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4023
Users
PROGRAMMING
(cont.)
TABLE
2-2
(cont)
ASCII
CONTROL
CHARACTER
KEYBOARD
KEY
COMBINATION
RESPONSE
US(10
31
)
Field
Separator
(Field
Attribute
Code
Sub-
stitute)
Two
Character
Commands
ESC BEL
ESCFF
Clear
Page
ESC SO
Send
Page
ESC
SI
ENTER
i.e.
Send
Trans-
mittable
Only
ESCO
(Clear
Input)
_
ESC
C
G
ESC
C
L
ESC
C
N
ESC
c
O
ESCO
Performs
two
functions:
1)
Used
in
Buffer
Form
Fill-Out
Entry Sequences
as a
Field
Segregator.
The
US
code
precedes the
Field
Attribute
Code
on
the data
string
to
identify
the input data that
follows
as
having
been preceded
by
a
FAC
in
Terminal
memory.
2)
When
the
Terminal
receives
a
US
code. Terminal
logic
is
set
to
interpret
the
next
character received
as a Field
Attribute
Code.
Used
to
trigger a
hard
copy
of the displayed data
when
using
a
Hard
Copy
Unit.
ESC
BEL
is
the
computer
addressed equivalent of the
COPY
button
on
the Terminal
or
Hard
Copy
Unit.
The
Hard
Copy
Unit can
receive
and
print
video (except
for blink)
on
paper. Multiple copies
can
be obtained under
program
control
by
commanding
a
copy
to
be
made
and immediately
following
it
with
the
Read
cursor
command
(ESC
]
).
The
action of
making
a
copy
delays
the
reading
of
the
cursor
until
the
copy
is
completed.
When
the
Terminal responds with
the cursor
location,
the
program
can use
this
as signifying that
the
copier
is
ready
for
another
command.
Clear screen
command.
Performs
same
function
as
PAGE.
The
screen
is
cleared,
cursor positions to
HOME
and
all
Terminal
logic
is
initialized.
Initiates
a
send
function.
Causes
all
fields,
normally
transmittable or
not,
from
the beginning to
end
of
text,
to
be
transmitted to the
computer.
If
fields
are
contained
on
the
display,
the
Field
Attribute
Codes
are
preceded by
the
US
(31,
)
character.
When
transmission of
all
data
is
completed,
the cursor
resides
in
the left-most character
position
on
the
last
line
of the message.
Performs
the
same
function
as
ESC SO
with
the exception
that
only
transmittable
fields
are
transmitted. (Rulings are
not
transmittable.)
Initiates
the
clear
input sequence. Sets
all
unprotected data
fields
to
NUL
characters.
Used
in
the Buffer
Form
Fill-Out
Mode when
it
becomes
necessary to
clear
the input data
only
(does
not
clear rulings).
Do
not confuse with
the Clear
Page Function.
®
2-9
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