Epson EMP-TW 1000, Reference Manual

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Data Block Transfer Order
The computer sends commands and parameters to the scanner in 8-bit
code format. The scanner sends data to the computer in groups of
8-bit codes called ‘‘blocks.’’
Data block structure
Data blocks can take two forms: line data structure and block data
structure.
Note:
The scanner must support the ESC d (Set line counter) command and
be function level B4 or higher to transfer data using the block data
structure.
A data block consists of two parts: the first part contains a header and
status block; the second part is the scanned data extended.
Line data structure
Line data consists of a 4-byte information block followed by either an
ID information data, an extended status data, or one line of the main
scan image data.
The information block size is fixed at four bytes. The amount of data
following differs depending on the data type. The byte counter in the
information block specifies how much data is contained in the block.
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Command Usage