Canon BJC-55 Series, Service Bulletin

Page: 113 / 249

1.2.2 Scanner mode
When powered on, the printer starts up in the printer mode regardless of the printer
head type.
Once the printer is on, it stands by to receive a data or a command.
When the printer recognizes the scanner activation command, the printer starts
operating in the scanner mode. After the printer recognizes the scanner head and
performs the POWER ON operation, the printer starts to preheat the scanner head.
4-3
BJC-50
Part 4: Technical Reference
Scanner cartridge
preheating initialization
After preheating,
start scan
Scan ends
After scanning selected
area, scanning
document is delivered
END message
Scanner activation
command received
Scanner activation
message issued
Wait for command and message
·
·
·
Host computer starts up scanner driver.
Data received by DMA transfer stored in RAM.
After scanning, the VH converted data is transferred
to the host computer.