8.5.17. Font cache; 8.5.18. Memory status response; 8.5.19. Memory error response- Page 135

CHAPTER 2 PCL - 115 

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.