Brother QL-720NW - Manual (Page 24)

Raster Command Reference
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4. Printing Command Details
4. Printing Command Details
NULL Invalidate
ASCII: NULL
Hexadecimal: 00
Description
 Skipped
 If data transmission is to be stopped midway, send the “initialize” command after sending the “invalidate”
command for the appropriate number of bytes to return to the receiving state, where the print buffer is
cleared.
ESC i S Status information request
ASCII: ESC i S
Hexadecimal: 1B 69 53
Description
 When a status information request is sent to the printer, a fixed size of 32 bytes is returned as a response
from the printer. For details on these 32 bytes, refer to the following page.
Note
Before sending print data to the printer, this command should be sent once. Since error
information is automatically sent by the printer during printing, do not send this command while
printing.
For details on transmission of the status, refer to “ 5. Flow Charts ”.