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QUIRC User Guide
ll file Read DSP code .lod file
ll readsa DSP code binary file into the Sparcstation memory.
dl DownloadDSP code
dl sends the DSP code to the DSP electronics, and then causes the DSP to start
executingthis code. dl also asks the DSPto recalibrate its A/D converter, whichtakes
about 2 seconds.
du file Download Utility board code
duloads the utility board code. Thiscommandshould be run after the DSP has been
initilalizedwith the dl or df commands above. Theutility board code is necessary to
performfilter wheel and pupil slide motions.
Example: du util
8.2 Commands for setting up and taking exposures
Qcdcom takes exposures and writes data files according to various parameters which you can set.
Thebasic sequencethat qcdcom follows is to
1. Reset the chip
2. Do dummy read to stabilizearray
3. Perform first data read of double-correlationpair, store image in memory
4. Turnoff output amplifiers
5. Open the shutter and waitfor a predetermined exposure time
6. Close the shutter
7. Turnon output amplifiers
8. Do dummy read to stabilizearray
9. Perform second dataread, subtract the first from it, store in memory
10. Write the contentsof memoryinto a FITSformat data file
11. Put the controller into resetidle mode
These actionsare performed by the fundamentalcommand go, which is described below. First, the
commandswhich tailor the sequence followed by go are given.
Not all of these steps may be taken, and the actual sequencefollowed depends on how the automatic
actions are set, as described below. There are a numb erof ways to set the paramet ers which govern
whatqcdcom does. Severalcommands are available which can be used to set integrationtime, object
name,object type (a FITS header item), and default automatic actions. None of these does anything
morethan setting parameters to be used later—only go takes an exposure.