HP 54501A - Section 6 Service; 6-1. Introduction; 6-2. Safety Considerations; 6-4. Block Level Theory of Operation

<
program
header
separator
>.
A
space
(ASCII
decimal
32)
separates
the
header
from the
first
or
only
parameter
of the
command.
<wh
i
te
space>
Figure
3-17.
<
program
header
separator>
<
program
message
terminator
>.
The
<
program
message terminator
>
or
<
PMT
>
serves
as
the
terminator to
a complete
<
program
message
>.
When
the
parser
sees
a complete
<
program
message
>
it
will begin
execution
of
the
commands
within
that
message.
The
<
PMT
>
also
resets
the
parser
to
the
root
of
the
command
tree.
X
——»-
\
.
/
While
<
NL>
is
defined
as
a single
ASCII-encodcd
byte
OA (10
decimal).
Figure
3-18.
<
program
message terminator
>
HP
54501A
Programming
Message
Communication
and
System Functions
3-19