Model
8642A/B
Appendix
B
Appendix
B:
WRITING
MESSAGES
TO
THE
DISPLA
Y
You
can
write
messages to
the
Signal
Genera
tor's display using service special
functions
and
ASCII
character
cocks. Two, separate,
49-character
message strings
can
be easily displayed on
the
front
panel
or
read
via
HP-IB.
Messages
such
as these could be useful, for example,
when
keeping
track
of
calibration
times,
or
the
owner
of
the
instrument,
or
special
calibration
informa
tlOn. Also,
when
testing
instruments,
a message could be used as a system
prompt.
These
messages
are
battery-backed
up
and
can
be stored
through
power off, to be
read
any
time.
Service Special
Functions
653
through
659
manipulate
message
1,
Special
Functions
663
through
669
manipulate
message
2.
Note
that
accessing service special
functions
is
dIfferent
than
accessing
the
user
special
functions
discussed previously
in
this
manual.
To select user special
functions,
you
key
in SPCL ( (
SHIFT
1 0 )
and
then
the
special
function
number.
(For
HP-IE,
use
the
example on page
3-202.)
To select service special
functions
locally,
you
need
to follow
two
steps:
1)
First
select
user
Special
Function
3,
Service Mode,
with
keystrokes
SPCL ( (
SHIFT
1 0 )
r;jJ.
Once
you
enter
the
servIce mode
you
can
access
the
actual
service special functions.
However,
you
can
only
key
in
numbers
and
terminators;
selecting
any
other
key
will cause
the
instrument
to exit
this
special mode
and
display
current
instrument
settings.
2)
After
you
enter
the
service mode, you
can
select
the
service special
function
number.
However,
the
instrument
only
knows
that
you
have selected a special
function
when
you
key
in
the
CBTPVJ
terminator.
For
example,
to
clear
the
CUITent message
in
message
1,
you
would
key
in
[]]
[]]
rn
(
HZ
ov
)
Table
3-30
on page
3-203
lists
the
special
functions
that
apply
to
both
message 1
and
message
2.
Ta
ble 3 -
31
on page 3
--
2 03 provides a list
of
valid
ASCII
character
codes. Page
3-
2 04 lists
messages
that
might
appear
when
manipulating
the
user-defined
messages.
Example
of
Entering
a
User-Defined
Message
Via
the
Front
Panel
Keys
Select
the
keys
in
the
example below
to
write
a
brief
message to
the
display
Note
that
if
you
accidentally
select
another
key
and
exit
t he service mode, you will need
to
re
-select
Special
Function
3
(SpeL,
(
SHIFT
lOrn)
in
order
to
continue
entering
the
message.
SPCL ( (
sHIFT
) ( - J
rn)
[]]
m
rn
CBTPVJ
(6:1
m
[]J
CD
rn
CRTDV]
(6]
m m
CD
m
(t1TUV]
C2.J
m m m
rn
CRTUV-)
C[J
m
C[J
rn
m I
HZ
OV
I
c[]
rn
rn
rn
m
CBT1JYl
(6)
m
(]J
CD
(-2)
C8....Z3IVJ
IT]
C-S]
[]J
m
[QJ
(HZ
OV
I
rn
m
CD
CF!Z]JV]
3-201
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