150  A-Class 
direct thermal media Media coated with chemicals that react and darken with the 
application of heat. 
 
DPI (dots per inch) A measurement of resolution, rated in the number of thermal 
elements contained in one inch of the printhead.  
 
DPL (Datamax Programming Language) Programming commands used specifically for 
control of and label production in Datamax printers. A complete listing of commands can 
be found in the Class Series 2 Programmer’s Manual 
 
DPMM (dots per millimeter) A measurement of resolution, rated in the number of 
thermal elements contained in one millimeter of the printhead.  
 
EFIGS  English, French, Italian, German, Spanish, and other multi-language support as 
programmed for the printer’s menus and configuration label. 
 
fan-fold Media that is folded and stacked. 
 
feed speed The rate at which the media moves under the printhead in non-printed areas 
and between labels. 
 
Flash memory Non-volatile memory (does not require printer power to maintain data) that 
can be erased and reprogrammed, used to hold the printer’s operating program. 
 
font  A set of alphanumeric characters that share a particular typeface. 
 
gap  A space between die-cut or notched labels used to sense the top-of-form. 
 
GPIO (General Purpose Input Output) A specialized interface port for use with external 
printer control devices including applicators, verifiers, RFID systems, etc.  
 
IPS (inches per second)  Imperial measurement of speeds.   
 
label A paper or synthetic printing material, typically with a pressure sensitive adhesive 
backing. 
 
label length The distance from the top of the label to the bottom of the label as it exits the 
printer. 
 
label repeat The distance from the top of one label to the top of the next label. 
 
label tracking Excessive lateral (side to side) movement of the media as it travels under 
the printhead. 
 
label width The left to right measurement of the label as it exits the printer. 
 
mark Generalized term for the carbon-based black line on the underside of reflective media 
used to indicate the top-of-form. 
 
media Generalized term for all types of printing stocks, including: roll fed, continuous, die-
cut, reflective, and fanfold. 
 
media hub Device in the printer used to support roll media.