Programming—DM 5010
The talker function goes to its idle state when the instru
ment receives the
UNT command. In this state, the instru
ment cannot output data via the GPIB.
The ADDRESSED
light is off when both the talker and
listener functions are idle. If the
instrument is either talk ad
dressed or listen addressed, the light is on.
IFC—Interface
Clear (GPIB pin
9)
This
uniline
message has the same effect as both the
UNT and UNL
messages.
The front panel ADDRESSED
light
is
off.
DCL
—Device Clear (20 with
ATN)
The Device Clear
message reinitializes communication
between the
instrument and controller.
In response to DCL,
the
instrument clears
any input and output messages and
any
unexecuted
settings
in the Pending Settings Buffer.
Also cleared are any errors or events waiting to
be reported,
except the
power-on
event.
If the
SRQ line is asserted for
any reason other than power-on
when DCL is
received, the
SRQ is unasserted.
SDC
—Selected Device Clear (4 with ATN)
This
message performs the same function as DCL; how
ever,
only instruments that
are
listen addressed
respond
to
SDC.
GET
—Group Execute Trigger (8 with ATN)
The
instrument
responds to <GET> only if it is listen
addressed and
the instrument device trigger function has
been
enabled by the Device Trigger
command (DT). The
<GET>
message is ignored and
an SRQ generated if the
DT
function
is disabled (DT OFF), tne instrument is in the
local state, or
if a
message
is being processed when
<GET>
is received.
SPE—
Serial Poll Enable (24 with
ATN)
SPD—Serial Poll Disable (25 with
ATN)
The
SPE
message enables the instrument to output
serial
poll status
bytes when it
is talk addressed. The SPD
message switches
the instrument back to its normal oper
ation of sending
the
data from the Output Buffer.
MLA
—My
Listen Address
MTA
—My
Talk Address
The
primary
listen
and talk addresses are established by
the
instruments GPIB
address (internally set). The current
setting
of the GPIB
address is displayed on the front panel
when the
ID
button is pressed. When the instrument is ad
dressed to talk or listen, the front panel ADDRESSED indi
cator is
illuminated.
LLO
—Local Lockout (17 with
ATN)
In response
to LLO, the instrument goes to a lockout
state—
from LOGS to LWLS or from
REMS to RWLS.
REN—Remote
Enable
If REN is
true, the instrument
goes to a remote state
(from LOCS
to REMS or from LWLS to RWLS) when its
listen
address is
received. REN false
causes a transition
from any state to
LOCS; the
instrument stays
in LOCS as
long
as REN
is false.
A
REN
transition may occur after
message processing
has
begun.
In this
case, execution of the message being
processed
is not
affected by a transition.
GTL
—Go To Local (1 with
ATN)
Only
instruments that are listen addressed respond to
GTL by going to a local
state. Remote-to-local transitions
caused by
GTL do not affect the execution of the message
being
processed when
GTL was received.
Remote-Local
Operation
The preceding discussion of interface
messages de
scribes
the
state transitions caused by GTL and REN. Most
front panel controls cause a transition from
REMS to LOCS
by
asserting
a message
called return-to-local
(rtl).
This
tran
sition may occur during message
execution; but in contrast
to
GTL and REN transitions, a transition
initiated by ft! does
affect
message execution.
In this case, the instrument gen
erates
an error if there are any unexecuted
setting
or
oper
ational
commands.
Front panel controls that only change
the
display
(like
INST ID) do not affect the
remote-local
states—only front
panei controls that change settings as
sert
rtl.
The
rtl
message remains asserted while multiple
keystroke
settings are entered: and it is unasserted after
the
execution of the settings.
Since
rtl
prevents transitions
to
REMS, the instrument unasserts
rtl
if
a
multiple button
sequence
is
not completed in a reasonable length of time
(approximately
5 to 10
seconds).
The instrument
maintains a record of its settings in the
Current
Settings Buffer and
new settings from the front
panel
or the controller update these recorded settings. In
addition,
the
front panel is updated to reflect setting
changes
due to commands. Instrument settings are unaf
fected
by transitions between the
four remote-local states.
The REMOTE
indicator is illuminated when the instrument is
in REMS or RWLS.
3-23
Summary of Contents for DM 5010
Page 14: ...DM 5010 2994 00 DM 5010 Programmable Digital Multimeter xii ADD JUL 1986...
Page 27: ...Operating Instructions DM 5010 2994 03 Fig 2 3 DM 5010 front panel controls and connectors 2 3...
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Page 251: ...Section 8 DM 5010 OPTIONS No options are available 8 1...
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Page 272: ...DM 5010 2994 37 Fig 10 2 Location of DM 5010 adjustments and test points...
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Page 337: ...63 REV JUN 1986...
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