Epson EPL-5500, Service Manual, Page: 42 / 145

1.4.6 Emulation Mode Switch Function
This section describes the emulation mode switch function.
1.4.6.1 Emulation Switch by SPL
The two types of emulation switch function described below are available on this printer. Together
they are referred to as SPL (Shared Printer Language).
EJL: EPSON Job Language
This is EPSON’s original language system. It is used to skip among various destinations, as shown
in Figure 1-12.
PJL: Printer Job Language
This is HP’s original language, which is available with LaserJet 4 printer. It is used to skip among
various destinations, as shown in Figure 1-12. The precise specifications for this language are based
on HP LaserJet 4.
The figure below shows three types of mode switching.
Neither EJL nor PJL switches the mode directly. They first exit the current mode and return to EJL
or PJL. Then they enter another mode.
1.4.6.2 Intelligent Emulation Switch
Intelligent Emulation Switch (IES) automatically switches emulation mode, depending on the data
sent from the host computer through one of the interface channels. It is able to switch between
EPSONScript and other modes as shown in the figure below.
1.4.7 Bi Resolution Improvement Technology
The EPL-5500 printer has BiRITech (Bi Resolution Improvement Technology), which is designed to
improve print quality at 600 dpi and 300 dpi. By this method, the dot map data extracted from the
image data is reassembled to improve print data.
LJ 4
EPSONScript
EPSON GL/2
EJL
PJL
FX
ESC/P 2
Figure 1-12. Emulation Switch by SPL
EPSONScript
LJ4
FX EPSON GL/2
ESC/P 2
Figure 1-13. Intelligent Emulation Switch
EPL-5500 Service Manual General Description
Rev. B 1-29