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HP 262SA - Page 149

HP 262SA
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Data
Communications
BUFFER
SIZE.
You
must
set
the
amount
of
terminal
memory
allocated for
use
as
input
and
output
communication
buffers. When
the
terminal
is
inputting
data
it
uses
this
space for
input
buffers.
When
the
terminal
is
outputting
data
the
buffer space is divided
into
two
or
more
output
buffers.
The
basic
terminal
configuration
uses
two 250
byte
output
buffers.
When
the
terminal
isselected,
any
data
waiting
in
the
output
buffers is lost.
The
output
buffers
then
become
input
buffers to hold
data
sent
from
the
computer
until
the
terminal
can
process
the
characters.
The
terminal
will respond to select sequences
and
incoming
text
blocks
with
a WACK
when
there
are
no
input
buffers available.
The
terminal
will respond
with
an
ACK
as
soon
as
a buffer
becomes available.
Note
that
if
too
large
a block is
sent
to
the
terminal
following
the
ACK,
it
may
result
in
a
buffer
overflow
and
an
EOTwill be
returned.
In
such
a case,
either
reconfigure
the
terminal
to a
larger
buffer size,
or
reduce
the
buffer size
of
the
host
computer.
Memory is allocated from
the
terminal's
display
memory
so
that
the
larger
the
buffer
size,
the
smaller
the
amount
available
to display memory.
The
output
buffer size
can
range
from 128 to 2048 bytes.
It
is
set
using
the
~Bu
f 5 i z
e'
field
of
the
data
comm
configuration
menu.
The
maximum
input
buffer size is
determined
by
multiplying
~~Bu
f 5 i z
e"
by
HNumBu
f 5",
both
as
specified on
the
datacomm
configuration
menu.
Refer to
"Choosing Buffer Sizes for Multipoint Configurations", in Section
3,
for information on selecting
the
buffer size.
Additional
header
and
framing
characters
will be added to
the
output
buffers
depending
upon
other
configuration
parameters
specified.
SYN
CHARACTERS.
In
asynchronous
configurations you
can
use
the
~~Ins
SYN" field to
cause
SYN
characters
to
be
inserted
at
the
beginning
of
each
transmission
and
at
1 second
intervals
until
the
end
of
the
transmission.
This
is done
automatically
for
sychronous
con-
figura
tions.
TRANSPARENCY
MODE
(BINARY
OPERATION).
Transparency
mode allows you to
send
and
receive
8-bit
binary
data.
This
allows
the
sending
of
data
bit
patterns
that
might
otherwise
be
interpreted
as
control
characters.
7-37

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