HP 5961-0509 manual Horizontal Motion Index HMI, Buffer, Interface Connector

Horizontal Motion Index (HMI)

HMI defines the distance between columns in 1/120 inch increments. When fixed pitch fonts are selected, all printable characters including the space and backspace characters are affected by HMI. When proportional fonts are selected, the HMI affects only the space character.

HMI is defaulted when font orientation, symbol set, pitch, spacing or height is specified and when switching between primary and secondary fonts with Shift In and Shift Out.

The default HMI is equal to the pitch value in the font header. The factory default font’s HMI is 12 (which is 12/120 = 1/10 inch per character or 10 characters per inch).

HP-GL/2

PCL 5 printers provide the ability to print vector graphics using the HP-GL/2 graphics language commands. HP-GL/2 graphics may be created within application software or imported from existing applications. For various types of images (many technical drawings and business graphics, for example), it is advantageous to use vector graphics instead of raster graphics. Advantages include faster I/O transfer of large images and smaller storage requirements. See Chapter 17 for more information.

I/O

I/O is an acronym for input/output (I/O) and is used in this document when referring to hardware used to interface printers with computers.

I/O Buffer

The area within the printer’s internal random access memory (RAM) where PCL commands and data are stored.

Interface Connector

The LaserJet printer comes with two interface connectors, serial and parallel, located on the lower part of the back panel. The cable that attaches the computer to the printer is connected here. (Also see Parallel I/O or Serial I/O.)

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