4. TERMINOLOGY; 4.1. Syntax; 4.2. Conventions- Page 297

CHAPTER 6 EPSON - 7 

4.

TERMINOLOGY 

4.1.

Syntax 

The following conventions are used in this description of the Epson FX-850 mode software commands: 

A single letter, two or three-letter control code mnemonic, or number in upright bold text is a literal 
character and should be sent to the printer as the character code. 

A letter or word in italics is a variable and you must substitute an appropriate value when you use the 
command. 

A statement element enclosed in angle brackets <> consists of a stream of data whose length is defined 
within the same command.  The data consists of numbers represented by bytes which are sent to the 
printer as if they were ASCII character codes. 

4.2.

Conventions 

Although the machine is a laser printer and does not physically have a print head, for the purposes of this 
emulation description, we refer to the location on the page at which the printer is currently positioned to 
print as the print position. 

The printable area is the area of the page where the printer can place a dot. 

The bits that comprise a byte of data are numbered 1 to 8.  Bit 1 is the least significant bit (LSB) and bit 
8 is the most significant bit (MSB). 

The lower case 'L' character is shown as an '

l

  ' in the 

Esc 

l

 printer command, to distinguish it from the 

character '1' (one).