The Main Screen
The Main Screen is divided into several regions and special purpose
windows may appear superimposed onto this screen. The upper quarter
of the screen contains four types of information. As noted above
the top line contains the visual cue that tracking is in progress.
More specifically, this is the tracking command string which
is issued to the Superior card 4-5 times per second. Every time
the color of the blinking Y changes, a new command has
been issued. You will notice that during hand paddle moves or
automatic moves, the Y does not change color since no tracking
commands are being issued then.
Below the tracking message is the version number of the software
and the starting time stamp. When you send the telescope HOME,
you will see an ending time stamp below the starting time, the
length of the run, and the observer's ID. The log file is then
updated on the hard drive.
Directly below the version number is a line that shows the postion of the off-set stages. The X-coordinate of each stage is the direction parallel to the sides of the photometer box and closest in direction to the declination axis. The Y-coordinate is perpendicular to this. The units are motor pulses and the origin is the optical axis of the photometer.
The display at the upper right contains the actual commands being
issued to the Superior card. Notice that the display is further
divided into RA Command (Right Ascension axis), DEC Command (Declination
axis), and Reg Command (Register commands). The command will
appear in white as it is sent and will change to cyan as it is
received from the Superior as an echo. Each command is checked
character by character to ensure accuracy in transmission. It
is not necessary that you understand these messages, but their
display and color changes may be vital clues to any problems that
Below the command lines are two areas that give visual feedback
about hand paddle use. When a paddle button is pressed, you will
see the direction indicated (e.g., Manual West) followed by the
rate at which the telescope is moving (either guide, set, or slew).
See the section on the hand paddle for the operation of the directional
and rate switches.
The lower three-quarters of the screen is itself divided into
two parts. The left side is the system display. The entries
||the Universal Time|
||the telescope's operational status. A variety of messages may appear here, such as Ready, Moving, Select Group, Focus, Integrating, Advance, Backup, or Jump.
||the current object.|
||the current filter.|
||the length of the next integration.|
||counts/second from the left hand photometer.
||counts/second from the central photometer.
||counts/second from the right hand photometer
The right hand side of the screen contains both the Main Menu
and the data screen. Each of the many menus of three_c
are discussed below. General rules for the use of the menus are:
Select a menu item by placing the highlight bar on the item
using the cursor keys and pressing .
Backup to the previous menu by pressing ESC.
The highlight bar will wrap around in both directions in most
Items can also be selected using the "hot keys" indicated.