Document Scanning; Sequence - Canon CANOSCAN D1230 series Service Manual

CHAPTER 2
D. Document Scanning Sequence

Sequence

*Standby
Home Position
Sensor
Scanning Lamp
ON Signal
Drive Motor
Interface Signal
Seqence
After the scanner self test is
completed until the scanner
Standby
receives a scan command from
the host computer
From the scanner receives a
Setup
scan command until it starts
scanning
After the scanner starts scanning
until whole scan area specified
Scanning Unit
by the host computer is scanned
Forward
After the scanning unit starts
Scanning Unit
moving backward until it returns
backward
to the home position
2 - 6
COPYRIGHT
Scan Command
Setup *Scanning Unit Forward
Figure 2-5
Operation
To maintain the scanner ready
for scan
To execute calibration for setting
light exposure time, gain data and
shading data
To execute image processing
according to the command from
the host computer while scanning
and send imada data to the
host computer
To return the scanning unit to the
home position to ready for the
next scan
Table 2-1
©
2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Scanning Unit
backward
Purpose
The data is stored in DRAM
Home position is detected
by the home position sensor
Standby
Remarks