3-51
Control Panel Description
Control Panel Functional Operation
The following pages discuss the functions of the circuits in the Model 4000 Control
Panels.
Model 4000-2A/B
Communication between the frame and the Control Panel is over a single cable
containing five sets of serial lines as follows:
■
M/E 1 data link (serial port) transfers data to and from M/E 1 communications
processor in the signal frame. The Control Panel CPU module reads and writes
data to the 38K baud asynchronous RS-422 port. The Control Panel CPU
communicates the status of all PuPs, switches, knobs and lever arms to the M/
E 1 processor on the Controller module.
■
M/E 2 data link performs exactly the same functions as M/E 1 but for M/E 2.
■
F/F Mix data link is a serial port that transfers Flip/Flop Mix/DSK data to and
from the frame via a peripheral processor on the Controller module. The
Control Panel CPU module reads and writes data to this synchronous 1.2M
baud RS-422 port. The Control Panel CPU reads the status of the upper and
lower PuP modules to transfer switch, knob, lever arm status, flat panel
display and 3.5" disk data to a peripheral processor.
■
Status Terminal port is a serial RS-422 port that transfers data between the
frame and a VT-100-compatible status terminal. The terminal data lines are
looped through an internal switch in the tub and on to the Signal Processor
frame.
Processing of operator controls on the Control Panel is handled by two Peripheral
Utility Processors (PuPs). One PuP monitors the upper Control Panel area and
another monitors the lower panel.
The flat panel display is driven by a graphics controller/driver circuit on the
Control Panel CPU module. Both text and bitmap graphic data are directed by the
CPU to the controller for the actual work of pixel addressing, refresh and
manipulation. A PuP is not used with the flat panel, the controller communicates
directly with the CPU.
Another device that communicates directly with the CPU, is the 3.5" floppy disk
controller circuit. Parallel data words are sent to and from the drive controller,
which formats the data and handles all read/write drive control operations (head
stepping, track/sector seek, etcetera).
The 68000 (series) MPU on the Control Panel Central Processor module has its own
EPROM, RAM and support logic. Firmware contained in EPROM supplies the
instruction for event scheduling, real-time operation, file management (3.5" disk)
and device control.
Summary of Contents for Grass Valley 4000
Page 3: ...iii Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 4: ...iv Tektronix Grass Valley Products P O Box 1114 Grass Valley CA 95945 916 478 3800 ...
Page 34: ...1 20 Section 1 System Overview ...
Page 138: ...2 104 Section 2 Installation ...
Page 196: ...3 58 Section 3 Functional Description ...
Page 286: ...Index 6 Index ...