Epson GT-6500 EN - Manual (Page 151)

Auxiliary Commands
ESC @ Initialize the scanner
Format: B2 B3 B4 B5 A5
Command: ASCII: ESC @
Decimal: 27 64
Hexadecimal: 1B 40
Parameter: (none)
Handshaking:
1 ESC @ command
2 ACK code
Explanation:
When this command is received, the scanner initializes itself, and the
command settings are reset to the default values. Downloaded data,
such as user-defined dither patterns, remains.
Command Reference 3-57