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MOSCA SEQUENCER Command Reference

MOSCA/FASU Commands
BIAS Commands
Auxiliary Commands

MOSCA/FASU spectrograph commands (mosca.command in scripts)
(if used with option "-d" extended debugging information is written to the log):

All these commands will actively check that the element has arrived at the requested position. If not, an error will be written to the Talker log and the command sets the return code to a non-zero number.

  • fasua [-d] n
    Move FASU wheel A to position 'n', where 'n' is [0-6]
  • fasub [-d] n
    Move FASU wheel B to position 'n', where 'n' is [0-6]
  • wait_fasu_ready [-d]
    Waits until both the FASU A and FASU B filter wheels are ready (i.e. not moving). If the wheels has not become ready after 90 seconds, a time-out error will occur.

MOSCA CCD commands (mosca.command in scripts)
(if used with option "-d" extended debugging information is written to the log):

  • teloffset n m
    Offsets an object on the CCD in the X,Y direction by the amount n in the X direction and m in the Y direction. N,m is given in arcseconds.
  • abort [-d]
    Aborts an ongoing exposure (see also expose).
  • addtime [-d] nn
    Adds 'nn' seconds to an ongoing exposure (note that 'nn' can be negative too).
  • ampl [-d] x
    Sets the active amplifier to x. Valid values are A, B, AB, C, AC.
  • autosave_off [-d]
    Turns off autosave.
  • autosave_on [-d]
    Turns on autosave.
  • bin [-d] n
    Stes the binning factor in both X and Y directions to n.
  • xbin [-d] n
    Sets the binning factor in the X direction to n.
  • ybin [-d] n
    Sets the binning factor in the Y direction to n.
  • comment [-d] text
    Sets the value of the FITS keyword COMMENT to "text".
    If the text contains spaces it MUST be quoted with double quotes (like this: "text"). Will be cleared after each image.
  • comment1 [-d] text
    Sets the value of the FITS keyword COMMENT to "text".
    If the text contains spaces it MUST be quoted with double quotes (like this: "text"). Will not be cleared after each image.
  • dark [-d][-t][-f] tt
    Makes an dark exposure of tt seconds. To abort the exposure press "Control-C".
    If the '-f' option is used, the command will finish (i.e. the prompt return) when the exposure is finished and the readout begins.
    If the '-t' option is used, a simulated exposure is made. This is usefull for script testing.
  • expose [-d][-t][-f] tt
    Makes an exposure of tt seconds. To abort the exposure press "Control-C".
    If the '-f' option is used, the command will finish (i.e. the prompt return) when the exposure is finished and the readout begins.
    If the exposure time is larger than 300 seconds, the time left until the rotator reaches its limit will be checked. If there is not time enough to complete the exposure, an error will be generated and the exposure will not start.
    If the '-t' option is used, a simulated exposure is made. This is usefull for script testing. This command checks if FASU is ready before beginning the exposure. If 90 seconds occurs and it is not ready, this command will time out.
  • mosca.exit [-d]
    Exits the MOSCA BIAS program. Do not type "exit" as this will close the xterm.
  • filename [-d] nn
    Sets the default filename to nn. Has to be 4 characters.
  • filenamestd [-d]
    Sets the filename back to the default filename.
  • gainhi [-d]
    Sets the gain mode to high gain.
  • gainlo [-d]
    Sets the gain mode to low gain.
  • impath [-d] text
    Sets the path of the image saving to nn.
  • imtype [-d] text
    Sets the value of the FITS keyword IMAGETYP to "text".
  • mdark [-d][-t][-f] tt nn
    Makes nn dark exposure of tt seconds. To abort the exposures press "Control-C".The image type (IMTYPE keyword) will be set to "DARK" if the exposure time is non-zero and "BIAS" if it is zero.
    If the '-f' option is used, the command will finish (i.e. the prompt return) when the (last) exposure is finished and the readout begins.
    If the '-t' option is used, a simulated exposure is made. This is usefull for script testing.
  • mexpose [-d][-t][-f] tt nn [imtype]
    Makes nn exposures of tt seconds. To abort the exposures press "Control-C".The 'imtype' option (IMTYPE keyword) is optional and must be a text string without spaces.
    If the '-f' option is used, the command will finish (i.e. the prompt return) when the (last) exposure is finished and the readout begins.
    If the '-t' option is used, a simulated exposure is made. This is usefull for script testing.
  • focusexpose [-d] nnnnn mm tt]
    Makes a focus exposure. 'nnnnn' is the focus start value, 'mm' is the focus step size between sub-exposures and 'tt' is the exposure time for each of the sub-exposures. 5 sub-exposures will be made.
  • focus5expose [-d] nnnnn mm tt]
    Makes a focus exposure. 'nnnnn' is the focus start value, 'mm' is the focus step size between sub-exposures and 'tt' is the exposure time for each of the sub-exposures. 5 sub-exposures will be made.
  • focus7expose [-d] nnnnn mm tt]
    Makes a focus exposure. 'nnnnn' is the focus start value, 'mm' is the focus step size between sub-exposures and 'tt' is the exposure time for each of the sub-exposures. 7 sub-exposures will be made.
  • focus9expose [-d] nnnnn mm tt]
    Makes a focus exposure. 'nnnnn' is the focus start value, 'mm' is the focus step size between sub-exposures and 'tt' is the exposure time for each of the sub-exposures. 9 sub-exposures will be made.
  • object [-d] text
    Sets the value of the FITS keyword OBJECT to "text".
  • clearobject [-d]
    Clears the value of the FITS keyword OBJECT.
  • observer [-d] text
    Sets the value of the FITS keyword OBSERVER to "text".
  • rempath [-d] nn
    Sets the remote saving path to nn.
  • remsystem [-d] nn
    Sets the remote host computer to nn.
  • remsave_off [-d]
    Turns off remote saving.
  • remsave_on [-d]
    Turns on remote saving.
  • readout [-d]
    Closes the shutter and reads out the ccd. You have to put the exposure in the background first.
  • resetxy [-d]
    Resets the ccd binning to 1, the X and Y sixe to maximum and the X and Y beginning to 1.
  • save [-d]
    Saves an read-out image to disk.
  • xbin [-d] n
    Sets the binning factor in the X direction to n.
  • ybin [-d] n
    Sets the binning factor in the Y direction to n.
  • sethi [-d] nn
    Sets highcut to nn.
  • setlow [-d] nn
    Sets lowcut to nn.


Note that the commands below are not needed for normal use, but can be practical for more advanced use.

MOSCA/FASU aux. commands (mosca.command in scripts)
(if used with option "-d" extended debugging information is written to the log):

  • fasua [-d] pos
    Returns the position (0-6) of the element in the light path.

  • fasua [-d] name
    Returns the name of the element in the light path.

  • fasua [-d] id
    Returns the NOT ID of the element in the light path.

  • fasua [-d] ready
    Returns '0' if the element is moving. '1' if it is ready

  • fasub [-d] pos
    Returns the position (0-6) of the element in the light path.

  • fasub [-d] name
    Returns the name of the element in the light path.

  • fasub [-d] id
    Returns the NOT ID of the element in the light path.

  • fasub [-d] ready
    Returns '0' if the element is moving. '1' if it is ready


Back to top Last modified: 07-Jun-2013