Printronix ThermaLine Series - Manual (Page 17)

1–5 Introduction
How the IGP/PGL Operates
IGP/PGL is an emulation that allows you to print sophisticated graphics and
bar codes.
Depending on what the printer is doing, it is always in a particular mode,
which is transparent to the user. These modes are discussed in more detail in
Chapter 2.
When the printer is receiving text or printing text, it is in Normal mode. Any
time the printer is on and is not processing IGP/PGL commands, it is in
Normal mode.
When a Create Form command is issued, the printer moves from the Normal
mode to the Create Form mode.
During this phase, the user sends text, images, and bar code data to the
IGP/PGL. All of this data is stored in memory. An End statement terminates
the IGP/PGL data string. The printer returns to Normal mode.
You can create as many forms as you wish and store them on your host or in
external printer memory.
All forms have filenames. You may want to print the form, label it, and store
it for future reference. Or, you can devise another method for easy retrieval.
These forms can then be downloaded from your host to the printer.
When you Execute a form, you can print it as many times as you wish. This
saves you time from downloading the form each time you want to print it.