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10/10/03
CHAPTER 2 "PCL" - 101
8.5.17. Font cache
In order to print characters from a scalable font, the printer changes the scalable character outlines into sized
bitmaps. These bitmapped characters are produced on a character-by-character basis and the produced
bitmapped characters are stored in memory. As it prints more pages using more fonts, more memory is
consumed by the bitmaps. The bitmap characters used on the first page of a job can stay in memory till the end
of a job. These stored bitmap characters are known as the font cache.
If a Brother HL-Series printer encounters a memory low condition, all of the font cache is automatically deleted.
Also, font cache and temporary entities can be cleared by a Printer Reset command.
8.5.18. Memory status response
The total available memory is specified by "TOTAL=" and the largest continuous block size of available
memory is specified by "LARGEST=".
PCL
INFO MEMORY
TOTAL = 10000
LARGEST = 3500
8.5.19. Memory error response
When the value field of the free memory command is out of range, the response for this command would be as
follows;
PCL
INFO MEMORY
ERROR = INVALID UNIT
8.5.20. Flush all pages command
ESC&r#F (27)(38)(114)#(70) <1Bh><26h><72h>#<46h>
This command suspends accepting data from a PC and clears the user memory.
• #=0 suspends receiving data and clears all completed data. Incompleted data remains in the printers memory.
• #=1 suspends receiving data and clears all data remaining in the printer memory.
8.5.21. Echo command
ESC*s#X (27)(42)(115)#(88) <1Bh><2Ah><73h>#<58h>
This command is used to distinguish each request and response. In networking/sharing environments, some
requests may be sent from a number of PCs to one printer. This command sends the user selected value to the
printer and the printer can return the same value. Adding this command before the status request command
allows this echo value to distinguish the corresponding status response.