IBM Infoprint 1125 User Reference page 163

NPA Mode
Purpose:
To specify whether the printer performs the special processing required for bidirectional
communication, following the conventions defined in the Network Printing Alliance (NPA) Protocol.
Values:
On
Off
Auto*
Parity
Purpose:
To select the parity for serial input and output data frames.
Values:
Even
Odd
None*
Ignore
PCL SmartSwitch
Purpose:
To configure the printer so it automatically switches to PCL emulation when a print job received
through the serial port requires it, regardless of the default printer language.
Values:
On*
Off
See also:
PS
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Printer performs NPA processing. If data is not in NPA format, it is rejected as bad data.
Printer does not perform NPA processing.
Printer examines the data to determine the format and then processes it appropriately.
Note: Changing this menu item automatically resets the printer.
Printer examines data on the serial interface and selects PCL emulation if the data indicates
that is the required printer language.
Printer does not examine the incoming data. The printer uses PostScript emulation to
process the job if PS SmartSwitch is On, or uses the default printer language specified in the
Setup Menu if PS SmartSwitch is Off.
SmartSwitch; Printer Language
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