3276/78 Emulation Mode
PREPARING YOUR TERMINAL FOR USE
Pre-Installation Preparations
The customer
must
take
the
following steps before
attempting
to
install
an
HP
2625A
into
an
IBM 3270 Display System environment.
•
Have
available
a
host
system
capable
of
communicating
with
a
remote,
BSC
(BiSynchronous Communications) 3276 Control Unit.
• Configure
the
host system to recognize
another
3276 Control Unit.
This
may
involve gen
changes
to
the
host
operating
system, teleprocessing subsystem software, and/or front
end
processor.
You
may
also need to
install
additional
hardware
on
the
host system to
permit
support of a remote BSC 3270 port.
•
Ensure
that
the
modem
link
between
the
host system
and
the
3276 Control
Unit
is opera-
tional. When
HP
modems
are
being used,
HP
will assist
in
verifying
that
the
modems
are
operational.
•
If
possible,
test
the
host configuration
and
the
communications
link
by
running
a
program
on
the
remote 3276 Control Unit. This
is
the
best way to verify
that
the
host
configuration
and
the
communications
link
are
operating correctly.
Cable Connections
No special actions
are
required for connecting
either
power or
the
keyboard to
your
terminal
(see Section 2 of
the
User
Manua!). Section 2 ofthe
User
Manual
also describes
the
procedure
for connecting
the
terminal
to
an
HP
computer over
an
RS-232-C point-to-point cable. See
the
.appropriate
parts
of
this
Reference
Manual
for directions on how to connect
your
terminal
to
the
alternate
peripheral
interface (a subset of HP-IB)
and
the
DSN/Data Link.
External
printers
also connect to
the
terminal
as
previously described.
Supporting IBM
data
communications requires special hardware. Therefore,
the
factory con-
figures
Port
2
as
the
IBM datacomm port. Although you have some flexibility
in
configuring
Port
1,
you
must
always connect
Port
2 to
the
IBM (or IBM-compatible) system.
For
each modem drop,
the
first
terminal
must
be connected to
the
host computer
through
a
modem (or modem bypass cable). Thereafter, subsequent
terminals
are
connected to each
other
in
daisy-chain fashion.
Each
terminal
within
a daisy-chain multipoint line contains a
multipoint
interface.
Two
types
are
available:
•
First
Multipoint Interface. This interface connects
the
first
terminal
in
the
group to
the
modem or
hardwire
cable. The interface operates
in
synchronous mode.
• Synchronous Daisy
Chain
Multipoint Interface. This interface connects successive
termi-
nals
within
a synchronous daisy-chain group.
F-18
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