Differences Between the P200 and P60

As far as the code is concerned there are only two minor differences between the 200-inch and the 60-inch code. First is the default question at OSCAR (i.e. the 60-inch) is ``are you at the 60-inch telescope'', while at SAM (i.e. the 200-inch), the default question is ``are you at the 200-inch telescope?''. Also, there is a minor difference in the system startup file where at the 60-inch channel FWA0: (port TTA1:) runs the filter wheel, while the 200-inch has channel LMA0: on the same port assigned to the flat field lamps. Otherwise, the code is completely identical. The printers are different, although to print a text file you need only type PRINT AAAA.BBB on either computer (where AAAA.BBB is the full name of the text file you wish to print out). Printing a plot file (i.e. making a graph) requires notifying PGPLOT of which printer you are using. This is set by typing HARD /PRINTRONIX or HARD /TOSHIBA respectively. This needs to be typed only once, before any plots for which you desire hard copies are produced. Instructions for producing a plot are in section Xa.

There is one further difference. At the 200-inch, the commands FMOVE and ECHMOVE do not function as the necessary hardware is not used there. Instead, the filter codes are from the list of those installed in the Double Spectrograph. The software checks the camera port number (1 for the blue camera and 3 for the red camera), gets the filter position (0 to 3) from the telescope control computer (where it comes in from the cass cage), and puts the appropriate filter identifier selected from the table below into the header of the frame.

The one letter filter code used in determining the name of the frame itself comes from the filter table; to obtain the correct 1 letter filter identifier in the name of the frame, you must be sure to edit the filter table using FZERO, although we have not yet resolved how to get the correct 1 letter code into the name of the frame for both the red and the blue cameras at the same time. This is not critical, as long as the correct filter identifier is in the header of each frame. (It isn't critical for batch flat fielding either as the software checks the camera port number.)

Filter Codes at 200 Inch Telescope

(Double Spectrograph)

0 None None

1 None GG455

2 GG495 GG495

3 None RG610

The slit given in the header of spectroscopic frames from the 200-inch telescope is the slit code from the cass cage via the telescope control computer interpreted according to the table below.

Slits at 200-inch Double Spectrograph

$$^{\prime\prime}$$ 0 0.5S

$$^{\prime\prime}$$ 1 1.0S

$$^{\prime\prime}$$ 2 2.0S

$$^{\prime\prime}$$ 3 4.0S

$$^{\prime\prime}$$ 4 6.0S

$$^{\prime\prime}$$ 5 8.0S

$$^{\prime\prime}$$ 6 10.0S

$$^{\prime\prime}$$ 7 3.6A

The slit of the spectrograph at the 60-inch telescope is not readable by the Microvax, and defaults to the indicator for the numerical value 0 (i.e. 0.5S). If you desire to have the correct slit in the header of a particular frame, use the LET command:

$ LET A123F.OBS.SLIT=``1.0S''

will put the indicator for a 1 arc-sec slit into the header of frame A123F.

Serial Ports

The table below gives the current assignments of the serial ports at each telescope. Of the 8 ports available at the 200-inch telescope, 6 are dedicated to various functions, and two are free. There are no free ports at the 60-inch telescope at the present time.

Dedicated Port Assignments

txa0: telescope control link tta0: telescope control link

txa1: lamp control tta1: filter wheel

txa2: VT100 terminal tta2: modem

txa3: modem tta3: 2048 shelter

txa4: Four Shooter

txa5: Four Shooter

txa6: free

txa7: free