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Figure
2-6.
6062A
IEEE-488
Bus Connected
to
a
6062A
IEEE-488
Bus
If
the listen-only
mode
is
selected,
the
Generator
is
always addressed
to
listen,
and
the front
panel
ADDR
indicator
is
always
lit.
The
Generator
listens
and
responds
to
all
data messages
on
the
IEEE-488
Interface.
The
response
to
data messages
is
the
same
as in
the
addressed
mode
of operation
except
that requests for talker
output
are ignored.
In
the listen-only
mode,
the
talker,
remote/local,
service request, device
clear,
and
device
trigger interface
functions
do
not
apply.
2-50.
Command
Syntax
The
Generator
IEEE-488
bus
commands
alphabet
consists
of
the
letters
A
through
Z
(upper
and lower
case
letters
are treated equally),
digits
0
through
9,
and
the
following
special
characters:
@
.
,
;
+
-
CR
LF
Spaces, tabs characters,
and
the parity
bit
are ignored.
The IEEE-488
commands
for the
Generator
consist of the
following three
parts:
Header
Numeric
Suffix
The
header
is
always
required, but the
numeric and
suffix
may
be
optional.
This
rule gives
the
following four possible combinations:
(HEADER)
(HEADER) (NUMERIC)
(HEADER) (NUMERIC)
SUFFIX)
(HEADER)
(SUFFIX)
M
ultiple
commands may
be separated with
one
of the
end
of
string
(EOS)
characters
or
Use
of
EOS
characters
facilitates
recovery
in
the event of a syntax
error
and
will
also
enhance
readability.
2-51.
COMMAND
HEADER SYNTAX
The
command
header
is
a
two
alpha-character
string.
A
list
of the
IEEE-488
command
headers
used
on
the
Generator
is
presented
in
Table
2-8.
The
header determines
the
syntax
of the
numeric and
suffix as
listed
in
the
table.
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