•
•
•
MESSAGE
DATA
TRIGGER
CLEAR
REMOTE
LOCAL
LOCAL
and
CLEAR
LOCKOUT
LOCAL
LOCKOUT
SERVICE
REQUEST
STATUS
BYTE
Table 3-6. Meta Messages
DESCRIPTION/RESPONSE
A means
to
send device
dependent
com-
mand and receive measurement data.
HP-IB: IUNL,
MTA,
LADn, datal
HP-Il:
IUNL, MTA, LADn, SDA, datal
Starts
a new measurement.
Will clear
the
display. If in
error
state,
clears
error
only.
IUNL, MTA, LADn, SDCI
Disables
front
panel
keys
(except
for
Reset/Local).
IREN,
UNL, MTA, LADnl
Enables
the
front
panel
keys.
IUNL, MTA, LADn, GTLI
Enables the
front
panel
keys
and clears
local
lockout.
HP-IB: I
REN
I
HP-Il:
I
NRE
I
Disables
the
Reset/local key
when
in
remote.
ILLOI
This command
is
ignored when received
by
the instrument. It will be sent by
the
instrument
when
an
enabled service
condition
is
present.
Presents status information.
HP-IB:
I
UNL,
MLA,
TADn, SPE,data,SPD, UNTI
HP-Il:
IUNL, MLA,TADn,
SST,
data, UNTI
STATUS
Single
bit
parallel
poll
response indicates
BIT
whether
this instrument
is
requesting
service.
I IDYl
PASS
Not
supported.
CONTROL
ABORT Terminates bus communications by
unlistening and
untalking
all instruments.
IIFCi
DEVICE
Causes
the
instrument
to
send
the
string
ID
"HP
5384A"
or
"HP
5385A"
IUNL,
MLA,
TADn, SDI, datal
ACCESSORY
Causes
the
instrument
to
send
the
num-
ID
ber
81
in binary. This identifies
the
instru-
ment
as
a measuring instrument.
IUNL,
MLA,
TADn, SAl, datal
3-129. Table
3-7lists
the
meta
messages
and
the
HP
9825, HP-85,
and
HP-41C
commands
that
correspond
to
them.
(Only
the
addressed
form
is
shown
for
the
commands
that
support
both
the
unaddressed
and
addressed
forms.
The
HP-41C
requires
the
address
selection
to
be
made
using a
SELECT
statement.)
The
table
assumes
the
instrument
is
set
to
address
03
and
the
interface
to
select
code
7.
HP
5384A
and
HP
5385A
~!j";jfi'.
Opecadon
and
Pcogcamming "
Table
3-7.
Meta Messages
and
Controller
Commands
MESSAGE
HP
9825 HP-85
HP-41C
DATA
wrt
703,
A$ OUTPUT OUTA
703;
A$
red
703,
A$
ENTER
INA
703;
A$
TRIGGER trg
703
TRIGGER
703
TRIGGER
CLEAR
clr
703
CLEAR
703
REMOTE
rem
703
REMOTE
703
REMOTE
LOCAL lei
703
LOCAL
703
LOCAL
LOCAL/
lei 7
LOCAL7
CLEAR
LOCKOUT
LOCKOUT llo
7 LOCAL
LOCKOUT
7
SERVICE
STATUS
REQUEST
7,1; A
STATUS
rds
(703)
SPOLL
(703)
INSTAT
BYTE
*STATUS
PPOLL
(7)
BIT
PASS
CONTROL
ABORT
eli
7 ABORTIO 7
STOPIO
*DEVICE
SEND
7;
FINDID
ID
CMD
255
*ACCESSORY
SEND
7;
ID
CMD
254
*HP-Il
only.
Typically,
HP-Il
uses
an
address code
of
9nn and HP-IB
uses
an
address code
of
7nn.
3-130. SRQ, SRQ MASK, AND STATUS
BYTE
3-131. SRQ and Status Byte
3-132.
When
in
remote
operation,
the
counter
can
send
a service
request
(SRQ)
to
the
controller
to
indicate
the
need
for
attention
and
can
act
as an
interrupt
to
the
current
sequence
of
events. Typically,
SRQ
indicates
data
is
ready
to
transmit
and/or
an
error
condition
exists. The
counter
can
send
an
SRQ
to
the
controller
under
any, all,
or
none
of
the
following
conditions,
as
defined
by
the
Service
Request
Mask.
The
Service
Request
Mask
(SM
com-
mand)
must
be
set
prior
to
the
condition.
Refer
to
paragraph
3-136.
a.
DATA
READY.
A
measurement
has
been
com-
pleted
and
is
available for
collection.
b. ERROR. An Error
or
Failure
condition
exists,
and
is
displayed.
c.
LOCAL.
The
instrument
is
in local.
3-15
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