E. Video Interface
1. Outline
Unlike the conventional video interface, which uses an individual signal line for each signal
exchanged between the interface controller and engine controller, this printer uses command
status.
This section describes the kinds of interface signals between the engine controller and inter-
face controller, and gives information of the sequence of printer operation using the interface sig-
nals.
a. System diagram
Figure 2-2-7
b. Video interface signals
Figure 2-2-8
CHAPTER 2
2 - 14
Interface controller
Video interface signal
(see Figure 2-2-8)
External device (host computer, etc.)
Printer
Engine controller
BD INPUT
signal
(/BDI)
Laser driver
BD PCB
VIDEO
signal
(VDO)
LASER
CONTROL
signal
(CNT0)
VIDEO
signal
(/VDO)
LASER
CONTROL
signal
(CNT1)
/BD
/RESET
/SC
/SCLK
/VDO
VDO
Interface controller
Engine controller
