Lexmark Optra T616 Technical Reference - Page 323

8-20 Interfaces Parallel Mode 2 Parallel Mode 2 is a feature available for many Lexmark printers. The factory default setting is On. The timing required by the printer is clearly indicated in "Standard Protocol Data Transfer Sequence" on page 8-16. This is the classic Centronics interface timing. By setting Parallel Mode 2 to Off from the printer operator panel, through MarkVision, or through a PJL command, the printer changes when data is valid. Once Parallel Mode 2 is set to Off, the printer takes data from the host computer at the trailing edge of STROBE. This is the last possible host driven transition where data should be valid. Note: You may find this feature helpful when having data transfer reliability problems. Signal Descriptions STROBE, AUTOFD* Receivers for Most Printers The following diagram illustrates the STROBE, AUTOFD* receivers for most printers. +5V 1.0K ohm ±5% Connector Pin 470 ohm ±5% FCT 2828 150 pF ±20% GND Signal