Epson GT-6500 EN - Manual (Page 70)

Scanner state data
This is the data sent in response to the ESC S (Request condition)
command. The example below is for a B4-level scanner.
The first two bytes are the ESC C (Set color) command’s parameters.
The next 5 bytes are the ESC R (Set scanning resolution) command’s
parameters.
The last two bytes are the ESC g (Set scanning mode) command’s
parameters.
Transfer order
The recommended order of data transfer for each type of data is
outlined in the flow charts below.
2-32 Command Usage