Block
Data
Transfer
For
example, a command
status
request
for
the
integral
printer
followed by one for
the
external
printer,
when
the
terminal
handshaking
is configured
without
DCI's
to
trigger
the
status
response. Only
the
most-recently received
request
will be responded to, because
it
will
overwrite
any
previous ones
pending
in
the
prioritized queue.
DC1
Trigger Reset
Receipt ofa
status
request
or
an
cCEc
d"
escape sequence
resets
the
terminals
cCDCl
Received"
flag. As a
result,
when
handshaking
is selected, a
DCl
must
be received before
the
response is
sent
to
the
host
computer, even
if
a
DCl
was
sent
before
the
request
or
escape sequence.
DC2 Transfer
When
the
DCl/DC2/DCl
handshake
is used,
the
DC2
character
may
be followed by
cCending
characters".These
characters
are
determined by
the
Li
ne/Page(D)
selection, on
the
Terminal
Configuration menu. When
the
Line/PageCD) field is
set
to «Line",
the
ending
is CR (LF);
when
set
to
CCPage",
there
are
no ending characters
sent
with
the
DC2.
ENTER KEY
DATA
TRANSFERS
Data
can
be
sent
to
the
computer
in
multiple-characterblocks by
using
the.
key.The
1:1
key
can
be used
as
a
substitute
for
the.
key by
entering
cCYes"
in
the
RETURN=
EHTER
field
of
the
Terminal Configuration menu.
When
the
terminal
is
in
Remote mode, pressing
the.
key
sets
pending
a block
transfer
of
data
from
the
workspace to
the
host computer. The keyboard is locked
until
the
data
transfer
is
completed.
The
data
transmitted
depends on
the
combination of
terminal
modes.The modes significant to
• key
data
transfer
are
shown
in
figure 9-1.
In
studying
the
following
paragraphs,
you should keep
the
following facts
in
mind:
•
The
data
transfer
is always
terminated
if
a block
terminator
ora non-displaying
terminator
is encountered.
•
If
the
data
transfer
is
terminated
by encountering a non-displaying terminator,
that
ter-
minatormay
or
may
not
be cleared, dependingupon
the
setting
of
the
Cl
earTerm field
in
the
Terminal Configuration menu,
as
follows:
ClearTermCK)
= NO:
Do
not
clear
the
terminator.
ClearTermCK)
=
YES:
Clear
the
terminator
.
• Both
the
field
separator
and
the
block
terminator
are
ASCII control codes
and
are
selectable
on
the
Terminal Configuration menu.
9-6
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