SYS> autoxy xxx yyy
Issue the FIELD command on the TCS User Interface
USER> field
and wait for the star to appear during raster scans. If the star is very
faint allow several scans to ensure that the autoguider is seeing a
real star and not just scan noise (cursor jumping randomly after each
scan). The autoguider raster scan is 2 arcmin square with 5 arcsec
pixels.
USER> acq
The star is scanned in a maltese cross and attempts are made to
acquire the star. The probes are moved to centre the star in the scan
and a "NEW FIELD" message appears. If attempts to pull in the star
for guiding are successful, the profiles of the star will be
displayed, and the message "OK TO GUIDE" will appear.
Note that one can use
USER> acquire tel
to move the telescope rather than the probes to centre the guide star.
USER> guide
and wait a few seconds for the tracking cursor to appear within the
seeing disk below the field raster display, then finally....
USER> autoguide on
THE GUIDING LOOP IS NOW CLOSED
During autoguiding, if the star is lost for any reason (e.g. cloud) as
signified by a "CLOUDY" message and the tracking cursor leaves the
seeing circle and takes wild random jumps, then immediately press F17
(or AUTOGUIDE OFF), and re-acquire as above.
When going to a different source use
USER> autoguide off
USER> agstop
to disable the guide loop and to stop the guider. If you want to
resume guiding after issuing the AGSTOP command, you will have to do
the FIELD-ACQUIRE-GUIDE sequence again.
If autoguider freezes, then power off-on, then re-acquire.