RAT(OPCS) Optical Printer Control System RAT(OPCS) NAME rat - change the projector/camera shoot ratio for the REP command USAGE rat [pro2] [pro1] [cam] # For aerial printers rat [pro] [cam] # For single head printers EXAMPLES rat 1 1 # straight print: 1x pro1 for every 1x cam rat 2 1 # skip print: 2x pro1 for every 1x camera rat -2 1 # reverse skip print: -2x pro1 for 1x cam rat 2 2 1 # aerial step print: 1x on pro1 & pro2 rat 1 -1 2 # aerial stretch frame print DESCRIPTION Sets the shooting ratio for consecutive REP commands. The shooting ratio defaults to 1:1, and can be changed by the RAT command. Once set, the projector/camera ratio will remain in effect until another RAT command is executed. You can use negative numbers in a RAT command to allow one or both motors to run in reverse. Feet/frames specifications can be used as arguments for the RAT command. ie: rat 1'0 3'4 # PRO shoots 1 foot, camera shoots # 3 feet 4 frames NOTES Absolute specifications such as '>12' have no meaning in the context of the RAT command. RAT does not actually SHOOT any frames, it only sets up a shooting ratio which is executed by running the REP(OPCS) command. Thus: rat -2 1 # set up a -2:1 ratio rep 12 # shoot that ratio 12 times When the above example executes, the projector will shoot a total of -24 frames, and the camera will shoot 12 frames. Each time the camera shoots a frame, the projector will backspace 2 frames. BUGS None. SEE ALSO RAT(OPCS) - set the shooting ratio for the REP command REP(OPCS) - shoot current projector/camera shooting ratio PROPHASE(OPCSDEFS) - sets projector phase adjustment for 1:1 shooting MATH(DOCS) - math expressions (for use in frame specifications) SYNTAX(OPCS) - Online calculator and OPCS math expression syntax ORIGIN Gregory Ercolano, Los Feliz California 11/29/89