This is the Control Panel, which lives in the Control Room. Under normal conditions, observers only use this panel to raise and lower the shutter, and to enable/disable all motion via the big red Stop Button. But you wouldn't be reading our manual if you were content with such pedestrian functions. The red arrwos point out some features:

1 - These two buttons activate/disactive portions of the dome hydraulics system (the system which pushes the drive wheels against the rail, to anable the dome to rotate. You should not mess with these buttons

2 - Pushing this button opens the shutter.

3 - Pushing this button closes the shutter.

4 - Pushing this button stops the shutter at its current position. You don't need to push this button if you wish the shutter to open or close fully. The shutter will stop automatically when it hits one of those two positions.

5 - This is the Shutter position readout. It's pretty inaccurate. The reading will be especially inaccurate if you have reversed directions one or more times during the opening or closing process. The counter in the shutter circuit essentially does unsigned arithmetic. The upshot of all this is that if you've pushed the Open button, and allowed the shutter to open until it shut itself off automatically, yet the position still reads something like 93% - don't worry about it. Also, this display sometimes displays gibberish if the shutter is fully open or closed. You would not believe the circuit that drives this display.

6 - STOP BUTTON Pushing this button inhibits ZA and Az motion of the telescope. The dome and shutter drives are also inhibited. You should push this button when you leave the building.

7 - Red lights like this one are illuminated when some condition is inhibiting the drive systems. This particular light is illuminated when the Control Panel Stop Button is engaged.

8 - This light is illuminated when the ACLB box is enabled. It must be green if the antenna is to move. It is enabled automatically by the antenna computer.

9 - This light is illuminated when the azimuth drive system is enabled. It is controlled by the antenna computer and ACLB