CCDs

Local> C AAT40A
... connect to VAX 4000
Username: OBSERVER
... login
$ CCD_ n
where n = 1 or 2, specifying controller. This creates OBSERVER CCD_n display on terminal.
Idle: WINDOW windowname
TEK1K_SETUP 121 x 1024, central columns; for UCLES setup.
THOMSON_CENTRE 300 x 300, central square; for UCLES setup.
TEK1K_SX2 (512+13) x 1024; binned x 2 along slit; usual for UCLES.
TEK1K_DIRECT (1024+26) x 1024
UHRF_X4 spatial binning x4 (256+4) x 1024
UHRF_X8 spatial binning x8 (128+4) x 1024
... or can customize any other file.WINDOW, and point to the full directory and file specification in the WINDOW command. Follow examples in window_dir or in AAO UM 17.1. View window characteristics by logging in to NIGHT account and running the program $ PGWINDOW.
: SPEED SLOW
or XTRASLOW, NORMAL, FAST, or NONASTRO. Higher speeds introduce greater readout noise, so the correct choice depends on the anticipated count rate. See Section .
: COLOUR GRAY
... or CONTOUR, FALSE, GREY, or GRJT. Set greyscale for XMEM display. GRAY turns red for pixels where ADC saturated, i.e. = 65535 ADU.
: TIME t
... set default exposure time to be t seconds.
: GLANCE [t]
[t second] exposure; XMEM storage only, unless do KEEP GLANCE.
: DUMMY [t]
[n second] exposure; store in DISK$DATA:[CCD_ n.yymmdd ] l .DST, a.k.a. /vaxdata/ccd_ n / yymmdd / l .dst unless do KEEP l.
: RUN [t]
[t second] exposure; store in DISK$INST:[CCD_ n.yymmdd ] ddmmmnnnn .DST, a.k.a. /vaxinst/ccd_ n / yymmdd / ddmmmnnn .dst
: DARK [t]
[t second] exposure with slit shutter closed
: BIAS
0 seconds with slit shutter closed
: REPEAT [n]
cycle indefinitely [ or n times in total (not n times more) ].
: SINGLE
end REPEAT mode.
: OBJECT objectname etc
for header; can be done during exposure and/or readout
: HOLD
close slit shutter and pause timer
: CONTINUE
continue paused exposure
: STOP
terminate exposure, readout CCD
: ABORT
terminate exposure or readout, trash data
: CTRL/P or CTRL/N
Scrolls previous/next message window
: SHOW
CCD technical data.
: ENDSHOW
Return to normal operating screen.
: RECOVER XMEM
Attempt to recover from error.
: RECOVER CCD
Attempt to recover from error.
: RESET
Clear system
: RESET HARD
Clear system, including CCD & microcode
: EXIT
Exit at end of night, returning to DCL
$ LOGOUT
At end of night; new directory has to be created for next night

DRT (data recording task) warnings concern the available diskspace, etc.