Request Id (Esc I); Request Status (Esc F); Extended Status Request (Esc F) - Epson ES-1000C Reference Manual

2. Request ID (ESC I)

When the scanner receives this command, it relays the scanner ID
information to the computer in the following order.
Scanner command level
Available resolution values
Maximum scannable area
(at the highest resolution, with 100% zoom)
If you are creating a program for use with different scanner models,
you can use this command to determine the features and settings
available on the connected scanner model.
The ID information is transferred as a data block from the scanner to
the computer. See Appendix B for details on the ID information for
each scanner model.

3. Request Status (ESC F)

When the scanner receives the ESC F command, it sends a data block
to the computer that includes the status information. See page 2-28 for
details on status information. The length of the information block
within the data block is four bytes. The contents of these four bytes
are as follows:
Header (STX)
Status
Byte counter

4. Extended Status Request (ESC f)

Upon receiving this command, the scanner sends a data block to the
computer that includes the status of the scanner and any options
installed.
The data block is composed of the normal information block
combined with 33 bytes of extended status data.
1 byte
1 byte
2 bytes
Command Usage
2-3