Printronix L5020 - Manual (Page 69)

Centronics Parameters
69
Paper Inst (Instruction) Polarity
Values: Standard (default) or Inverted.
This parameter must be set to match the PI line signal polarity of
your host computer.
The Paper Instruction line (PI line) controls paper motion.
PE (Paper Empty) Polarity
Values: Standard (default) or Inverted.
This parameter must be set to match the PE signal polarity of your
host computer.
During printing, if a paper out, paper jam, or cover open error
occurs, the printer sends a Paper Empty (PE) signal to the host
telling it not to send any more data.
NFAULT/PE Ctl
Values: Act Together (default) or Act Separate.
This parameter must be set to match your host computer.
The NFAULT/PE Control parameter controls the operation of the
No Fault (NFAULT) and Paper Empty (PE) signals sent to the host
computer.
• When set to Act Together, the two signal lines work together:
When NFAULT is high, PE is low.
• When set to Act Separate, the printer sets the two signal lines
independently: Paper faults control the state of the PE signal,
and all other faults control the state of the NFAULT signal.