Parallel Interface - Epson ES-1000C Reference Manual

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.
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Command Usage