4. Control option (ESC e)
This command is effective only when an option has been installed on the scanner. If you send these commands when no option is installed, the scanner returns a NAK signal and a command error results.
You can check if an option is installed by either using the ESC f command or by checking the option flag in the status byte.
When using the optional Automatic Document Feeder, you cannot select color page scanning; you should always use the ESC C command to select color line scanning, byte scanning, or monochrome scanning.
If you send this command when using the optional Transparency Unit or Automatic Document Feeder, the scannable area changes. Check the extended status information to determine the new scannable area.
5. Eject (FF)
If you send this command when the Automatic Document Feeder is installed, the scanner returns an ACK code and ejects the document when scanning is completed.
Control Codes
These are commands that control data transfer.
1. Header (STX)
Send this code to indicate the beginning of a data block.