Epson GT-6500 EN - Manual (Page 68)

Data
This is the data block following the information block. The type of
data in the data block depends on the type of information requested by
the computer.
Image data
Image data blocks sent in response to the ESC G (Start scanning)
command
ID information data
Data, including the scanner function level, sent in response to the ESC
I (Request ID) command
Scanner state data
Data on the scanner’s current settings and parameters sent in response
to the ESC S (Request condition) command
Extended status data
Data on the scanner’s option settings sent in response to the ESC f
(Request extended status) command
Note:
The data block sent in response to the ESC F (Request status)
command consists of the information block only; no data block is
included. Because of this, the byte counter is set to 0 (00H, 00H).
Use this command when you need to check only the contents of
the status byte.
Image data
This is the scanned image data sent in response to the ESC G (Start
scanning) command. The amount of data sent depends on the current
scanner settings.
The commands that determine the amount of data are the ESC D (Set
data format) command and the ESC A (Set scanning area) command.
ID information data
This is data sent in response to the ESC I (Request ID) command.
This data includes the following.
2-30 Command Usage