PU
type
2.1
The
PU
type
2.1
is
the
physical
unit
type
that
is
required
for
an
LU
6.2
(see
LU
type
description
following).
Examples
of
PU
type
2.1
is
an
IBM
3820,
IBM
3935,
or
PSF/2.
Summary
of
LU
Types
and
Representative
IBM
Products
Listed
below
are
the
LU
types
that
SNA
currently
defines
and
the
kind
of
configuration
or
application
that
each
type
represents.
Also
mentioned
are
hardware
or
software
products
that
typically
use
each
type
of
logical
unit.
A
logical
unit
(LU)
describes
the
type
of
relationship
that
the
Host
VTAM
and
applications
have
with
a
specific
device
such
as
a
printer.
This
relationship
determines
the
commands
supported
from
the
host
to
the
device
and
the
type
of
feedback
the
device
gives
to
the
host.
LU
type
0
LU
type
0
printers
are
Non-SNA
Local
or
Bisync
connections.
This
mode
is
also
commonly
called
DSC
(Data
Stream
Compatibility)
mode
printing.
An
example
of
an
LU
0
printer
connection
is
an
IBM
3816
attached
to
a
non-SNA
3174
control
unit.
Not
all
printers
support
this
type
connection.
This
connection
type
is
used
when
VTAM
is
controlling
the
non-SNA
control
unit
and
device.
LU
type
1
An
LU
type
1
is
for
an
application
program
that
communicates
with
single
or
multiple-device
data
processing
workstations
in
an
interactive,
batch
data
transfer,
or
distributed
data
processing
environment.
The
data
stream
conforms
to
the
SNA
Character
String
(SCS)
or
Document
Content
Architecture
(DCA).
Examples
of
printers
that
are
able
to
communicate
via
LU1
are
4230,
4234,
3930,
6500–v
and
others.
LU
type
1
is
the
basic
logical
unit
type
for
SCS,
IPDS,
and
AFPDS
(PSF)
printing.
The
type
of
connection
is
determined
by
the
application
that
will
be
driving
the
printer.
The
selection
is
made
by
changes
in
the
VTAM
logmode
entry
that
is
used
for
the
logical
unit.
See
the
examples
for
the
type
of
connection
desired.
LU
type
2
LU
type
2
is
use
by
an
application
program
that
communicates
with
a
single
display
workstation
in
an
interactive
environment,
using
the
SNA
3270
data
stream.
Type
2
LU’s
also
use
the
SNA
3270
data
stream
for
file
transfer.
An
example
of
an
LU
type
2
device
is
a
3270
display
such
as
a
3278,
3178,
and
others.
Appendix
D.
Attaching
Host
Systems
to
a
Coax/Twinax
Printer
285
Содержание 6500-V10 - InfoPrint 6500 Model v10 B/W Line-matrix Printer
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