Sheet1:

Simplified Drawing

The Filterwheel Pushbutton Station is used to manually move the science filterwheel into an ordinal filter load position. The station consists of controls to move or stop the stage movement. In the middle of the gray box is the Station Enable switch. This switch is a DPDT limit switch that is actuated by opening the filterwheel access door. Once actuated, +5V is applied to and turns on the yellow ENABLED LED. At the same time, the controller software will signal the control computer that the stage is under manual control. The red STAGE IS MOVING and green IN POSITION can then be turned on by the controller software to indicate the status of the stage. If no button has been pushed, the green LED should be on indicating that the stage is in an ordinal position. At this point the software polls the filter POSITION pushbuttons via the *FILTER WHEEL REQ signals. If a pushbutton is pressed, the controller will decode the intended position and move the corresponding filter into it's unload position. If the operator detects a problem while the stage is moving they can press the STOP button to signal the controller to terminate the movement.
Under software control the red STAGE IS MOVING LED will be turned on until the stage comes to a complete stop at the desired filter's load/unload position and the green IN POSITION LED will turn on. Once the filters have been loaded, closing the access door will notify the controller software that the stage control is ready to be released back to the control computer

 

Sheet2:

 

Simplified Drawing

Sheet 2 shows the wiring, connector, and bit assignments for the filterwheel pushbutton station.