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General
❏ Always reset the scanner at the beginning and end of your
programs
❏ Use the ESC @ command to reset the scanner. This allows you to
use the same program with different interfaces.
❏ The time required for resetting differs by scanner model. Because
of this, you should either disable your computer’s time-out or set
the time-out clock to 30 seconds or more.
Parallel interface
❏ If your program sends a command immediately after resetting the
scanner and gets a BUSY signal, wait at least 1 ms and send the
command again.
Option
❏ Always send a FF command after you complete reading of a
document from an ADF.
Using the ESC I command
❏ Always check the scanner information at the beginning of your
program. (This is not necessary if you provide a different driver
for each scanner model.)
About the function level
❏ Since higher-level scanners contain all the functionality of
lower-level scanners, no errors occur when you use a low-level
scanner program on a higher-level scanner.
❏ When running a program designed for a high-level scanner on a
lower-level scanner, make sure your program does not send any
unsupported commands; otherwise, an error results.
2-56 Command Usage