Lexmark C750 User Reference Manual page 133

Max Baud Rate
Purpose:
To specify the rate at which data can be received through the infrared port.
Values:
2400 115200
9600 576000
19200 1152000*
38400 4000000
57600
The maximum baud possible for both the printer and the infrared adapter is automatically set during a
power on reset. However, if your printer is situated in a bright or highly reflective environment, you may
experience intermittent communication problems. If you do, select a lower baud for the infrared
connection.
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:
Off Printer does not perform NPA processing.
Auto* Printer examines the data to determine the format and then processes it appropriately.
Changing this menu item automatically resets the printer.
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