.
Remote Programmi*
DEVICE-DEPENDENT
COMMAND SET
~
I
value being used for the next calibration step. For com-
plete information about remote calibration, refer to the
Maintenance section.
Numeric values exceeding
full
scale and negative values
for ohms and AC generate error messages.
3-26.
P3
(Put
User-Defined Message)
Format Explanation
P3<value>
Where <value>
is
a string of
up to 16 ASCII characters.
Example Explanation
"P3FL.8840.12-17-83"
L
o a d s
t
h e m e s
s
a g e
"FL.8840.12-17-83" into Cali-
bration memory.
"P3HIMOM"
Loads
the
message "HIMOM"
into calibration memory. The
remaining eleven characters
we
assumed
to
be
blank.
The P3 command stores
a
user-defined message in the
internal calibration memory during remote calibration. The
message may
be
read
with
a subsequent G3 command.
The message may consist of up to
16
ASCII characters,
and typically represents the instrument's identification,
calibration
date,
calibration
facility,
etc. If fewer
than
16
characters are specified,
spaces
are
appended
to fill the
message to
16
characters.
Spaces
and commas in the
16-character input string are
suppressed.
Lower-case letters
are converted to upper-case.
NOTE
If
fewer than
16
characters are specifid the
P3
command
must
not
be
followed
by
other
corn& in the same input
command
string.
Otherwise, the subsequent
commands
will
be
misinterpreted
as
part of the 16-character
string.
To accept the P3 command, the 8840A must
be
in the
calibration mode (enabled by pressing the front panel
CAL
ENABLE switch). Otherwise, the P3 command will gener-
ate an error message.
3-27.
Rn (Range Commands)
The Range commands duplicate the front panel range
buttons. For example, RO selects autorange, and R4 selects
the
200V1200
kQ
range.
The R7 command turns autorange off, just
as
the
AUTO
button does when it is toggled. Command
R7
puts the
8840A into manual range, selecting whatever range the
instrument is in when the command
is
received.
The 8840A defaults to
RO
on power-up and any &vice-
clear command
(*,
DCL, or SDC). The range setting
can
be
read using
the
GO
command.
3-28.
Sn (Reading Rate Wmmands)
The Reading Rate commands duplicate the front anel
RATE
button. Like the
RATE
button, the reading
i
rate
command
also
selects the number of
digits
displayed; ind
the filter setting. (Filter settings are shown in the
specifications in Section 1).
The
8840A
defaults
to
SO
on power-up and any dwce-
clear
command
(*,
DCL, or SDC). The reading rate
C$m
be
read
using
the GO command.
3-29. Tn (Trigger Mode Commands)
The Trigger Mode commands dupiicate the front
panel
EX
TRIG button.
In
addition, the, commands
can
enabye or
disable
the
rear
panel trigger
and
the
automatic settling
time
delay.
Figure 3-7 illustrates how to selp among the five t
triggers: continuous trigger, fropt panel trigger,
trigger, and two
bus
triggers. Note that the
TRIG
button is enabled only wbiie the
local control.
In the continuous trigger mode
0,
triggers are
initiated
at the selected reading rate. Egch new reading is l&ded
into
the
output buffer
as
it bemmes available,
unles$
the
instrument is busy sending previous output data.
The
trigger
mode
can
be
read uising the
GO
command. The
8840A tiefaults to TO on both power-up and any debce-
clear
command
(*,
DCL,
or
SDC).
I
3-30.
Wn
(Terminator Con)mands)
The Terminator commands select what terminato
the
8840A
appends
to
every
output ,string.
The
available
rmi-
Or
Identify
(EOl).
4
nators are: Carriage Return
(CR),
Line Feed
(LF),
axid
End
I
I
CR
and
LF
are ASCII control codes, sent over the
data
lines
just
like output Qta. EOI
is
a uniline message
hi&
is
sent
simultaneously with the last charader in the
o
tput
string. Normally, each output string
is
terminated wi
CR
followed by
LF
and EOI.
1
The terminator selection
can
t)e
read using the G6
kom-
mand. The 8840A defaults to WO on power-up
and
any
device-clear command.
I
3-31.
XO
(Clear
Error
Register
Command)
The
XO
command clears the 8840A7s error status re
'
ter.
Error Status) would return 1000 (no errors).
T
After an
XO
command is exeauted, a G7 command (Get
Note that the enor
status
register
is
also
cleared
wh4
any
device-clear command
(*,
DCL,
or SDC) is exeduted
However,
XO
is
useful for clearing the error status reqster
without forcing a complete instrument clear
(as
dq, the
device-clear commands).
3-32.
Yn
(Suffii
Commands)
The Suffix commands enable or disable a suffix whicP the
8840A
can append to all nbmeric data (the
dap
in
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