THE
DATA
MESSAGE
(Function Select Commands)
(contl
DATA
TRANSFER MODE. There are 2 HP-IB data
transfer
modes: Unbuffered and
Buffered.
At
turn
-on, the
3314A
data transfer mode is
unbuffered.
As each
com-
mand is accepted by the
3314A,
it
is executed. The
next
byte
of
HP-IB
informa-
tion
cannot
be accepted
until
the
previous command has been processed. The se-
cond
mode loads up
to
96
bytes
of
HP-IB data
into
a
buffer.
When the EOS (End
of
String) character is received,
the
3314A
starts
to
process
the
commands
in
the
order
they
were
received. The
maximum
data rate in
the
buffered mode is
3ms
per
character.
DISPLAY ERRORS. All errors are displayed
for
about
1/2
second immediately
after
they
are
detected
. While
they
are displayed, no
other
programming can occur.
MANUAL
SWEEP. Manual
Sweep
can be turned ON and OFF via
the
HP-IB,
however,
the
real
importance
of
Manual Sweep is in
the
local operating mode.
Manual
Sweep
Frequency
cannot
be set via the HP-IB.
PLL
MASK.
Bit -5
of
the
Status
Byte
is maskable. Depending upon
the
mask, and
the
state
of
the PLL (phase locked loop),
bit
5
will
be
set
(1) or reset (0). Before
bit
# 5
will
be set,
both
the
Status
Byte mask and
the
PLL mask
must
be set.
94
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