Tektronix 4954 Instruction Manual
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ronix
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4953/4954
GRAPHICS
TABLET
INSTRUCTION
MANUAL
Tektronix,
Inc.
P.O.
Box
500
Beaverton,
Oregon
97077
MANUAL
PART
NO.
First
Printing
FEB 1975
070-1791.01
•
Thl.PrintlnQ.JUN 1980
4953/4954
TABLE
OF CONTENTS
SECTION 1 DESCRIPTION
General
Graphics Tablet
Components
Tablet
Presence Area
Standard Accessories
Optional Accessories
Specifications
Page SECTION
4 SERVICING
(cent)
Page
1-1
COMSUP
Strap
Verification 4-5
1-2
Major
Component
Verification
4-5
1-2
Interconnecting
Signals
4-8
1-3
Tablet
Digitization 4-8
1-3
Block
Diagram Description
4-9
1-3
SECTION 2
OPERATION
Installation
Operation
Operating
Procedure
Header
Characters
Control
Commands
Terminal/Tablet
Interaction
Operating
Modes
Single Point/Pen
Single
Point/Presence
Multiple
Point/Pen
Multiple
Point/Presence
Graphic
Data
Input
2-1
2-1
2-1
2-2
2-2
2-3
2-5
2-5
2-6
2-8
2-9
2-10
SECTION
3
SUPPLEMENTAL
INFORMATION
3-1
AC
PoweT Requirements
AC
Power
Cord and Grounding
Requirements
Line Voltage
Selection
Fuses
Strappable
Options
Biasing
the
Tablet
SECTION
4 SERVICING
Introduction
Equipment
Required
Performance
Checks
Miscellaneous
Circuit
Verifications
Delay
Verification
Bit
1 Verification
Bit
2 Verification
Bit
3
Verification
Bit
4
Verification
Bit
5
Verification
CR Strap Verification
ESUP
Strap
Verification
HEADER
Strap
Verification
Crosshair
Operation
Verification
3-1
3-2
3-2
3-2
3-4
4-1
4-1
4-1
4-1
4-2
4-2
4-3
4-3
4-3
4-3
4-4
4-4
4-4
4-5
SECTION
5 CIRCUIT
DESCRIPTIONS
Tablet
Control Card
5-1
Tablet
Clock
5-1
Divide-by-four
5-1
Sync
5-1
Tablet
Sequencer
5-1
Wait
One-Shot
5-1
X-Counter
5-1
Y-Counter
5-2
Digital Delay
5-2
Address
Decoder
5-2
Transmit Enable
5-2
ESUP
5-2
Transmit
Initiate
5-2
Output Sequencer
5-3
Character Identifier
5-3
Output
Shift Register
5-3
Presence
Latch/True
Presence
5-4
Pen
Status
5-4
Header
Control
5-4
Crosshair
5-4
Pen
Mode
5-4
Comsup
5-4
Enq
Generator
5-5
Presence
Status
5-5
Control
Board
5-5
Line
Filter
5-5
Line
Voltage
Strapping
5-5
Power-On
Relay
5-5
180 V
Supply
5-5
4-5
V
Regulator
5-5
Buffer
Amplifier
5-6
SECTION
6 ELECTRICAL
PARTS LIST
6-1
SECTION
7 DIAGRAMS
7-1
SECTION
8 MECHANICAL PARTS
LIST
8-1
CHANGE
INFORMATION
W
REV
A, FEB
1979
\
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Yr:^:.
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Fig.
1-1.
4953
and
4954
Graphics
Tablets.
4953/4954
4953/4954
Section
1
DESCRIPTION
GENERAL
The
4953
and
4954
Graphics
Tablets
(Fig.
1-1)
input
graphic
data
to
a
computer,
through
a
TEKTRONIX
401
0-
Series
Graphic
Display
Terminal.
The
devices
are
iden-
tical
except
for
the
size
of
the
tablets;
the
4953
is
an
11
inches
by
11 inches
tablet,
while
the
4954
is
40
inches
by
30
inches.
Cleaning
agents that
contain
hydrocarbons
will
dissolve
the
tablet
surface.
The
polystyrene
surface
will
react,
similarly
to
most
petroleum
derivatives.
Safe
cleaning
agents are
alcohols—
ethyl, methyl,
isopropyl—or
soaps
and
detergeMs
that
do not
contain
hydrocarbons.
The
basic
function
of
the
Graphics
Tablet is to
convert
the
position
of
the
pen on
the tablet
surface
to
a
corresponding
digital
position that
is in usableform
forthe
4010-Series
Computer
Display
Terminal.
The digital
posi-
tion
may
be simultaneously
transmitted to the
terminal
and
computer,
or it may
be transmitted
to
the
computer
through the
terminal
bus alone,
with
no local
copy
of the
transmission
appearing
on
the
terminal
display.
The
position
of
the
Graphics
Tablet in
a computer/terminal
system
is
shown
in
Fig,
1-2.
The
4010-family
terminal
can
operate
in a
mode termed
Graphic
Input
(GIN),
in which
identifiable
points
are
digitized
and
sent
to
the
computer.The
Graphics
Tablet
extends
the
terminal's
ability
to input
this type
of
graphic
information,
inputting
points
continuously
or
one
at
a
time,
in
a
mode
similar
to
the
terminal's
Graphic
Input
mode.
Input
is
accomplished
by first
enabling
the
tablet
with
a
three-character
command
string,
and
then positioning
the
pen
along
the
surface
of the
tablet
area.
Data input
may be
Continuous
or one
point
at a time,
ft
may
be dependent
on
pen
proximity
only
oronthe
condition
of the
pen-switch,
and
local
display
(on the
screen
of the
4010-series
terminal)
may
be
selected
on or
off.
In
addition,
each
coordinate
value (X
and
Y) may
be
defined
by 10
bits of
data
or
12
bits
of data.
Ail
of
the
above variables
are
determined
by the
third
character
in the
command
string,
as
explained
in the
Operation
Section.
4953/4954
:
GRAPHIC TABLET
:
;?X~rv^ss#y>,z
}
^
1791-02
;
Fig.
1-2.
Graphics
Tablet
position
in a system.
REV.
A, AUG.
1977
1-1
Description—
4953/4954
The
Graphics
Tablet
functions
as
an
integral
part of the
terminal
hardware by
means
Of
an interface
card
con-
nected
to
the
terminal
minibus. The
minibus
is
the
terminal's
main data
routing
avenue. Any
device
con-
nected to
the
terminal
minibus
can respond to
the
Tablet
data
sent
through
that
minibus.
This allows
the
operator
to
format
Graphics
Tablet
data off-line from
a computer,
and
then
send
that
data to
the computer when
the
desired
graphic
input
has been
obtained.
GRAPHICS
TABLET
COMPONENTS
The
four
main components
of the
Graphics
Tablet
are
the
writing surface
(Tablet),
the Writing
Pen, the
Power
Module, and
the
Tablet
Control Card
which plugs
directly
into
the
minibus of
the
4010-Series Computer
Display
Terminal.
Tablet.
The tablet is a
flat writing
surface,
magnetically
prebiased, on
which
paper
(film,
etc.) maybe
placed
and
then
traced to
input
data
to
the computer.
Under
the
surface
of the
tablet are
two
grids of
magneto-strictive
wires, one
set for the
X axis and
one set for
the
Y
axis.
An
acoustic
wave
is
sent
along
these
wires and
detected
by
the
writing
pen; the
time
-between when the wave
is sent
and
when it
is
received
allows
identification
of data
points
in
a grid
of 1024
X
points by
1024 Y points.
Identifiable
points
are 0.01 inch
apart.
The
4954
maintains
0.01 inch
resolution
by
operating
with
12
bits
of graphic
data
per
point,
or
3840 by 3072
points-
Point
identification
can be
more
clearly
understood
if
one
thinks
of
the writing
surface
as containing
1024
vertical
lines and
1024
horizontal
lines.
An
identifiable
location on
the
writing
surface
can
be
established
at
the
intersection
of
any
vertical
and
horizontal line.
These
identifiable
locations
directly
correspond
to
the
iden-
tifiable points
of the
terminal's
display
screen.
In
the
optional
accessory
cursor,
the
switch
function
is
performed
by
the
button
on
top
of
the
cursor.
Power
Module.
The
Power
Module
contains
the
power
supply,
the
tablet
pulser
and
preamp,
and
the
connections
which
tie
the
Graphics
Tablet
components
together.
In
addition,
the
Power
Module's
front
panel
contains
the
Power
Switch
and
Indicators,
The
Indicators
provide
the
following
information:
Indicators
READY-"On"
indicates
that
the
Tablet
is
ready
to
send
another
point.
PEN—
illuminates
when
pen
pressure
is
applied.
DATA—
Illuminates
when
data
is in
the
process
of
being
transferred.
POWER—
Illuminates
when
Power
is
applied
to
both
the
Graphic
Tablet
and
the
terminal.
Tablet
Control
Card.
The
Tablet
Control
card
contains
those
circuits
necessary
to
convert
the
pen
signal
to
its
digital
equivalent.
This
card
connects
directly
to
the
terminal
minibus,
and
contains
circuits
for
format
chang-
ing,
data
transfer,
"header
character"
data,
and
other
tablet-related
functions.
#
Writing
Pen. The
tip of
the
writing pen
contains
a
sensitive
pick-up coil
which,
when moved
into
the
presence
of
the
tablet,
detects the
change in
magnetic
field caused
by the acoustic
wave.
The
detected
signal
is
then
converted to
digital
information
that directly
relates
to
pen
position. Once the
specific
operating
mode
has
been
established, the
writing
pen provides
sufficient
control
to
handle all data
transfer (stop and
go functions)
to
the
terminal
and
computer.
An
optional
ballpoint
filler
may be
used
in place
of
the
dry
filler for the pen
f
so the
operator
can
draw
the
information he is
sending
to the
computer;
otherwise,
the
standard
inkless
filler
can
be
used.
The
pen
can be
replaced
by an
optional
accessory
"cursor"
if
greater
accuracy
is
required
(such
as
tracing
a
drawing).
A
pen switch is located
within
the pen, and
is
activated
by pressing
the pen tip against
the
tablet
surface,
pressing
the
filler slightly into the
pen.
TABLET
PRESENCE
AREA
The
Graphics
Tablet
responds
to
the
pen
(In
Presence)
whenever
the
pen
is
within
0.125
inch
of
the
surface
of
the
tablet
In
addition,
only
a
certain
portion
of
the
tablet
surface
represents
the
valid
data
area.
The
location
of
this
area
is
dependent
on
the
biasing
of
the
tablet,
but
the
size
is
standard
for
each
of
the
tablet
sizes.
On
the
4953,
this
area
is
10.24
inches
in
each
axis;
on the
4954,
this
area
is
38.4
inches
in
the
X-axis
by
30.72
inches
in
the
Y
axis.
This
area
is
not
marked
on
the
tablet
surface,
since
it
may
move
slightly
each
time
the
tablet
is
biased.
It
may
be
located
by
the
operator
by
enabling
the
tablet
with
an
ESC !
N,
so
that
the
tablet
disarms
when
the
presence
area
is
exceeded.
He
may
then
slowly
move
the
pen
to
the
border
of
the
tablet,
and
watch
to
see
when
the
READY
indicator
is
ex-
tinguished.
This
marks
one
presence
boundary
point.
This
point
may
be
marked
and
the
procedure
tepeated
to
find
the
complete
boundary.
An
example
is
shown
in
Fig.
1-3.
1-2
REV.
A,
JULY,
1975
. TEKTRONIX
'•
V
m p
m
^^^m
mxm
;
ft
Out
of
Display
Area
Presence
Boundary
Display
Area
•
.
;:,:-^;^
,
.;-.:.;:V'.
,
;
r;v;'V:v
;
1791-03
Fig.
1-3.
Tablet
presence area.
STANDARD
ACCESSORIES
The
following standard
accessories
are
included with
each
Graphics
Tablet.
Instruction
Manual
Reference
Card
Pen (with inkless
filler)
Biasing
Magnet
(4953)
Biasing
Magnet
(4954)
070-1791-00
070-1787-00
119-0621-00
119-0686-00
119-0687-00
STANDARD
ASSEMBLIES
Power Module
Interconnecting Cable
(Power Module
to
Tablet Control Card)
Tablet Control Card
Tablet
(4953
only)
Tablet
(4954
only)
620-0240-00
012-0568-00
670-3536-XX
119-0619-00
119-0620-02
Description—
4953/4954
SPECIFICATIONS
Power Specifications
The Graphic
Tablets operate
from any
of the
line
voltage ranges
shown
in
Table
1-1.
TABLE
1-1
Operating Voltage
Ranges
Voltage Frequency Tolerance
Range
104 Vac
48-440
Hz
±10%
94-114
Vac
115 Vac
104-126
Vac
208
V
ac
187-228
V
ac
240
V ac
216-264
V
ac
Tablet
Interface
Current
Requirements:
-15
V—at 80 mA, drawn from
terminal bus
+15 V—at 40
mA,
drawn from
terminal bus
180 V—at 10
mA, supplied by
the
tablet power
supply
+5
V—at 1.5
A, supplied by
the
tablet
power supply
Environmental
Specifications
Temperatures:
OPTIONAL
ACCESSORIES
Operating,
from
0°C
to
40°
C
Storage, from
—
30°C
to
40°
C
Humidity:
Storage to 95%
humidity
at 30°
C
Presence
Distance
Specification
With
the pen
or
cursor
within
0.1 25
inch
of
the
tablet
surface, the
data obtained will be
stable
with respect
to
the
steadiness of the physical
positioning
of
the
pen
orcursor.
Presence
Area
Specification
4953
10.24
inches
by
10.24
inches
4954
38.4
inches by
30.72
inches
The
following optional
accessories
are
available forthe
Graphics
Tablet, at
additional
cost.
•
Cursor
(replaces pen)
Software support
package
(with paper
tape)
(with
source card deck)
Pen
Fillers
Dry
Blue
119-0622-00
4010A0601
4010A06
D1
6-0335-00
016-0334-00
Tablet
Error
The
maximum error produced by
the
Graphics
Tablet
in
the digitizing procedure
is
defined
as
1/4
of a
least
significant
bit
per
inch, or
0.0025 inch
of
error
per inch
of
tablet surface.
This
translates to a
maximum
error
specification
as
follows:
4953
4954
±0.03
inch
over
entire
tablet
surface
±0.10
inch
over
entire
tablet
surface
REV
C.JUN
1979
1-3
4953/4954
Section
2
OPERATION
INSTALLATION
Installation
of
the Graphics
Tablet consists of
making
certain
the
unit
is
wired for
the available line voltage
and
connecting
to
a
power
source,
selecting Strappable
Options
to
fit user requirements,
connecting the Graphics
Tablet
components
together,
and installation of the
Tablet
Control
card into
the
terminal minibus. Line Voltage
Selection
and
Strappable
Options
are
covered under
separate
headings
within Section
3-
To
connect the
Graphics
Tablet components
.together,
proceed as
follows.
Connect
the cable from the
pen
to J1014 on the rear
panel of
the Power Module.
There
is a keying notch
on
the
top of the rear
panel connector, which
is
to align
with
the key
on the
tablet
cable
connector (Fig.
2-1).
2.
Connect the cable from
the pen to
J1016
on the
rear
panel of
the
Power
Module.
There is a keying
notch
on
this' -connector also, to
align
with the
key
on
the
pen
cable
connector (Fig.
2-1).
3. Connect the
25-pin
connector
on
the Tablet Control
card
interconnecting
cable
to J1010
on
the Power
Module rear
panel, and
secure
with
the
two attaching
screws
(Fig.
2-2).
To
Tablet
1791-04A
&!!&?
Fig.
2-1,
Pen and
Tablet e&nagsfion.
Fig.
2-2.
Tablet
Control
Card cable
connection.
A. Install
the
Tablet Control
card
into a
spare
slot in
the
terminal minibus.
Thread the
cable from
J1010
on
the
Power
Module
through
the
access
slot
on
the rear of
the
terminal
pedestal,
then
attach
the
two
harmonica
connectors
(P231
and P232)
to
their
positions on
the
Tablet Control
card
(Fig.
2-3).
(Make
certain
that
pin
1
of
each
connector
aligns
with
pin 1
of
the card
connectors;
they
are
marked
with
small carets,)
Connect
the
ground
lug to
the
ground
spades
under
the
card rack
within the
terminal
pedestal.
It
may
be
necessary
to
install a
Mother
Board
extender
in
the
terminal to
provide
room
for
the Tablet
Control
card.
Refer to the
terminal
manual for
details.
OPERATION
Operating
Procedure
Operation of
the
Graphics
Tablet
consists
of
enabling
one
of
the four
basic
Operating
Modes,
then
manipulating
the
pen on
the
tablet
surface.
The pen may
be
pressed a£,
REV
D.FEB
1979
2-1
Ope
ra
tio
n
—4953/4954
"
-
•--"-»-
"•-
~
-
,
,-.-
,-
,
-,„ ....
""•""""•"—•"''
'
*
-
.-
.
1791-06.1
Rg.
2-3.
Installing
ihe
Tablet
Control
Card.
necessary
to
input
coordinate
points.
An
Operating
Mode
is
enabled
by
transmitting
a
three-character
Control
Command
sequence,
either
from
the
terminal
keyboard
or
from
the
computer,
under
program
control.
The
selected
Operating
Mode
determines
when
data
is
sent,
how
much
data
is
sent,
and
when
it
is
necessary
to
press
the
pen
to
transmit
data.
Operating
Modes
and
mode
variables
are
descr.bed
in
the
Operating
Modes
and
Control
Com-
mands
descriptions
within
this
section.
When
enabled
and
operating,
the
Graphics
Tablet
transmits
digital
coordinate
data
corresponding
to
the
pen
.position;
this
data
is
sent
through
the
terminal
bus
to
the
terminal
display
and/or
to
the
computer.
The
use
of
this
data
is
defined
by
the
program
which
is
using
it.
It
may
be
used
to
define
single
points
which,
in
turn,
may
be
defined
as
some
value
or
answer
in
a
"menu
selection"
routine
Thedata
may
also
be
used
to
drawvectors
between
points'
or
rt
may
be
used
to
trace
or
input
a
curved,
continuous
Mne,
such
as
in
a
mapping
routine.
The
possiblities
are
dependent
on
the
computer
software
that
is
using
the
Q3T3.
Header
Characters
Each
coordinate
point
is
preceded
by
a
Header
Character
data
haf? TT^'
*
^
aPPr
°
Priate
™
de
to
a
«e
data
that
follows.
In
addition,
the
Header
Characters
are
used
.by
computer
software
to
interpret
the
data
string
that
follows
The
.parteular
Header
character
that
is
transmitted
before
each
coordmate
point
is
dependent
on
the
Operating
Mode
and
the
action
of
the
pen,
as
explained
in
each
Operating
Mode
description.
The
Graphics
Tablet
is
factory-wired
to
respond
with
one
of
four
Header
Characters.
(Header
Charac-
ters
may
be
changed
from
Control
Characters
to
letter
Son^
f
th
a
f
deSCr
,
ibed
'"
the
Stra
PP
able
Options
descrip-
tion,
but
the
terminal
will
display
M
and
characters
rather
than
graphics;
Local
Display
is
therefore
not
recommended
i
when
letter
Header
Characters
are
used)
om
menaed
I
Control
Commands
The
Graphics
Tablet
is
active
whenever
power
is
applied
to
both
the
terminal
and
the
Graphics
Tablet
The
tablet
,s
enabled
and
the
Operating
Mode
is
established
by
a
control
Command
sequence
consisting
of
three
ASCII
characters;
these
are
ESC
!
and
a
third
character
(Com-
iTn TTV**
firSt
five
bits
of
which
establish
the
vanables
of
the
Operating
Mode
(Table
2-2).
Command
SmtS.T k
6
!
e
'
eCted
f
°
r
the,r
desired
functi
°^
from
Table
2-3,
which
is
an
ASCII
code
chart
appended
to
hZI
li
fu
"
ctions
are
associated
with
each
character.
Note
that
the
Control
Command
sequence
does
not
print
on
the
terminal
screen
if
the
tablet
is
connected
and
.enacted.
2-2
REV
B.FEB
1979
Operation—
4953/4954
TABLE
2-1
Operating
Mode
Variables
Bit
Condition
1
(LSB)
2
(also
see
additional
functions)
«
Operation
Local
Display
On.
This
bit
condi-
tion
causes
the
transferred
data
to
be
displayed
on
the
terminal
screen.
Graphic
data
is
displayed
only
if
the
HEADER
strap
is
in
the
CONTROL
position.
If
the
HEADER
strap
is
in
the
LETTER
position
alphanumeric
characters
will
be
displayed;
Local
Display
is
not
recommended.
Local
Display
Off;
This
bit
condi-
tion
causes
the
data
to
be
transferred
through
the
terminal
bus
without
terminal
screen
dis-
play.
Multiple
Point
The
Tablet
is
allow-
ed
to
send
as
many
points
as
desired,
until
another
Control
Command
is
received
to
clear
the
tablet
or
change
operating
modes.
Single
Point
One
point
is
sent,
the
Tablet
then
is
disabled.
The
Tablet
must
be
enabled
again
with
another
Control
Command
to
send
more
data.
(Only
one
operation
is
allowed
for
leach
enabling.)
Operations
are
Data
Point
To
Host
Sending
Status
On
Leaving
Presence,
and
Disarming
the
Cross
Hairs.
Presence.
The
alpha
cursor
tracks
the
pen
when
the
pen
is
in
presence
(within
1/8
inch
of
tablet
surface),
.if
Local
Display
is
selected.
When
the
pen
is
pressed,
graphic
coordinate
points
are
sent
to
the
computer.
Information
for
positioning
the
terminal's
Alpha
cursor,
which
is
generated
while
the
pen
is
in
presence
and
the
pen
switch
is
open,
is
not
transmitted
to
the
computer
unless
the
COMSUP
strappable
option
is
in
the
OUT
position.
Pen.
A
coordinate
set is
sent
when
the
pen
is
depressed.
4
(also
see
additional
functions)
6
&7
Disable
on
Leaving
Presence.
Setting
this
bit,
with
the
status
strap
set
to
IN,
will
disble
the
Graphics
Tablet
when
the
pen
is
removed
from
tablet
presence
(lifted
1/8
inch
or
moved
past
the
presence
boundary)
if
the
terminal
is
ON
LINE.
The
Graphics
Tablet
must
be
enabled
again
to
send
more
data.
Regardless
of
the
condition
of
Bit
4,
an
INQUIRE
signal
is
transmitted
by
the
tablet
interface
when
the
pen'
leaves
presence.
INQUIRE
causes
the
terminal
to
place
its
current
status
information
on
the
data
lines,
just
as
if
the
terminal
had
received
an
ESC
ENQ
sequence
from
the
computer.
When
Single
Point
is
selected
(Bit
2)
and
the
pen
leaves
presence,
the
INQUIRE
signal
is
transmitted
the
next
time
the
tablet
is
enabled.
No
Disabling
on
Leaving
Presence.
Pen
Leaving
Presence
has
no
effect
on
the
Tablet
enable,
but
still
sends
terminal
status
if
the
status
.strap
is
set
to
IN.
12
bit.
12
bits
of
data
are
sent
for
each
coordinate.
(See
Graphic
Data
Input)
10
bit.
10
bits
of
data
are
sent
for
each
coordinate.
(See
Graphic
Data
Input.)
Not
used.
Additional
functions
Clear.
Any
character
with
bit
4
-
1
and
bit
2
=
will
clear
(disable)
the
tablet.
Terminal
status
will
automatically
be
sent
the
nexttime
the
Tablet
is
enabled
if
the
pen
leaves
presence
after
the
last
data
transmission.
Terminal/Tablet
interaction
Some
knowledge
of
the
terminal
operating
modes
is
required
for
complete
understanding
of
Graphics
Tablet
operation.
Refer
to
the
terminal
Users
Manual
for
such
information.
REV
B.FEB
1979
2-3
Operation—
4953/4954
TABLE
2-2
COMMAND
CHARACTER
ASCII
CHART
10
BITS
12
BITS
10
BITS
12
BITS
10
BITS
12
BITS
10
BITS
12
BITS
B7
86
B6
£
BITS
B4 B3
B2 E
*,
1
•',
1
».
,
^
1
1f
.
11
,
CONTROL
HIGHX8.Y
GRAPHIC
INPUT
LOWX
LOWY
i
a
N.UL
OLE
76
SP
32
48
@
64
p
80
\
96
P
772
LOCAL
OFF
SINGLE
POINT
P
E
N
P
R
£
I
N
C
E
1
SOH
7
DC1
17
I
33
1
49
A
65
Q.„
a
97
q
113
LOCAL
ON
1
(
3 STX
2
DC2
7a
7/
34
2
50
B
66
R
82
b
98
r
114
LOCAL
OFF
MULTI-
-
PLE
POINT
PEN
LEAVING
1
i
i ETX
3
DC3
79
#
35
3
57
C
67
S
83
c
99
s
775
LOCAL
ON
PRESENCE
HAS
1
c
5
EOT
4
DC4
20
$
36
4
52
D
68
T
84
d
700
t
776
LOCAL
OFF
LOCAL
ON
SINGLE
*
POINT
>N0
EFFECT
ON
1
1
ENQ
5
NAK
27
%
37
5
53
E
69
U
85
e
707
u
777
TABLET
ENABLE
1
1 (2
)
ACK
6
SYN
22
&
38
6
54
F
70
v
86
f
702
V
118
LOCAL
OFF
MULTI-
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PLE
POINT
1 1 1
BEL
7
ETB
23
/
39
1
55
G
77
W
87
g
703
w
119
LOCAL
ON
10
BS
8
CAN
24
40
8
56
H
72
X
88
h
704
X
720
1
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HT
9
EM
25
41
9
57
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89
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705
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727
>-
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IF
70
SUB
26
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-
«
58-
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74
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90
J*
706
z
722
LOCAL
OFF
MULTI-
-
PLE
POINT
P
E
N
TABLET
1 1
1
VT
77
ESC
27
+
43
5
59
K
75
[
97
k
707
{
723
LOCAL
ON
IS
DISABLED
WHEN
PEN
LEAVES
1 1
FF
12
FS
28
5
44
<
60
L
76
\
92
I
708
I
1
724
CLEAR
P
1 1
1
CR
73
GS
29
45
61
M
77
]
93
m
709
}
125
PRESENCE
1 1
1
SO
74
RS
30
46
>
62
N
78
A
94
n
770
726
LOCAL
OFF
MULTI-
-
PLE
»
POINT
R
E
S
•
E
H
C
E
1
1
1 1
SI
75
US
31
/
47
?
63
79
~
95
111
fiUBOUT
(DEL)
727
LOCAL
ON
I79I-07
2-4
REV
A,
FEB
1979
Operation—
4953/4954
The
Graphics
Tablet
operates
in
four
basic
modes;
slight
differences
occur
depending
on
whether
Local
Display
is
selected,
whether
10
or 12
bits
of
data
is
to
be
transferred,
and
whether
it
is
desired
that
the
tablet
be
disabled
when
the
pen
leaves
tablet
presence.
The
four
basic
modes
are
Single
Point/Pen,
Single
Point/Presence,
Multiple
Point/Pen,
and
Multiple
Point/Presence.
All
modes
are
enabled
by
transmitting
a
Control
Command
sequence
consisting
of
three
ASCII
characters;
these
are
ESC
!
and
a
third
character
to
select
the
Operating
Mode
and
its
variables.
(See
Control
Commands.)
Regardless
of
the
Graphics
Tablet
Operating
Mode,
when
the
pen
is
brought
into
presence
and
the
terminal
is
in
Graphic
Plot
or
Alpha
Mode,
no
data
is
input
from
the
Graphics
Tablet,
if
COMSUP
is
strapped
IN as
described
in
Strappable
Options.
(Note
that
if
COMSUP
is
OUT,
Alpha
Cursor
positioning
data
is
transferred
to
the
computer.)
However,
if
the
terminal
is
ON
LINE
and
is
in
Graphic
Input
(GIN)
mode
with
the
crosshair
displayed,
the
Graphics
Tablet
sends
the
:
(colon)
Header
Character
when
the
pen
is
brought
into
presence.
This
causes
the
terminal
to
transmit
the
coordinates
of
the
crosshair
intersect
point,
and
causes
tbe
crosshair
cursor
to
dis-
appear.
Because
the
terminal
transmits
crosshair
position
data
bytes
in
the
reverse
order
of
the
Graphics
Tablet
(crosshair
transmission
order
is
HIX,
LOY,
HIY,
and
LOY;
Graphics
Tablet
transmission
order
is
HIY,
LOY,
HIX
and
LOX),
the
coitin
character
that is
followed
by
the
crosshair
coordinates
notifies
software
to
look
at
that
coordinate
data
string
in
reverse
order.
Software
can
then
be
readied
for
the
first
graphic
input
bytes
from
the
Graphics
Tablet.
(Note
that
if
Single
Point
is
selected
in
the
Operating
Mode,
transmission
of
the
crosshair
coordinate
disables
the
tablet;
it
must
be
re-enabled
with
another
Control
Command.)
Operating
Modes
NOTE
Do
not
change
Operating
Modes
while
the
pen
is
in
presence;
erroneous
Header
Characters
way
he
transmitted.
between
points,
vectors
are
drawn
between
successive
points;
the
alpha
cursor
is
not
displayed
after entry
of
the
first
point
The
first
point
after
entering
presence is
always
preceded
by
a
GS
Header
Character;
subsequent
points
are
preceded
by
a
SUB
Header
if
the
pen has
not
left
presence
between
points.
If
the
pen
leaves
presence
while
the
Graphics
Tablet
is
enabled,
it
signals,
the terminal
to
transmit
status
if
the
terminal
is
ON
LINE,
just
as if
it
had
received
an
ESC
ENQ
sequence
from
the
computer. If
the
pen
leaves
presence
after
data
has
been
sent, while
the
tablet
is
not
enabled,
then
status
will
be
sent
the
next
time
the
tablet
is
enabled.
If
the
Graphics
Tablet
is again
armed
for
Single
Point/Pen
and
the
pen
is
brought
into presence
and
pressed,
another
GS
Header
Character
is transmitted
followed
by
the
pen
coordinates;
the
alpha
cursor is no
longer
displayed.
Subsequent
points
are
again
preceded
by
SUB
Header
Characters.
Atypical
operating
sequence
is
illustrated
in
Fig.
2-4.
First-Time
Operation;
Single
Point/Pen
Mode.
This
procedure
may
be
used
to
familiarize
the
operator
with
the
characteristics
of
Single
Point/Pen
Mode
wben
operating
the
Graphics
Tablet
for
the
first
time.
1 .
Strappable
Options
should
be
in
their
factory-wired
positions:
COMSUP
in,
DELAY
in,
ESUP
out,
CR
out,
and
HEADER
in
the
CONTROL
position.
TheTablet
Size
strap
should
be
set to
SMALL
for
the
4953,
or
LARGE
for
the
4954.
2.
With
the
Graphics
Tablet
installed
and
with
power
applied to
the
tablet
and
the
terminal,
enable
the
Graphics
Tablet
for
Single
Point/Pen
mode
with
a
three-character
Control
Command
sequence
from
the
terminal
keyboard
(ESC
! 1
for
12
bits;
ESC
i A
for
10
bits).
The
READY
indicator
should
light.
3.
Place
the
terminal's
LOCAL/LINE
switch
in
the
LINE
position.
W
Single
Point/Pen.
Single
Point/Pen
mode
is
enabled
by
a
Control
Command
which
has
bits 2
and
3
=
in
the
Command
Character;
for
example,
ESC 11(12
bits)
or
ESC
! !
(10
bits).
In
this
mode,
a
single
coordinate
point,
preceded
by
a
GS
Header
Character,
is
sent
when
the
pen
is
depressed
in
the
presence
area
of
the
tablet;
the
tablet
is
then
disabled
from
sending
more
data
until
another
Control
Command
is
received.
After
another
Control
•
Command
is
received,
the
pen
may
be
pressed
again
to
enter
another
coordinate
preceded
by
a
SUB
Header;
pen
pressure
must
be
released
to
release
the
pen
switch
between
each
point,
but
the
pen
may
not
leave
presence.
If
Local
Display
is
selected
and
the
pen
remains
in
presence
4.
Bring
the
pen
into
presence
at
the
lower
left
corner
of
the
tablet,
(about
1-1/2 inches
in
from
the
bottom
and
left
tablet
margins),
and
press
the
pen
once.
The
DATA
and
PEN
indicators
should
blink,
and
the
READY
indicate
should
be
extinguished.
5.
Without
removing
the
pen
from
tablet
presence^
move
the
pen
to
a
point
half
way
up
the
tablet
surface
and
1-1/2
inches
in
from
the
right
margin.
Transmit
another
Control
Command
sequence
from
the
terminal
ke
y
boa
^
d
v
.Use
ESC
1
1
for
12
bits,
or
ESC
! A
for
10
bits.
The
READ
y
indicator
should
light.
REV.
A,
JULY,
1975
2-5
!
1
1
. „
If
if.
Operation—
4953/4954
i
! ,1
TEKTROISJIX
;
-
g
,
N,
Presence
Boundary
Resultant
Display
-
JL
(5
i
x
-t-
X
&
Pen Path
0-
Control
Command issued
(from
terminal keyboard or
from
computer); for example.
Esc
! 1.
Point
where
pen
is
pressed.
179.1-08
Fig.
2-4.
Operation
sequence in Single Point/Pen
mode. Note
that vectors are drawn between points
where
the
pen is pressed if
the pen
does
not
leave
presence.
If
the
pen
leaves
presence, two
Control Commands are
required
to
re-enable;
the
first
causes
Status
transmission and
the second enables
the tablet.
6. Press thepen. The
DATA
and PEN indicators
should
blink once, and the
READY indicator
should
be
ex-
tinguished.
On
the
terminal
screen,
a
vector
should be
displayed between the
lowlr
left
and
upper right corners
of the
screen.
7. Lift the pen from
presence,
and
while
it is lifted
send
the Control Command
(same as previously used)
from
the
terminal keyboard. Note
that when the
Command
Character (third character)
is sent, the
DATA
indicator
blinks once.
This occurs
when the
ENQ signal occurs,
causing
the terminal to
transmit
status. Repeat the
sequence
and
note
that the
READY
indicator illuminates.
8. Bring
the
pen into
presence
about
1-1/2
inches in
from the
lower right corner,
and press
the pen once.
The
DATA and
PEN indicators
should
blink
once,
and the
READY
indicator should
be
extinguished;
no display
should occur
on the
screen. Leave
the pen
in
presence.
9. Enable the Single
Point/Pen
mode with another
Control Command
(ESC ! 1
for
12 bits; ESC ! A for 10 bits)
from the
terminal keyboard.
The
READY indicator
should
illuminate.
10. Without
leaving presence,
move the pen
to a point
about
"1-1/2 inches
trom the left-hand.
tablet
border, about
3/4 of
the
distance
to the top
edge
ot the tablet.
Press
the
2-6
pen once;
the DATA and
PEN
indicators
should blink
once,
and
the
READY indicator
should
be extinguished.
A
vector
should appear on
the
screen,
from
the lower right
corner of
the screen to
the
upper
left
corner.
Single
Point/Presence. Single
Point/Presence
mode is
enabled by a
Control
Command
which
has bit2
-
and bit
3
=
1
in the Command
Character; for
Example,
ESC! 5
(12
bits)
or ESC
1
%
(10
bits). In:
this
mode,
one single
coordinate
point is compiled
and sent
for each
time the
tablet
is
enabled; however,
when
that
point
-is
compiled
and sent
is dependent
on
the
COMSUP
Strappable
Option.
When COMSUP
is strapped IN
(factory-set
position),
single
presence sends
no data
to the
computer
until
the
pen
is pressed while in presence.
Note,
however,
that
when
the
tablet is enabled for Single
Point/Presence
with
Local Display on, the
terminal's
alpha
cursor
tracks the
pen
as
long as
it
is in
presence and
not
pressed. When
the
pen
is
pressed, a single
coordinate
point
is
sent, preceded
by
a GS
Header and the
tablet is
disabled.
A
second point
may be sent
in several ways,
depending
on user
re-
quirements.
If
the pen is
held
depressed
while
the
Graphics
Tablet is
re-enabled,
then another coordinate
is
sent,
preceded
by
a
SUB
Header
Character, and
a
vector
is
drawn
between
the
first and
second point.
The point
which
is
transmitted
is
@
Operation—
4953/4954
W
the
pen
position
at
the
time
the
Control
Command
is
received.
If,
on the
other
hand,
pen
pressure
is
released
between
points
while
the
tablet
is
ra-enabled
with
another
Control
Command,
tnen
the
next
point
is
transmitted.
In
this
case,
the
second
point
is
preceded
by
a US
Header,
indicating
the
release
of
the
pen. If
the
Tablet
is
again
rearmed,
the
terminal
Alpha
Curser
will
track
as
before.
Using
this
procedure,
therefore,
alternates
GS
and
US
Header
Characters;
no
vectors
are
drawn
even
if
Local
Display
is
selected.
Note,
however,
that
if
the
computer
program
is
set
to
re-enable
the
tablet
as
soon
as
the
point
is
transmitted,
then
more
than
one
point
may
be
transmitted
for
each
pen
depression,
as
above.
The
intermediate
points
will
be
preceded
by
SUB
Header
Characters.
A
typical
operating
sequence
is
Illustrated
in
Fig.
2-5.
If
the
COMSUP
option
is
strapped
OUT,
operation
differs
in
the
following
ways.
When
the
tablet
is
enabled,
the first
point
is
transmitted
as
soon
as the
pen
enters
presence,
preceded
by
the
SUB
Header.
The
transmitted
coordinate
is
that
of
the
pen's
position
when
it
entered
presence.
If
Local
Display
is
selected,
the
terminal's
alpha
cursor will
move
to
the
display
position
relative
to
that
of
the
pen. If
the
pen
remains
in
presence
while
the
tablet
is
enabled
again,
another
point wit!
be
transm
itted
as
soon
as
the
Control
Command
Sequence
is
completed.
This
point
will
be the
coordinates
of
the
pen's
position
when
the
Control
Command
sequence
is
completed,
and
will
also
be
preceded
by
a
SUB
Header
Character;
the
cursor
will
move
to the
new
pen
location.
No
vectors
are
drawn
in this
mode, if
COMSUP
is
strapped
OUT,
but
coordinate
points
are
sent to
the
computer.
Regardless
of
the
condition
of
COMSUP,
if
the
STATUS
strap
is IN,
leaving
presence
causes
the
terminal
to
send
status,
as if
it
had
received
an ESC
ENQ
sequence
from
the
computer;
the
way
in
which
it is
sent
differs
somewhat.
If
COMSUP
is
strapped
IN,
this
occurs
in
the
following
ways:
If
the
Graphics
Tablet
is
enabled
with
the
pen
in
presence
but
the
pen
has
not
been
pressed,
status
is
transmitted
as
soon
as
the
pen
leaves
presence.
If
the
pen
has
been
pressed,
transmitting
a point,
and
the
pen
then
leaves
presence,
status
is
sent
when
the
next
Control
Command
is
received.
If
COMSUP
is
OUT,
the
pen
must
be
removed
from
presence
and
the
tablet
then
enabled;
status will
then
be
sent.
First-Time
Operation;
Single
Point/Presence
Mode.
This
procedure
may
be
used
to
familiarize
the
operator
with
the
characteristics
of
this
mode
when
operating
the
Graphics
Tablet
for
the
first
time.
1.
Strappable
Options
should
be
in their
factory-wired
positions:
COMSUP
in,
DELAY
in,
ESUP
out,
CR
out,
and
4ft-
.<£$:£
'7..;
TEKTROrSUX
-__-—
--KE)
£©---_----
©
Presence
Boundary
Resultant
Display
\™y
=
Control
Command
issued.
x
=
Point
where
pen
is
pressed
(and
held
pressed).
1791-09
Fig,
2-5.
Operation
sequence
in
Single
Point/Presence
mode.
Note
that
vectors
are
drawn
between
Control
Commands
if
the
pen
Is
held
depressed.
REV
A,
FEB
1979
2-7
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