Epson GT-6500 EN - Manual (Page 160)

CAN Abort scanning
Format:
ASCII: CAN
Decimal: 24
Hexadecimal: 18
Explanation:
This code aborts a scanning operation, and returns the scanner to the
command waiting mode (ready state). An ACK code is returned from
the scanner.
This code should be sent by the computer in place of an ACK code
during scanning operation. See the explanation of the
ESC G command for more details.
The CAN code is valid only when the scanner is waiting for an ACK
code during a scanning operation. If a CAN code is received at any
other time, it is treated as a command error and a NAK code is
returned from the scanner.
3-66 Command Reference