Tektronix FG 5010 User Manual

Programming -
FG
5010
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 ( WBYTE @ A , 1 :)
Only instruments that are listen - addressed respond to
GTL
by
changing to a local
state .
Remote - to - local
transi
tions caused by GTL do not affect the execution of the mes
sage
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 ( rt
) . This tran
sition
may occur
during
message execution
; but , in
contrast
to GTL and REN transitions , a transition initiated by rtl 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 change only
the display ( such as INST ID ) do not affect the remote - local
states - only front panel controls that change settings as
sert rtl . The rtl message remains asserted while multiple
keystroke
settings
are entered
, and it
is unasserte
after the
execution of the settings . Since rtl prevents transition to
REMS , the instrument unasserts rt / if a multiple button se
quence
is not
completed in a
reasonable length
of time ( ap
proximately 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 caused by commands . Instrument settings are un
affected by transitions among the four remote - local states .
The REMOTE indicator is lighted when the instrument is in
REMS or RWLS .
Local
State
(
LOCS )
In LOCS , instrument settings are controlled by the opera
tor via front panel pushbuttons . When in LOCS , only bus
commands that do not change instrument settings are ex
ecuted ( query - output commands ) . All other bus commands
(
setting
and
operational )
generate an error
since those
func
tions are under front panel control .
Local Without Lockout State ( LWLS )
The instrument operates the same as it does in LOCS ,
except that rtl will not inhibit a transition to remote .
3-30
Remote State ( REMS )
In
this
state , the
instrument
executes
all
instrument com
mands
. For
commands having
associated
front panel indica
tors
, the front
panel
is updated
when the
commands
are
executed
.
Remote With Lockout State ( RWLS )
Instrument operation is similar to REMS operation ex
cept
that
the rt /
message is
ignored
. ( The front
panel
is
locked
out . )
STATUS AND
ERROR REPORTING
Through
the
Service
Request
function (
defined in
the
IEEE
- 488
Standard ) , the
instrument may
alert the
controller
that it requires service . This service request is also a means
of
indicating that
an event ( a
change in status
or an error )
has occurred . To service a request , the controller performs
a
Serial
Poll . In
response
, the
instrument
returns a
Status
Byte
( STB ) , which
indicates
whether it was
requesting ser
vice
or not
. The STB
can also
provide a
limited
amount of
information about
the
request . The
format of the
information
encoded in the STB is given in Fig . 3-5 . Note that , when
data
bit 8 is set
, the STB
conveys Device
Status
informa
tion , which is contained in bits 1 through 4 .
Because the
STB
conveys
limited
information
about an
event
, the
events are
divided into
classes ; the
Status
Byte
reports
the
class . The
classes
of
events are
defined as
follows
:
COMMAND ERROR — Indicates that the instrument has re
ceived a command that it cannot
understand .
EXECUTION
ERROR
INTERNAL
ERROR
SYSTEM
EVENTS
EXECUTION
WARNING
INTERNAL
WARNING
-Indicates tha
the
instrument has re
ceived
a
command that it
cannot
execute
. (
This
is
caused
by out
of
range
arguments
or
settings
that
conflict . )
-
Indicates that
the
instrument has
detected a
hardware
condition or
firmware problem that prevents
operation .
-Events that
are common
to instru
ments in a
system (
e.g. ,
Power On ,
User Request , etc. ) .
-Indicates that the instrument is op
erating
,
but that
the user
should
be
aware of
potential
problems .
Indicates that the instrument has
detected a
problem ( e.g. , out
of cali
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Tektronix FG 5010 Specifications

General

Brand	Tektronix
Model	FG 5010
Category	Portable Generator
Language	English