Variables ; 1.4.3. Strings ; Invalid Commands - Page 211

2001/10/02 

CHAPTER 5 PJL - 7 

1.4. 

Variables 

PJL can use alphanumeric variables, numeric variabless and strings. 

1.4.1.  Alphanumeric variables 

The first character must always be a character in the allowable range of letters and digits.  Letters consists 
of the uppercase characters (ASCII 65-90) and lowercase characters (ASCII 97-122).  Digits consists of the 
numbers 0-9 (ASCII 48-57). 

<Example> 

Brother2245 

1.4.2.  Numeric variables 

The number consists of digits with one optional decimal point and an optional + or - sign preceding the 
first digit.   

<Example> 

0.1234 

-123.4 

+123.0 

<Wrong> 

+.05 

-.05 

1.4.3.  Strings 

Strings consist of any combination of characters from ASCII 32 to 255, plus ASCII 9, except ASCII 34 
(quotation marks), which are used to define the start and end of a string. 

<Example> 

"Print Job  KKK" 

"This is a s ample string" 

1.5. 

Invalid Commands 

There are two general types of invalid commands.  Each type operates differently. 

Syntax errors include :  

• 

unrecognized command and command modifier 

• 

strings which are missing quotation marks 

• 

numeric values which are missing digits before the decimal point  
 

1.5.1.  Syntax errors 

Commands received with Syntax errors cause the printer to ignore the entire PJL command.  

1.5.2.  Syntax warning and semantic warning 

Syntax warnings and semantic warnings are issued for commands which include unsupported options, values 
which are out of range, or wrong  or missing commands, etc.  When the printer receives commands which 
would create a syntax warning or semantic warning, it operates the command as long as possible, however, 
the  portion of the command which would create a  warning is ignored.