Epson GT-6500 EN - Manual (Page 93)

Problem:
When connecting a different scanner model, a
time-out occurs on your computer and you can no longer scan.
Cause
The time required for the initialization process and
for the preparation time when you send an ESC G
command differs by scanner model. The new
scanner model took longer than the previous scanner.
Solution
Make sure you provide enough time on your
time-out clock to handle all scanner models
(35 seconds should be enough).
Problem:
When writing data from a GT-6000 or GT-4000 to a
magneto-optical disk, an interface error occurs on the scanner.
Cause
On the GT-6000/4000, the scanner produces an
interface error if no handshake response is received
within 30 seconds. If a writing operation takes longer
than 30 seconds, this error occurs.
Solution
Adjust the size of your data buffer so that no writing
operation takes longer than 30 seconds.
Here are some additional items to consider when you write a scanner
program.
Command Usage 2-55