Canon CANOSCAN FB1210U Service Manual page 25

CHAPTER 2
2. Document Scanning Sequence
Sequence Standby
Time (Sec.)
Home Position
Sensor
Scanning Lamp
ON Signal
Drive Motor
Interface Signal
Sequence
After the power ON sequence is
completed until the scanner
Standby
receives a scan command from
the host computer
From the scanner receives a
scan command until it starts
Setup
scanning
After the scanner starts scanning
until whole scan area specified
Scanning unit
by the host computer are
forward
scanned
After the scanning unit starts
Scanning unit
moving backward until it returns
backward
to the home position
2 - 6
Scan Command
Setup
2.0
0.1
Figure 2-5
Operation
To maintain the scanner ready
for scan
To execute calibration for setting
gain data and shading data
To execute image processing
according to the command from
the host computer and send
image data to the host computer
while scanning
To return the scanning unit to the
home position to ready for the
next scan
Table 2-1
©
COPYRIGHT 2000 CANON INC. CANOSCAN FB1210U REV.0 APR. 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Scanning Unit
Scanning Unit Forward
Backward
90.0
Purpose
Standby
9.0
Remarks
The data is stored in DRAM
Home position is detected
by the home position sensor