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HP 3336A - Page 48

HP 3336A
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S
Model
3336A/B/C
These
front
panel
controls
or
operations
are
NOT
available
to
the
HP-IB
programmer:
—Afx2
—display
BUS
ADDRESS
—Af-—2
—all
controls
in
the
Modify
Group
—MKR-CF
—CLEAR
display
These
HP-IB
operations
are
NOT
available
from
the
front
panel:
—Data
Transfer
Mode
Selection
—Service
Request
Masking
—lInterrogration
of
Programming
Errors
3-154.
Data
Transfer
Mode
Selection.
The
-hp-
3336
accepts
Data
Messages
in
one
of
two
Data
Transfer
Modes.
a.
Data
Transfer
Mode
|.
The
-hp-
3336
is
in
Data
Transfer
Mode
|
at
turn-on
and
while
in
this
mode,
each
Instrument
Programming
Code
is
processed
when
received.
That
is,
the
instrument
immediately
performs
the
instruction.
The
-hp-
3336
can
NOT
receive
another
character
until
the
instrument
has
completely
performed
the
previous
instruction.
The
time
required
to
transfer
data
has
been
extended
by
the
time
-hp-
3336
takes
to
perform
the
in-
struction.
The
advantage
of
Mode
1
is
that
it
is
less
complicated
to
use
but
as
your
system
sophistication
increases,
the
advantage
of
faster
programming
time
makes
Data
Transfer
Mode
2
important.
b.
Data
Transfer
Mode
2.
The
-hp-
3336
accepts
and
stores
a
string
of
Program
Instruc-
tion
Codes
in
an
internal
buffer
when
it
is
in
Data
Transfer
Mode
2.
These
codes
are
NOT
processed
until
the
buffer
is
full
(48
characters)
or
the
EOS
(End
of
String)
character
is
received.
The
advantage
of
Data
Transfer
Mode
2
is
that
after
a
string
of
instructions
is
sent
to
the
-hp-
3336,
at
the
fastest
rate
the
instrument
can
accept
them
(150-200
usec
per
character),
communication
can
take
place
between
other
devices
on
the
bus.
A
‘‘Busy’’
flag,
encoded
into
bit
7
of
the
Status
Byte,
indicates
when
the
instrument
is
‘‘Busy’’
processing
a
string
of
instructions.
The
instrument
can
NOT
accept
Data
Messages
during
the
time
it
is
“*Busy’’.
If
a
string
longer
than
48
characters
is
sent,
the
instrument
will
‘“‘hold
up’’
the
bus
until
the
first
48
characters
are
processed
and
the
remaining
characters
are
accepted.
Therefore,
to
realize
the
maximum
effectiveness,
a
program
string
longer
than
48
characters
should
be
divided
and
an
EOS
character
sent
after
(or
at
a
convenient
place
before)
the
48th
character.
Data
Transfer
Mode
2
must
be
remotely
programmed.
The
instrument
will
re-
main
in
Mode
2
until
Mode
1
is
programmed
or
the
POWER
switch
is
set
to
STBY.
Operation
3-27

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