1
· . 4-1
· . 4-3
.4-3
..........
4-3
· . 4-4
.4-4
4-4
.........
4-4
4-4
4-6

TABLE OF CONTENTS (cont'd)
Section
Page
4THEORY OF OPERATION (cont'd)
4.3.4 Cursor Control Logic .........
4.3.5 Memory Address Logic .........
4.3.6 Refresh Memory and Character
ROM
Logic.
4.3.7 Erase
Logic.
. .
4.3.8 Write Pulse Logic. .
4.3.9 Keyboard Logic .
4.3.10 Beeper Logic . . . . . .
4.3.11 Data Receiver and Command Decoder Logic
4.3.12 Data Transmitter Logic .....
4.3.13 Video Blanking and Serializer Logic. .
4.3.14 Monitor Drive Logic.
..
....
4.3.15 Baud Rate Select
Logic.
. . . . . . .
4.3.16 Interface Control Logic . . . .
4.3.16.1 Code Turnaround Control
4.3.16.2 Reverse-Channel
Control.
. .
4.3.17 Power Supplies. .
..
.
4.3.18 CRT Display Monitor .
4.3.19 Answerback O.ption. ...
4.3.20 Extension Current Loop .
4.3.21 Extended Numeric Keypad . . . . . .
4-7
4-7
·
..
4-11
· .
..
4-13
·
.....
4-13
. . .
.. ..
4-13
4-15
4-16
.
....
4-16
4-18
·4-19
·
.....
4-19
· . 4-20
·
..
4-20
· . 4-20
·
..
4-21
. . . . . . 4-21
· .
..
4-25
.
...
4-25
·4-25
5-1
· .
5-1
.......
5-1
·
5-1
· .
5-1
· . .
5-1
·
5-1
· .
5-1
·
5-1
·
5-3
5-3
5-3
5-3
· . 5-3
...
5-3
....
5-4
5-4
· . 5-8
· . 5-8
· . 5-8
MAINTENANCE. . . . . . .
5.1 GENERAL ........
5.2 INSTALLATION. .
5.3 ROUTINE MAINTENANCE
5.4 OPENING
ADM-3
COVER.
.
5.5 ADJUSTMENTS. '
.....
5.5.1 Contrast Adjustment . .
5.5.2 Brightness Adjustment. .
5.5.3 Low Voltage Supply. .
5.5.4 Vertical Adjustments .
5.5.5 Horizontal Adjustments .....
5.5.6 Focus Adjustment . . .
5.5.7 Centering. . . . . . . . . . . .
5.6 CORRECTIVE MAINTENANCE. .
5.6.1 Failure Analysis ..........
5.6.2 Troubleshooting the Monitor . . . .
5.6.3 Removing and Replacing Monitor CRT and Subassemblies. .
5.6.4 Troubleshooting the Main Circuit
Board.
. . . .
5.6.5 Removing and Replacing the Main Circuit Board. .
5.6.6 Removing and Replacing Key Switch Contacts
5
ii

TABLE OF CONTENTS (cont'd)
Section Page
6-1
·6-1
6-1
6-7
6-7
6-7
...
6-8
·6-8
· . 6-11
· . 6-16
6-16
.
....
6-16
· . 6-16
6-16
· . 6-19
.......
6-19
......
..
6-19
....
6-19
·6-19
·6-21
.
.....
6-25
·6-25
......
6-25
·6-26
·6-28
. . .
..
6-31
··.··6-34
· · 6-35
· · · 6-36
· · 6-37
DRAWINGS, ,......................
6.1 SCHEMATIC SHEET
#2
-System Counters . .
6.2 SCHEMATIC SHEET #11 -Interface
Control.
.
6.3 SCHEMATIC SHEET
#3..
. .
6.3.1 Offset Counter.
6.3.2 Cursor Registor . . .
6.3.3 Beeper
Circuit.
.............
6.4 SCHEMATIC SHEET #4 -Memory Address Generation. .
6.5 SCHEMATIC SHEET
#5
-Data
Receiver/Decoder..
.....
6.6 SCHEMATIC SHEET
#6.
. . . . " . . . . .
6.6.1 Clear Circuit. . . . .
6.6.2 Read Back . . . . . . . . .
6.6.3 Monitor Drive Signals .
6.6.4 Cursor Generation . .
6.7 SCHEMATIC SHEET
#7
...
6.7.1 Refresh
Memory.
.
6.7.2 Character Generators
6.7.3 Video Serializer . . .
6.7.4 Transmit Data Multiplexers.
6.8 SCHEMATIC
#8
-Keyboard Circuit
6.9 SCHEMATIC SHEET
#9
. . .
6.9.1 Data
Transmitter.
.....
6.9.2 Control Section of UART. .
6.9.3 Current Loop SMTR/RCVR ......
'.
.
6.10 SCHEMATIC SHEET
#10
-Baud Rate Generation. .
6.11 CRT DISPLAY MONITOR .
6.12 P.C. BOARD ASSEMBLY .
6.13 CIRCUIT BOARD
FRONT.
. .
6.14 CIRCUIT BOARD BACK
....
6.15 POWER SUPPLY SCHEMATIC
6
7PARTS LIST .
7-1
8RETURNING EQUIPMENT
FOR
REPAIR. · ·
8-1
9PAINT
.....
9-1
APPENDIXA
..
·A-I
APPENDIXB .· ·
B-1
iii

LIST OF ILLUSTRATIONS
Figure Page
2-1
2-3
2-4
.....
4-2
4-3
4-4
.....
4-5
.....
4-6
·4-8
...
4-9
·4-9
·4-10
4-11
4-12
4-14
4-16
·4-17
4-18
4-19
·4-21
..
4-22
ADM-3 Internal Switches and Controls
ADM-3
Front
Panel Switches .....
Background Intensity ·Control. . . . . . . .
ADM-3 Interactive Display Terminal, Functional Block Diagram. . .
CRT Display Matrix. . . . . . . . . . .
Display Counters, Block Diagram. . .
Display Counter Timing . . . . . .
Offset Counter Logic, Block Diagram .
·Clear Screen Timing. . . . . . .
Cursor Control Logic, Block Diagram
Memory Address Logic, Block Diagram .
Manipulation
of
Display Address. . . .
Organization
of
Display Data in Refresh Memory. .
Refresh Memory and Character ROM Logic, Block Diagram
Keyboard Logic Timing ..............
Data Receiver and Command Decoder Logic, Block Diagram
Data
Transmitter Logic, Block Diagram ......
Video Blanking and Serializer Logic, Block Diagram
Baud Rate Select Logic, Block Diagram . . . . .
Interface Timing for Code Turnaround . . . . .
Interface Timing for Reverse-Channel
Operation.
.
2-1
2-2
2-3
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
Interface Connector Terminal Assignments. .
Inputs
to
Monitor, Timing Diagram. . .
Monitor Voltage Waveforms. ........
Monitor Video Board,
Component
Layout.
.....
Removing and Replacing Key Switch Contacts, Step d
Removing and Replacing Key Switch Contacts, Step g
Removing and Replacing Key Switch Contacts,
Step
h-1.
Removing and Replacing Key Switch Contacts, Step
h-2.
. .
Removing and Replacing Key Switch Contacts, Step i .
Removing and Replacing Key Switch Contacts, Step
I.
.....
·
5-2
·
5-5
5-6
.....
5-7
·5-11
...
5-12
·5-13
· . 5-14
· . 5-15
.......
5-16
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
Display Counter Timing . . . . . .
Basic
Counters.
. . . . . . . . . .
Interface Timing for Code Turnaround
Interface Timing for Reverse-Channel
Operation.
Interface
Control.
.
Clear Screen Timing. . . . . . . . . . . . .
Offset Line
Counter.
. . . . . . . . . . . .
Manipulation
of
Display Data in Refresh Memory' .
6-2
·
6-3
· . 6-4
6-5
·
6-6
·
6-9
·6-10
·6-13
iv

Figure
6-9
6-10
6-11
6-12
6-13
6-14
6-15
6-16'
6-17
6-18
6-19
6-20
6-21
6-22
6-23
6-24
6-25
LIST OF ILLUSTRATIONS (cont'd)
Organization of Display Data in Refresh Memory. .
MUX
.....
Operation Initiate.
Read Mode
....
Cursor Generation . . . .
Memory Refresh, Video
Keyboard Logic TIming .
Keyboard
..
Current Loop . . . . .
Baud Rate
.....
Monitor Interconnecting Cabling Diagram
Monitor Circuit Board Components Location .
Schematic, TV9 and
12
With Power Supply.
P.C. Board Assembly
Circuit Board
Front.
Circuit Board Back .
Power Supply . . . .
v
Page
6-13
· . 6-15
6-17
· . 6-18
.
...
6-20
. .
..
6-23
·6-24
6-27
·6-29
·6-30
6-31
......
6-32
·6-33
6-34
6-35
· . 6-36
· . 6-37

Table
1-1
1-2
3-1
3-2
5-1
LIST
OF
TABLES
Monitor
Input
Data
Specifications .
CRT Display Specifications.
ADM-3 Control
Codes.
.
ASCII Character Codes
Main Circuit Board Connector Terminals.
vi
Page
1-3
1-4
3-3
.
3-4
5-19

1.1
INTRODUCTION
SECTION 1
GENERAL DESCRIPTION
1.3 PHYSICAL DESCRIPTION
This
manual
contains
a
general
description,
installation
and
operating
instructions,
theory
of
operation,
and
maintenance
information
for
the
Lear
Siegler
ADM-3
Interactive
Display
Terminal.
Additional
information
is
contained
in
the
ADM-3
Operator's
Handbook.
The
mainte-
nance
technician
should be
thoroughly
famil-
iar
with
material
in
the
Operator's
Handbook
before
attempting
to
troubleshoot
or
repair
the
ADM-3.
1.2 ADM-3 CAPABILITIES
The
ADM-3
has
the
following
general
capabilities:
a. Receives USASCII-coded
data
from are-
mote
computer
and
displays
it
on
aCRT
screen
displaying
up
to 960
characters
(1920
characters,
optional).
b.
Permits
the
operator,
using
a,keyboard,
to compose amessage, visible on
the
screen
as
it
is
transmitted
to
the
remote
computer
or
other
device.
c.
Through
an
extension
port,
permits
inter-
facing
with
ahard-copy
printer,
magnetic
tape
recorder,
or
other
terminals.
d.
Provides
for
full-duplex
or
half-
duplex
communications,
through
either
an
RS -232C
or
current-loop interface.
e.
Permits
202
communications
line
turnaround
by
means
of
either
EOT
or
ETX
code-turnaround
(in which
the
con-
trolling
device
transmits
a
turnaround
code to give control to
the
device
at
the
other
end
of
the
line),
or
secondary-
channel
turnaround(in
which asecondary
channel
selection
establishes
control
of
a
device for
data
transmission
through
the
primary
channel).
1-1
Principal
components
of
the
ADM-3
are
as
fol-
lows:
a. Amolded case comprising a
base
and
a
cover.
The
base
contains
the
power
switch,
power
transformer,
beeper
speaker,
and
inter
component
cabling.
The
main
circuit
board
rests
on
supports
molded
in
the
base
and
is
held
in
place
by
two guide pins.
The
cover
contains
the
monitor
CRT
and
other
monitor
subassemblies.
It
is
hinged
at
the
rear
so
that
all
components
of
the
ADM-3
are
accessible
when
it
is opened.
The
cover
is
easily
removed
by
swinging
it
back
as
far
as
it
will go,
and
then' slid-
ing
it
to
the
left, off
the
hinge
pins. (The
monitor-connecting cable
must
be
discon-
nected.)
b.
The
main
circuit
board
which
contains
all
elements
of
the
ADM-3 except monitor,
power
switch
and
transformer,
and
beeper
speaker.
The
keyboard
consists
of
integrated
key
rows
and
is
built
directly
on
the
main
circuit
board.
The
main
circuit
board
rests
on
supports
within
the
base
and
is
held
in
place
by
guide
pins. Two connectors
on
the
rear
edge
of
the
board
provide
the
RS-232C
and
current
loop (optional
printer
port)
interface
at
both
the
main.
and
extension
ports.
c.
The
CRT
monitor
which
comprises
three
subassemblies,
as
follows:
1.
The
CRT itself.
The
CRT
is
mounted
in
a
metal
frame
with
its
face
held
against
the
cover bezel
by
two
brackets,
each
retained
by
asingle screw.

KEYBOARD
59-key solid-state
keyboard
designed
similar
to a
teletypewriter
layout
and
containing
the
following keys:
2.
A
printed
circuit
board
(video board)
containing
most
circuits
of
the
monitor.
The
video
board
is
held
in
place
by
the
cover molding
on
one side,
and
by
pressure
of
the
flyback assem-
bly
on
the
other.
3.
The
flyback assembly,
which
is
held
in
place
by
asingle screw. Bosses
in
the
cover molding assembly surface
retain
the
edge
of
the
video board.
1.4 SPECIFICATIONS
47
alphanumeric
keys
RETURN
LINE
FEED
RUB
HERE
IS
SHIFT
COMMUNICATIONS
CTRL (Control)
BREAK
CLEAR
REPT
(Repeat)
ESC (Escape)
Space
Bar
DISPLAY
Screen
12-inch
(diagonally
measured)
rectangular
CRT
with
P4
white
phosphor
and
etched non-
glare
surface.
Display Format
Standard:
960
characters,
12
lines
of
80
characters
Optional:
1920
characters,
24
lines
of
80
characters
Character Set
Generated:
128 ASCII
characters
(upper
and
lower case,
numeric,
punctuation
and
control)
Displayed:
Standard
-64 ASCII
characters
(upper
case,
numeric,
punctuation)
Optional-
95 ASCII
characters
(upper
and
lower
case,
numeric,
punc-
tuation)
Character Generation
5 x 7 dot
matrix,
0.18 in.
high
x0.075
in.
wide
Cursor
Underline,
homes to lower left
of
screen
Data Entry
New
data
enters
on
bottom
line
of
screen;
line
feed causes
upward
scrolling
of
entire
display
page
with
top-of-page overflow.
Refresh Rate
.60Hz
or
50Hz,
dependent
on
an
internal
switch
set
to
match
power
line
frequency.
1-2
Modem Interface
EIA
standard
RS-232C
and
20mA
current
loop
(switch selectable)
Extension Interface
Extension
RS-232C
port
for
interfacing
serial
asynchronous
auxiliary
device (e.g.,
hard
copy
printer,
magnetic
tape
recorder
or
additional
data
terminals).
Optionally,
the
extension
port
is
available
with
both
RS-232C
and
20mA
current
loop in-
terfaces.
Communication Rates
75,110,150,300,600,1200,1800,2400,4800,
9600, 19200
baud
(switch selectable)
Send/Receive Modes
Full
duplex
and
half
duplex
(switch selectable)
Word Structure
Total
word
length
is switch selectable to 9, 10
or
11
bits
consisting
of
the
following:
7-bit
data
word 1
start
bit
\
8th
bit
-
parity,
odd
or
even
1
or
2stop
bittj
OR
forced to 1
or
0
OR
8th
bit
suppressed
PHYSICAL AND ELECTRICAL
Dimensions
13.5
in.
high
x15.5 in. wide x19 in. deep

Weight
25 pounds
Power
Consumption
80
watts
@115 Vac ±
10%
MONITOR ELECTRICAL SPECIFICATIONS
50Hz
or
60Hz,
switch
selectable
Optional 230Vac
Operating
Environment
5 - 55°C (41 -122°F), 5 -
95%
relative
humidity
without
condensation.
TABLE
1·1. MONITOR INPUT DATA SPECIFICATIONS
Vertical Drive Horizontal Drive
Video Signal Signal
Input (Necessary Accessory -Available)
Connector Printed circuit board card edge connector -Viking No. 2VK10S/1-2
or
Amphenol No. 225-21031-101
Pulse Rate or Width Pulse Width: Pulse Rate: Pulse Rate: 15,000
100 nsec min. 47 to 63 pulses/sec to 16,500 pulses/sec
Amplitude Low =Zero
~g:6
volts
High =4±1.5 volts
Signal Rise and Fall Times Less than 20 nsec Less than 100 nsec Less than 50 nsec
(10%to
90%
amplitude
DATA DISPLAY SPECIFICATIONS
Input
Impedance
(a) Video Input:
(b)
Vertical Drive Input:
(c)
Horizontal Drive Input:
Video
Amplifier
Minimum
Shunt
Resistance
3.3 Kohms
3.3 kohms
470 ohms
Maximum
Shunt
Capacitance
40
pF
40
pF
40
pF
(a) Bandwidth:
(b)
Rise
and
Fall
Times
(10%
to
90%
amplitude):
(c)
Storage
Time:
Retrace and Delay Times
-(a) Vertical:
(b)
Horizontal:
1-3
12 MHz
(-3
dB)
Less
than
35 nsec
(linear
mode)
315 nsec,
maximum
(linear
mode)
900 sec retrace,
maximum
7sec
retrace
plus
4sec delay,
maximum

TABLE 1-2. CRT DISPLAY SPECIFICATIONS
Nominal Diagonal *Resolution (TV Lines)
Measurement
(inches) Phosphor Center Corner
12 P4 900 at 40 fL 800 at 40 fL
*Resolution is measured
in
accordance with EIA RS-375 except Burst Modulation (or (Depth of Modulation) is adjusted
for 100 percent.
Geometric Distortion
The
perimeter
of afull field
of
characters
shall
approach
an
ideal
rectangle
to
within
±
1.5%
of
the
rectangle height.
Power Requirements
Input
Connector
Input
Voltage
Input
Power
Output
Voltages
ENVIRON'MENTAL SPECIFICATIONS
Temperature (Chassis
or
Custom Unit)
Operating
Range:
Storage Range:
Humidity
5to 95
percent
(Noncondensing)
Altitude
Operating
Range:
HUMAN FACTORS SPECIFICATIONS
X-Ray Radiation
Receptable,
Molex No. 03-06-1041
Supplied
with
Unit
Mating
Plug,
Molex No. 03-06-2041
-Necessry Accessory (Available)
105 Vto 130 V
rms
(120 Vnominal); 50/60 Hz
24W(Nominal)
+15 VDC
(short
circuit protected)
+12
kV
DC; 12.6 V
rms
Up
to 10,000 feet
These
units
comply
with
DHEW Rules-42-CFR-Part 78
1-4

SECTION
,2
INST
ALLATION
This
section
contains
information
to
aid
in
installing
the
ADM-3
and
preparing
it
for use.
Included
are
instructions
and
information for
inspecting
the
ADM-3,
installing
it
in
a
suitable
environment,
setting
internal
switches, con-
necting
cab.les,
and
turning-on
power.
2.2 VISUAL INSPECTION
It
is recommended
that
you save
the
orginal
shipping
carton
and
all
packing
materials
to
prevent
damage
shouldyou
wish
to
transport
or
ship
the
terminal.
Carefully
inspect
your
ADM-3 for
signs
of
damage
during
shipping.
The
terminal
has
undergone
stringent
quality
inspections
and
operational
tests
prior
to shipping;
it
left
the
factory
in
perfect
operating
condition.
If
the
unit
is
damaged,
notify
the
carrier
immediately. Save
the
damaged
shipping
con-
tainer
as
evidence for inspection by
the
carrier.
Only
the
consignee
may
register
aclaim
with
the
carrier
for
damage
during
shipment. How-
ever,
Lear
Siegler
Data
Products
will cooperate
fully
with
the
customer
should
such
action be
necessary.
2.3 INSTALLATION
The
ADM-3
is
designed to
operate
in
awide
range
of
environmental
conditions:
5 -55°C (41-122°F), 5 -
950/0
relative
humidity
without
condensation.
INTERNAL
SWITCHES
The
unit
isdesigned to
set
on
a
table
or
desk
top,
or
any
other
suitable
hard,
flat
surface.
CAUTION
In
cold climates,
care
should be exer-
cised to allow
the
temperature
of
the
terminal
to equalize
with
room tem-
perature
before
removing
the
unit
from
the
shipping
carton;
this
will
prevent
moisture
from condensing on
acold
terminal
exposed to
warm
air.
Avoid
operating
the
unit
on
asoft
surface,
such
as
carpeting,
which
would
obstruct
the
flow
of
cooling
air
up
through
the
bottom
of
the
chassis.
This
could
result
in
over-
heating
and
damage
to
the
unit.
2.4 SETTING INTERNAL SWITCHES
Twelve slide switches located inside
the
ADM-3
case
on
the
printed
circuit logic
board
are
used
to select various
terminal
operating
character-
istics.
These
switches
are
set
at
the
factory
during
pre-shipping
checkout
according
to
operating
parameters
specified
by
the
customer
when
ordering
the
terminal.
Only
the
param-
eters
listed
on
the
Ordering
Form
packed inside
the
shipping
carton
have
been
selected
at
the
factory.
Any
required
switch
setting
changes
shouldbe
made
before
attempting
to
operate
the
terminal.
Locations
of
the
internal
switches
are
shown
in
Figure
2-1.
FRONT PANEL
Figure
2-1.
ADM-3 Internal Switches and Controls
2-1

WARNING
Always disconnect
the
ac power cord
from
the
power source before opening
the
ADM-3 case to access
any
internal
component.
Switch functions
are
described below:
SPACE-ADV
In
SPACE position, selects destructive cursor.
Pressing
the
space
bar
or
receiving aspace code
ALWAYS
overwrites
the
display
memory
location
with
aspace code
and
advances
the
cursor.
In
ADV position, selects non-destructive cursor
between a
Return
and
subsequent
Line Feed
only;
the
cursor
may
be advanced
but
aspace
code does
not
overwrite display memory loca-
tions. The space code is destructive between a
Line Feed
and
the
next
Return.
UC DISP -
U/L
DISP
In
UC DISP position, allows display of
upper
case
characters
only.
Lower
case
codes
are
transmitted
as
such
but
are
converted to
upper
case for display.
If
lower case
is
not
installed
or
if
it
is
not
to be utilized,
the
switch
must
stay
in
the
UC DISP position.
In
U/L DISP position, allows display
of
upper
and
lower case
characters
if
the
terminal
is
equipped
with
the
Upper/Lower Case option.
DISABLE -
KB
LOCK
In
DISABLE
position,
prevents
locking
of
keyboard.
In
KB LOCK position, allows keyboard to be
electricafiydisabled (locked)
by
remote control
codes.
DISABLE -CLEAR SCREEN
In
DISABLE position,
prevents
clearing
of
dis-
played information except by executing repeti-
tive
line
feeds.
In
CLEAR SCREEN position, allows computer
to
clear
ADM-3 screen
by
transmitting
acontrol
code (CTRL
Z).
50Hz -60 Hz
Selects 50Hz
or
60Hz display refresh
rate;
must
be
set
to correspond
with
input
power frequency.
12
LINE -
24
LINE
If
terminal
is equipped
with
24-line display
option,
this
switch
may
be used to select 12
or
24 line display.
On
terminals
with
standard
12 line display
this
switch
must
be
set
to
the
12 LINE position.
LOCAL-
OFF
103 -OFF
202-
OFF
These
three
switches
are
used to select ADM-3
operation for one
of
the
following methods of
interfacing to
the
computer:
(1)
without
mod-
ems (direct, local connection),
(2)
with
103-type
modems,
or
(3)
with
202-type modems. The ap-
propriate
switch is
set
(left position) according
to
the
connection
method
used;
the
other
two
switches
must
be
set
to
the
OFF
positions.
Setting
the
LOCAL
switch
causes
line
CA
(Request to Send) to rise
and
fall
with
each
character
transmitted.
Setting
the
103 switch holds CA high,
if
re-
quired.
Setting
the
202 switch
enables
202-type opera-
tion
using
the
secondary
channel
or
turnaround
code to change
the
direction
of
data
over
the
primary
data
channel
(half-duplex operation).
With
all
three
switches off, CA is held low all
the
time.
CODE -SEC CHAN
This
switch is active only
with
the
202 switch
(described above)
in
the
on position.
It
is used to
select
the
method
of
line
turnaround
for half-
duplex operation
with
202-type modems.
In
SEC
CHAN
position,
enables
line
turn-
around
using
the
secondary channel. 202 mo-
dem
operation is
summarized
in
the
back
of
this
handbook.
The
CODE
position
allows
line
turnaround
control by a
turnaround
code
transmitted
over
the
primary
data
channel. The
turnaround
code
may
be
either
ETX
or
EOT,
as
selected by
the
switches described below.
EXT-
OFF
EOT-
OFF
2-2

One
of
these
two switches is
set
to
the
on
(left)
position to select
the
line
turnaround
code for
primary
chanel
operation
with
202-type modems.
(See CODE -SEC CHAN switch description.)
With
202
and
CODE selected,
one
of
these
switches
must
be on
and
the
other
off;
with
202
and
SEC
CHAN
selected,
or
202 off,
both
the
ETX
and
EOT
switches
must
be
set
to
the
OFF
positions.
In
BIT 8-0 position,
bit
8
is
forced to azero value.
In
the
1position,
bit
8
is
forced to aone value.
PARITY-INH
In
PARITY
position,
the
bi
t
following
the
7 -
or
8 -
bit
data
word is a
parity
bit
(parity
en8:
bled
).
2.5 SETTING FRONT
PANEL
SWITCHES
Twenty
slide switches for selecting
the
primary
terminal
operating
characteristics
are
accessi-
ble from
the
ADM-3 front
panel
without
open-
ing
the
case
or
removing power to
the
unit.
To
gain
access to
these
switches, remove
the
screw
securing
the
identification
plate
on
the
left side
of
the
keyboard
and
remove
the
ID plate.
The
switches
are
shown
in
Figure
2-2.
In
INH
position, no
parity
bit
will be
generated
(parity
inhibited).
The
bit
following
the
data
word will be
the
(first) stop bit.
STOP
-1
- 2
In
STOP-l
position,
one
stop
bit
is
generated.
In
the
2position, two stop
bits
are
generated.
In
the
8position,
8-bit
data
word
length
is
selected. (The 8-bit word consists
of
the
stand-
ard
7-bit
dat~
word
plus
an
8th
bit
forced to one
or
zero
according
to
the
setting
of
the
BIT
8-0 -1switch.)
PARITY-ODD -
EVEN
This
switch
has
effect only
with
the
PARITY -
INH
switch
in
the
PARITY position.
In
PARITY-ODD position, selects odd
parity.
DATA
-7-
8
In
DATA-7 position, 7-bit
data
word
length
is
selected.
In
EVEN
position, selects
even
parity.
CONTRAST
CONTROL
81
T
8-0
1
PARITV-
INH
S
TOP
- I -
~.,.,...
. "
..
'
..
""
2
OATA-l
6
PAR-ODD
EVEN
l C fH
UC
AUTO
Hl
Off
RS
232
Cl
MOl
FOX
19200
9600
4800
:
2400
Figure 2-2. ADM-3
Front
Panel Switches
It
is recommended
that
you check
the
positions
of
these
switches before
operating
the
terminal
for
the
first
time. Switch functions
are
described
below:
BIT
8-0-1
.
This
switch
has
effect only
with
the
DATA-7
- 8 switch
in
the
8position.
LC
EN
-
UC
In
LC
EN
position,
the
SHIFf
key
is fully oper-
ational
allowing
generation
of
both
upper
and
lower case
alphabetic
character
codes.
In
UC position,
only
upper
case
allphabetic
characters
will
be
generated
regardless
whether
of
not
the
SHIFT
key
is
held
down.
The
SHIFT
key
remains
operational
for
all
non-
alphabetic
keys.
AUTO NL
-"OFF
In
AUTO NL position,
typing
in
the
80th
char-
acter
position
will
automatically
cause
the
cursor
to move to
the
first
position
of
the
bottom
line
and
the
display to scroll
upward
one line.
The
operator
continues
typing
on
the
next
new
line.
2-3

In
OFF
position,
the
automatic
New
Line
func-
tion
is disabled.
Continued
typing
at
the
80th
character
position
transmits
each
new
char-
acter
and
changes
the
80th
character
on
the
display.
RS232-
CL
In
RS-232, position, selects RS-232C communi-
cations
at
the
MODEM (computer)
interface
connector
on
the
rear
panel.
In
CL
position,
selects
20mA
current
loop
communications
at
the
MODEM
interface
connector.
HOX-
FOX
In
HDXposition,
selects
half
duplex operation.
Characters
typed
are
transmitted
and
auto-
matically
echoed
back
from
the
ADM-3 I/O
Channel
for display.
In
FDX position, selects full duplex operation.
Characters
typed
are
displayed only
if
echoed
back
by
the
computer
or
modem.
Communication Rate Switches
19200
9600 BThese switches are used to select
4800 Athe
send/receive
rate
for
data
2400 U
communications
with the com-
1800 Dputer and auxiliary device.
1200
600 RSetting one switch to the left-
300 Ahand (BAUD RATE) position
150 T' selects the associated rate.
110 E
75
NOTE
Only one BAUD RATE switch
may
be
selected (left position)
at
atime.
2.6 SETTING DISPLAY CONTROLS
Contrast
The
Contrast
control is located to
the
right
of
the
keyboard on
the
ADM-3 front panel.
It
is
used
by
the
opertor
to
adjust
brightness
of
the
characters
for
optimum
readability.
The
Con-
trast
knob
is
turned
clockwise
to
increase
character
brightness,
counterclockwise to de-
crease
brightness.
Background Intensity
A
Background
Intensity
potentiometer
is
located inside
the
ADM-3 case
on
the
circuit
2-4
board
in
the
top
of
the
case. (See
Figure
2-1.)
Background
intensity
is
adjusted
at
the
factory
before
the
terminal
is shipped
and
should
not
require
re-adjustment
prior
to
using
the
terminal.
Figure 2-3. Background Intensity Control
(located in top of case)
WARNING
Because
the
Background
Intensity
control
must
be
adjusted
with
the
ADM-3 case open
with
power on,
it
should be
adjusted
only
by
qualified
service personnel.
ON/OFF Switch
The
power
ON/OFF
switch
is located
on
the
ADM-3
rear
panel.
2.7 CONNECTING CABLES AND TURNING
ON
POWER
a.
With
the
ON/OFF
switch
in
the
OFF
posi-
tion,
plug
the
ADM-3 power cord
into
the
proper
AC power
outlet.
b.
Connect
the
interface
cable
from
the
computer
or
modem to
the
MODEM
inter-
face connector
on
the
ADM-3
rear
panel.
c.
Connect
the
inteface
cable
from
the
auxiliary
device
(ifpresent
in
your
system)
to
the
EXTENSION
interface
connector
on
the
ADM-3
rear
panel.
d.
Check
the
settings
of
all
front
panel
switches to verify
that
the
terminal
is
set
up
for
proper
operation
in
your
system.
Make
switch
setting
changes
if
necessary.

e.
Set
the
ON/OFF power switch to
the
ON
position.
f.
Allow approximately 20 seconds for
the
unit
to
warm
up. The
cursor
should
appear
near
the
bottom
of
the
screen.
If
the
cursor does
not
appear,
adjust
the
Contrast
control on
the
front
panel
for
proper intensity.
2-5
NOTE
If
the
Full-Duplex mode is selected,
typing
at
the
keyboard will
not
display
characters
unless
echo-back
is
pro-
vided
by
the
computer
or
modem.
If
half-duplex is selected,
data
will be
displayed
only
if
clear-to-send
is
present
or
cable
is
disconnected.


This
section
contains
information
and
instruc-
tions
for
using
the
ADM-3 keyboard facilities,
and
for
programming
control functions
at
the
computer.
The
keyboard allows
the
operator
to
generate
and
transmit
to
the
computer
(and/or
auxiliary
device)
all
128 USASCII
character
codes.
3.1
GENERAL
SECTION 3
OPERATION
If
the
front
panel
SPACE-ADV switch is
in
the
ADV position,
the
space code is non-destructive
after
typing
the
RETURN
key;
that
is,
the
operator
or
computer
can
space over
data
on
the
line'
withou~
overwriting
each
character
with
aspace.
The
space
bar
remains
non-destructive
following a
RETURN
function
until
a
LINE
FEED
code
is
generated.
3.2 DISPLAYING CHARACTERS
In
the
standard
ADM-3,
64
characters
are
displayed on
the
screen
(upper
case
alphabet,
numbers
and
most
symbols
and
punctuation).
When
anon-displayable lower case
character
is
typed,
the
proper
lower case code is
transmitted
but
the
character
is displayed
as
upper
case.
If
your
terminal
contains
the
Upper/Lower
Case
Display feature, 95
characters
will be displayed
(upper
and
lower case
alphabet,
numbers
and
all
punctuation
and
symbols).
NOTE
Typing
at
the
keyboard
always
generates
codes
which
are
trans-
mitted;
however,
in
order
for
char-
acters
to be
displayed
and
·control
codes to affect
the
ADM-3 display·
the
codes
must
be
echoed
back
to
the
ADM-3
display
memory
and
control
logic,
either
by
the
computer
(FDX)
or
the
ADM-3 I/O
Channel
(HDX).
All display actions described
in
the
key
descriptions
that
follow
assume
the
generated
codes
are
echoed.
3.3 SPECIAL FUNCTION KEYS
In
addition to
the
displayable
character
keys,
the
ADM-3
keyboard
contains
a
number
of
other
keys
for
various
terminal
and
system
control
functions. Use
of
these
keys is described below:
RETURN Key
The
code
generated
by
this
key
moves
the
~ursor
to
the
first
character
position
of
the
bottom line.
3-1
LINE FEED Key
The
code
generated
by
this
key
causes
the
entire
display
to move
upward
one line,
leaving
the
cursor
positioned
on
the
next
new
(bottom) line.
LINE
FEED
does
not
return
the
cursor
to
the
first
character
position
of
the
new
line.
SHIFT Keys
Either
of
the
two
SHIFT
keys· is
held
down
while
typing
another
key
to
generate
upper
case
alphabetic
characters
or
to
generate
the
char-
acter
shown
in
the
upper
portion
of
a
typed
key.
NOTE
Setting
the
~~LC
EN
-
UC"
switch
under
the
front
panel
ID
plate
to
the
UC position
causes
upper
case
alpha-
betic
characters
to be
generated
with
or
without
the
SHIFT
key
depressed.
The
SHIF1'
key
remains
operational
for
all
non-alphabetic keys.
RUB (Rubout) Key
This
key
(typed while holding down
the
SHIFT
key)
transmits
anon-displayable
Rubout
code
(ASCII DEL) to
the
computer.
The
cursor
is
not
advanced
and
the
character
code stored
in
the
ADM-3 display
memory
is
not
overwritten.
The
Rubout
function is
normally
used
to
tell
the
computer
that
aprevious
character
should
be
deleted.
The
lower case RUB
key
transmits/displays
an
underline.
REPT (Repeat) Key
This
key
can
be
held
down while
pressing
a
character
key
to
repeat
the
character
at
a
rate
of
12.5
per
second. (If
the
terminal
is
operating
at
a
baud
rate
that
will
not
permit
12.5 cps
transmission,
the
repeat
rate
is reduced to
the
transmission
rate.)

Space Bar
The
Space
Bar
is
considered
a
displayable
character
key.
Pressing
the
Space
Bar
causes
the
ASCII code
for aspace to be
transmitted
and
stored
in
the
ADM-3
display
memory
and
a
blank
space to
appear
on
the
screen.
(For
the
only exceptions
see
RETURN
Key).
CTRL (Control) Key
This
key,
when
held
down
while
typing
another
key, modifies
the
code
pattern
of
the
typed key.
The
code is forced to one
of
the
two
control code columns
in
the
ASCII Code
chart.
Of
the
32
control code combinations possible
from
the
keyboard, four
may
be used to effect
actions
within
the
ADM-3:
Backspace (CTRL/H).
Each
time
the
H
key
is
typed
while holding down
the
CTRL key,
the
cursor
moves non-destructively one
character
position to
the
left.
The
CTRL/H backspace code
is
transmitted
to
the
computer. CTRL/H
may
be
used
in
conjunction
with
the
Repeat
key.
Bell (CTRL/G). Sounds
the
audible
beep
in
the
ADM-3
and
transmits
the
CTRL/G bell code.
Return (CTRL/M). Duplicates
the
function
of
the
RETURN key.
Line Feed (CTRL/J).
Duplicates
the
function
of
the
LINE
FEED
key.
Lock
Keyboard
(CTRL/O).
Electrically
locks
(disables)
the
ADM-3 keyboard,
preventing
any
further
keyboard activities.
The
keyboard
can
only be unlocked
by
acontrol code from
the
computer,
or
by
switching
powerto
the
terminal
off,
then
on
again.
ESC
(Escape) Key
This
key
transmits
to
the
computer
an
ASCII
Escape code,
the
function
of
which
is
entirely
dependent
on
the
computer.
CLEAR Key
Typing
the
CLEAR
key
while holdingdown
the
SHIFT
key
clears
the
entire
screen
to spaces.
(This function
may
be disabled
by
the
internal
CLEAR
SCREEN
-DISABLE Switch.)
HERE IS Key
If
your
terminal
is equipped
with
the
Automatic
Answer
Back
feature,
typing
this
key
transmits
3-2
aidentification
message
(stored
in
the
ADM-3
in
aspecial memory) to identify
your
terminal
and
alert
the
computer
that
amessage is to
follow.
In
terminals
without
Automatic
Answer
Back
capability,
this
key
has
no function.
BREAK Key
This
key
activates
the
standard
teletypewriter
Break
function,
normally
used
to
interrupt
an
incoming message.
NOTE
The
Break
function
is
sustained
as
long
as
the
BREAK
key
is
held
down.
Holding
the
key
down for
an
extended
period
may
cause
the
computer
to
disconnect from
your
terminal.
3.4 PROGRAMMING AND WORD STRUCTURE
The
computer
to
which
the
ADM-3
is
interfaced
has
full control over
the
terminal.
All control
functions
which
are
possible from
the
ADM-3
keyboard,
plus
afew
additional
functions,
can
also be executed from
the
computer.
The
computer
controls
the
ADM-3
by
transmit-
ting
the
appropriate
ASCII codes. Displayable
character
codes will be displayed,
and
valid con-
trol
codes will be recognized
and
acted upon.
3.4.1
Remote Control Functions
The
remote
computer
can
perform
the
following
control functions:
Backspace BS (CTRL/H). Moves
the
cursor
non-
destructively
one
character
position to
the
left.
Bell BEL (CTRL/G).
Sounds
the
audible
beep
in
the
ADM-3.
Return
CR
(CTRL/M). Moves
the
cursor
non-
destructively
to
the
first
character
position
of
the
present
line.
Line Feed LF (CTRL/J).
Causes
the
entire
display
to move
upward
one line,
leaving
the
cursor
positioned
in
the
same
character
position on
the
next
new
line.
Lock
Keyboard
51
(CTRUO). Electricallylocks
the
ADM-3
keyboard,
disabling
all
keyboard
functions.
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