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camserverd controls more hardware-specific details of the running of the camera. The camserverd.conf file contains the following:

# configuration file for camserverd#


# format is "key   value"

# comments start with `#' and go to end of line

# blank lines are okay

# lines cannot be continued

poll_time          0.05                             # main loop time quantum

sample_time        3.0                              # sample time in seconds

driverpath         /dev/astropci0                   # location of driver

confpath           /rotse/run/etc/                  # .lod files location

lockpath           /rotse/run/cfg/                  # camera driver lockfile path

# boundaries of image subframe for statistical analysis

subframe_xmin      974                              # minimum x-coordinate

subframe_xmax      1074                             # maximum x-coordinate

subframe_ymin      974                              # minimum y-coordinate

subframe_ymax      1074                             # maximum y-coordinate

# boundaries for bias subframe

bias_xmin          2

bias_xmax          4

bias_ymin          4

bias_ymax          2075

Along with the standard daemon settings, we also have a driverpath, confpath and lockpath. The driverpath specifies the location of the ARC camera driver. This is always set to /dev/astropci0. The confpath specifies the location of the DSP files to be loaded into the ARC camera hardware boards. These files should not be altered. The lockpath specifies where to put a lockfile when the camera driver is opened. If the camera readout crashes, this file is not removed. You must reboot the camera computer before removing the lockfile and restarting the daq system. Failure to comply with these instructions will result in a most hideous and painful death.3.1

After each image is read out, camserverd calculates some statistics for the image subframe and the bias subframe, specified above. These statistics include minimum, maximum, standard deviation, mean, and median, and can be a useful diagnostic for image quality and readnoise level.

# FITS header parameters

cdelt              0.0009                           # pixel scale (degrees)

# quality cuts on image subframe

stddev_cut         0.0                              # minimum allowed std. deviation

max_min            30000                            # highest minimum pixel value

# Miscellaneous

docorr             0                                # don't run internal correction

amplifier          1                                # 0=left,1=right,2=both

symlinkpath        /rotse/data/3a1/links/           # location of symlinks

The cdelt header value is for World Coordinate System (WCS) positioning in the fits file. The quality cuts are useful for saving disk space. If all the pixels in the central subframe are near saturation, the image is assumed to be ``bad,'' and only the header is written to disk. The system also calculates the number of saturated pixels in the image which can be a useful quick check of the focus quality. The amplifier variable specifies which amplifier should be used.3.2The readout time for dual-amplifier mode is 3s, but the ghosting of saturated pixels becomes a problem that we have not dealt with yet.

The camserverd system was written to be able to perform dark subtraction and flat fielding of the images in memory before they were written to disk. Unfortunately, this was too great a burden on the camera computer, and caused the system to become unstable. For this reason, docorr should not be turned on. Instead, a symbolic link to each image is put in the symlinkpath, where can find the files and process them automatically, as described in Section 8.2.1.

next up previous contents index
Next: clamd.conf Up: The ROTSE-III Configuration Files Previous: camerad.conf   Contents   Index
Rotse Pager 2003-05-20