Printronix T5000 Software Manual page 248

Chapter 6
Mapping
Figure 219. 25 Pin and 9 Pin Serial Connectors
Once the PGL files and GPIO mapping table have been downloaded, and the
special serial connector is installed on the printer, the printer will print label_1
when the – key is pressed, label_2 when the Feed key is pressed, and
label_3 when the + key is pressed. The printer performs a form feed when the
Down key is pressed. The Menu and Enter keys are non-functional.
Operator Panel with GPIO Disabled
Figure 220. Operator Panels with GPIO Disabled and Enabled
This works without the GPIO board installed in the printer; all it requires is the
specially wired connector at the serial port. As indicated, it could also be
combined with the Protected Printer example (see page 246). A connector
placed at the GPIO port could disable all this and allow a service engineer to
work on the printer without restrictions.
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Operator Panel with GPIO Enabled