Control Ports - Christie 35/70 Maintenance And Service Manual

Control Ports

The projector has two serial control ports. In normal operation, they carry commands from a show controller or master
projector. For debugging purposes, the ports can be connected to a service terminal. Commands can also be input from
the projector control panel.
The serial communications protocol is set to 9600 baud; No Parity; 8 Data Bits, and 1 Stop Bit (9600/N/8/1). During
normal operation all commands sent to the projector will be echoed back, except when the projector is used in the SLAVE
mode of operation
Film and Shows
The reeling system holds approximately 2000' of film. The recommended type of film to use on the 35/70 projector is a
polyester based film. A film reel may contain from one to six different shows of varying length; the projector assumes
there is one show on a reel, unless a greater value is programmed (see Section 0). Each show is given a unique show
number from one (1) to six (6). Show numbers can be designated with reflective tape. Where possible, low-inertia reels
with core sizes of 4 inches or greater are recommended to minimize the stress applied to the reeling system.
Shows may be played in any order. The projector keeps track of the number of the show that is currently being played,
called current show, and the number of the show that is to be played next, called next show.
The projector has sensors that detect the reflective tape used to indicate the show number, beginning-of-film (BOF), and
end-of-film (EOF) markers. To reduce the possibility of mis reading film cues, film should be spliced with either clear
splice tape or an ultrasonic film splicer.
When splicing film on 35/70 projectors, running in the Master/Slave mode, insure that the film length on both projectors
remain the same to maintain film sync.
P r o g r a m m i n g B e g i n n i n g a n d E n d o f S h o w s
The BOF and EOF marks can be programmed by the 35/70 Projector in several ways:
• •
DEFAULT Mode
The projector programs itself as shows are played in the course of operation. After all shows
have been shown once, the projector logs all BOF and EOF cues.
• •
MEMORY Mode
The optional battery backup on the CPU card enables the projector to remember all cue points
from the last programming mode, even if the projector has been turned off in the meantime.
• •
AUTO LOG Mode
This mode of operation enables the projector to automatically log the positions of all the cues.
(See Section 0).
• •
MANUAL LOG Mode
This mode of operation allows the operator to manually enter all cue points into the projector's
memory. (See Section 0).
• •
SHOW CONTROLLER Mode
This mode of operation allows the projector to accept cue points from a show controller through
its serial communications port.
Procedures for programming the projector using these modes are described in detail in the command descriptions in
Section 0.
CHRISTIE INC. - 35/70 Service/PM Manual
July, 1997
2 . G e n e r a l D e s c r i p t i o n