HP 54501A - Program Message Terminator

Program
Message
Terminator
Character
Program
Data.
Character
program
data
is
used to
convey
parameter
information
as
alpha
or
alphanumeric strings.
For
example,
the
timebase
command
MODE
can
be
set
to
auto,
trigger,
or
single.
The
character
program
data
in
this
case
may
be
AUTO,
TRIGGER,
or
SINGLE.
:TIMEBASE:MODE
SINGLE
sets the
timebase
mode to
single.
Numeric
Program Data.
Some
command
headers
require
program
data
to
be
a
number.
For
example,
:TIMEBASE:RANGE
requires
the
desired
full
scale
range
to
be
expressed
numerically.
The
instrument
recognizes
integers,
real
numbers,
and
scientific
notation. For
more
information
see
the
chapter
"Message
Communication
and
System
Functions."
The
program
codes
within a
data
message are
executed
after
the
program
message terminator
is
received.
The
terminator
may
be
either
an
NL
(New
Line)
character, an
EOI
(End-Or-Identify)
asserted,
or
a
combination
of
the
two.
All
three
ways are
equivalent
with
the
exact
encodings
for
the
program
terminators
listed in
the
chapter
"Message
Communication
and
System
Functions."
Asserting
the
EOI sets
the
EOI
control
line
low
on
the last
byte
of
the
data
message.
The
NL
character
is
an
ASCII linefeed
(decimal
10).
Note
The
NL
(New
Line)
terminator
has
the
same
function
as
an
EOS
(End Of String)
and
EOT
(End Of
Text)
terminator.
HP
54501
A
Programming
Introduction
to
Programming
an
Oscilloscope
1-9