Advertisement
CHAPTER 1
C. Operation Outline
DC
Video
Controller
Controller
PCB
PCB
communication
RERURN-
BACK (GND)
The Video Controller supplies a +5V power supply to the Paper Handling Controller when the
printer power is turned ON, and communication commences after a specified period of time.
The microcomputer (CPU) on the Paper Handling Controller sends a POWER ON (PWRON) sig-
nal to the optional I/O device, turning the optional I/O device's power ON. Following this, the
Paper Handling Controller and optional I/O device commence serial communication.
The Paper Handling Controller sends pick-up and delivery command data for each page print-
ed to the optional I/O device based on data and the VERTICAL SYNCHRONIZED signal
(/VSYNC) from the Video Controller along with PAPER FEED (/PFED) and PAPER DELIVERY
(/PDLV) signals output from the DC Controller. The optional I/O device then returns its paper
feed status back to the Paper Handling Controller.
The S-RAM (IC110) constantly stores the latest 40 pages of communication data allowing the
CPU to control the optional I/O paper feed in real time for each page printed. `The Video
Controller monitors the paper feed status of the optional I/O device in real time by obtaining S-
RAM information via the Paper Handling Controller interface.
1 - 8
Paper Handling
Controller PCB
Serial
CPU
(IC101)
/VSYNC
/PDLV
S-RAM
(IC110)
/PFED
+5V
GND
Figure 1-3-3
Optional
input/output device
driver PCB
Serial
communication
communication
PWRON
GND
Optional
input/output device
driver PCB
Serial
PWRON
GND
Advertisement
