3–76 Operator ManualParallel I/O CategoryThe Parallel Category on your printerhas three parameters that can be changedaccording to user needs. Use the Arrowand Enter keys to select Menu => ConfigMenu => Parallel I/O to get here.POPC (Print On Paper Command)The POPC parameter can be set up so that each time a paper advance commandis received (such as a Line Feed, Form Feed, or Vertical Tab), any data currentlyheld in the buffer will be printed before the command is carried out. The defaultis On.8th BitThe 8th Bit can serve several functions, depending on the software manufacturer.Check your software manual for information concerning the functions of this bit.Data is the default.Bi-DirectionalThis parameter controls the bidirectional operation of the Parallel interface. Thedefault selection is On (enabled).When ON, the Parallel interface operates in IEEE-1284 Bidirectional NibbleMode. This mode enables features dependent on bidirectional “reverse channel”communicaiton via the parallel port, such as HP PJL Status and Windows Plug-n-Play. Note that the host computer or print server attached to the parallel portmust be configured to use IEEE-1284 Nibble Mode, otherwise it may not functioncorrectly with your printer. ECP Mode is not compatible with Nibble Mode.When OFF, the Parallel interface operates in the Centronics Compatibility Mode(“standard” mode). This mode does not support bidirectional communication. Ifthere are parallel interface compatibility problems between the host computerand the printer, setting Bi-Directional = OFF may resolve the problem.Config Menu⇒ Parallel I/O
