IBM 1120, 1125 manualParity

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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:
Note: Changing this menu item automatically resets the printer.
Parity
Purpose:
To select the parity for serial input and output data frames.
Values:
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:
See also:
PS SmartSwitch;Printer Language
On Printer performs NPA processing. If data is not in NPA format, it is rejected as bad data.
Off Printer does not perform NPA processing.
Auto* Printer examines the data to determine the format and then processes it appropriately.
Even
Odd
None*
Ignore
On* Printer examines data on the serial interface and selects PCL emulation if the data indicates
that is the required printer language.
Off 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.