Lexmark 12N0011 User's Guide - Page 285

Honor DSR Purpose: To determine whether the printer uses the Data Set Ready (DSR) signal. DSR is one of the handshaking signals for most serial interface cables. Values: Off* All data received by the serial port is treated as valid data. On Only data received while the DSR signal is high is treated as valid. The serial interface uses DSR to distinguish data sent by the computer from data created by electrical noise in the serial cable. This electrical noise can cause stray characters to print. Select On to prevent stray characters from printing. Job Buffering Purpose: To temporarily store jobs on the printer hard disk before printing. Values: Off* On Auto Does not buffer print jobs to the hard disk. Buffers print jobs to the hard disk. Buffers print jobs only if the printer is busy processing data from another input port. Note: Changing the Job Buffering menu item automatically resets the printer. 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* 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. 283