Initialization
The scanner can be initialized (returned to a fixed set of conditions) in the
following ways:
Hardware initialization
* The scanner is turned on.
* The scanner receives an INIT signal from the
parallel interface: pin 31 goes LOW.
* The scanner receives a SCSI Reset signal
from the SCSI interface.
Software initialization
* Software sends the ESC @ (initialize the
scanner) command.
* The scanner receives a SCSI Bus Device
Message,
Appendix A-7
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