ICIMACS for the Wise Observatory 2Kx4K Camera: Software Notes

3/1/00 : JAM

(ICIMACS = Instrument Control and Image Acquisition System


Command Changes:
The AMPS command from version 4.6 has been replaced by the READOUT command, to keep the Wise code compatible with other ISL instruments.

Using the READOUT amps command:
For the 2Kx4K CCD, three readout modes are available: two amplifier (READOUT rl), and the two single amplifier modes (READOUT r)(READOUT l).

SCSI Bus Activity:
Any other computer sharing the SCSI bus with the IC must limit its bus activity. The computer should only stay on the bus long enough to transfer images to their final location, as the IC can't tolerate long delays in accessing the bus.

Overscan, Binning and ROI
The overscan taken by the IC may be changed automatically following changes in binning or ROI. This is done in order to keep the total number of acquired pixels a multiple of the binning factor.

2 Amps and Binning
In 2 amplifier mode, x binning values that are not factors of the number of data pixels will result in dark columns down the center of the image. These are due to data pixels being binned with overscan pixels in the final image.

2 Amps and ROI (Region-of-Interest)
In 2 amplifier mode, the ROI selected will be adjusted so that it is symmetric around the detector centerline. The size of the area selected will be increased in one direction until the area is centered.

ROIClean
The erase cycle may be selectively omitted during region-of-interest readout using the ROICLEAN command. ROICLEAN OFF omits the erase cycle during ROI readout, while ROICLEAN ON uses the same erase cycle as the full device readout.

CLEAN
There is no clean cycle for detector preparation for integration defined for the 2Kx4K detector. Therfore, the number of clean cycles should always be set to zero (CLEAN 0).

Choosing a machine address
While any two letter combination is valid as an address when communicating with the IC, the address WC has some important functions. I would recommend that your machine call itself "WC" in messages with the IC.

Telescope and instrument controllers interface
If desired, telescope and instrument data can be embedded in the image FITS header by enabling them in the WISE.INI file, and sending formatted strings to the IC on request.

To save telescope data:
Set TCENABLE=T in WISE.INI
If your machine is called "WC" (see above), the IC will send the string IC>WC TCSTATUS before each acquisition cycle. Respond to this message with a string of the form WC>IC STATUS: keyword=value keyword=value .... The IC will append these keywords and values to the end of its FITS header after formatting them to the FITS standard.

To save instrument data:
Set IEENABLE=T in WISE.INI
If your machine is called "IE" (see above), the IC will send the string IC>IE ISTATUS before each acquisition cycle. Respond to this message with a string of the form IE>IC STATUS: keyword=value keyword=value .... The IC will append these keywords and values to the end of its FITS header after formatting them to the FITS standard.

Of course, the IC does not care whether what you are sending represents telescope status, instrument status, or a grocery list. It thus provides an easy way to get any information you may find relevant into your image headers.


Imaging Sciences Laboratory
Revised: March 1, 2000 [jam]