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Table
2-13. Interlace
Mode Commands
COMMAND
DESCRIPTION
COMMAND STATUS
"EM"
Error Mode
1
~
on,
0 =
off
"RM"
Record Mode
1
= on,
0
=
off
"TM"
Select Terminator
1
= CR, 0 =
LF
"UM"
Unbuffered
Mode
1
=
on, 0
s
off
"VM"
Valid
Mode
1
=
on,
0
-
off
The
error
mode
selects
when
the
IEEE-488
rejected
entry
status
is
cleared.
If
turned
on, the
error status
is
cleared
when
a
new
message
is
processed.
If
turned
off,
the
status
is
cleared
only
when
interrogated
with
the
"IR"
(interrogate rejected entry)
command
or
when
explicitly
cleared
with the
"CE"
(clear
error
command).
The
record
mode
selects
whether
the
message
unit
is
a record or
a
command.
When
turned
on,
the
message
unit
is
a
record.
When
turned
off,
the
message
unit
is
a
command.
The
terminator
mode
selects
the character
used
as
the
record terminator.
The
terminator
character
is
not used
for
command
processing unless the record
mode
is
enabled.
When
turned
on, the
record
terminator
CR
(carriage return)
is
used.
If
turned
off,
the record
terminator
LF
(line
feed)
is
used.
The
record terminator character
is
the
last
character
in
all
IEEE-488
messages
sent
from
the Generator.
The
unbuffered
mode
selects
when
messages
from
the
IEEE-488
interface are processed.
When
turned
on,
messages
are
read
from
the
IEEE-488
interface
only
when
the
microprocessor
is
ready
to
process
them.
In
this
mode,
the input buffer
will
contain
a
maximum
of
one
message.
(A message
may
be
one
command
or
one
record,
depending on
the
setting
of
the
record
mode.)
When
turned
off,
messages
are read
from
the
IEEE-488
Interface to the input buffer of the
Generator
at
the
fastest
rate.
In
this
mode,
the
input buffer
may
contain
up
to
80
characters.
The
valid
mode
selects
when
messages
are
processed
by
the
Generator
microprocessor.
When
the valid
mode
is
turned
on, processing of a
new
message
is
begun
only
after
the
RF
output has
settled
and
become
valid.
When
the
valid
mode
is
turned
off,
a
new
message
is
processed
immediately
after
the
completion
of the previous
message.
The
interface
modes
can
also
be
programmed
using
the
command,
"(5)"
n (where
n
is
an
integer).
The
interface
modes
are
set
to
the
value of
n,
where
n
is
the
sum
of
the
codes
for
the
desired
modes.
The
integer
codes
for
the interface
modes
that
can be
programmed
using
the
n
commands
are
as follows:
Terminator
Mode=
I
Record
Mode
=
2
Valid
Mode
=
4
Unbuffered
Mode=
8
Error
Mode
= 16
For example,
to
select
the record
mode
and
valid
mode,
the
command
is
6.
Interface
Mode
Example:
In
this
example,
the
RF
output
of the
Generator
is
connected
to
a
circuit
that
is
being
measured by
a
voltmeter.
The
output of the Generator
must
be
settled
before the
voltmeter
is
given
the
command
to
make
a
measurement.
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