Carol and David,
RE: Your request for knowledge of Sector Pulse commands to search for
    in screening the Jupiter Ops sequences being generated.

	There are several commands which seem to effect whether the AACS
passes sector data to EUV and the other instruments that use it (EPD, MAG
and maybe DDS as well as others?).  I also found an older email that Karen
Deutsch prepared in response to an early query about the sector pulse.
	In addition to the 7FUNC, which is a direct sector pulse command
(which we do not normally see but have to infer from PA calls), the 
main cause of loss of sector pulse is a spin rate transition: dual-to-all,
all-to-dual,etc.  At "hi" spin rate there is no pulse either.  Thruster
Flushings cause the sector pulse to be removed, apparently with a 7FUNC
in the PA while the gyro(?) status is changing.  Etc for the items on
Karen's list.  
	I think the biggest problem in checking for these things in the
sequences being designed for the Jupiter Ops orbits, is being able to
search for all the PA calls, etc, that MIGHT contain these commands/actions.
There are so many situations where s/c sampling from backup devices may
effect the sector pulse.  I confess that we do not feel more than 80% sure
that we know when it happens.  We had an ISA out on it (ISA 1832) but
we did not get closer to an "absolute" answer than that.  
	Please let me know if we can be of further help in defining
the problem.
					Karen
=============================================================================

From:	ZODIAC::GLLSVC::KDEUTSCH     "Karen Deutsch -- SDT -- (818)393-5843" 
						10-AUG-1992 20:55:35.89
To:	ZODIAC::SIMMONS,PFISHER,CPOLANSKY
CC:	KDEUTSCH
Subj:	SCANOPS algorithm for determining if sector data is available

Karen and Paul -
SCANOPS is being modified currently to update its modeling of SEQID, the
on board software that determines whether pointing is calculatable by
the AACS computer.  Without SEQID on, there is no sector data available
to instruments on board and no pointing as part of the down-link telemetry.
(There is also an effect of having the GYROs on even when the star sensor
is closed or off, but I don't know if they are modeling this.)

When the program, that is not currently ready to run, is released at the 
end of this month, the following algorithm will be incorporated.
(This information from Shahram Javidnia.)

7FUNC,SEQ,DIS/ENA		SEQID is disabled or enabled
7SCON				Star scanner shutter power
7SSHW				Star scanner power and shutter power
7GATE				Sets a threshold for autonomous shutoff
7STAR				Changes on-board star catalog

In order for DEQID to properly function, the primary star scanner should be powered, the shutter powered, the high voltage needs to be ON or AUTO, the shutter
AUTO, the automatic calculation of (something, sunlight?) must be below
threshold, and the stars in the current star set must be non-zero and non-
9000 in intensities.  And lastly the SEQID must not have been disabled.
-Karen