Xerox 340 用户手册

The printer has an asynchronous parallel port that lets you interface with 
PCs.  The parallel port supports uni-directional (default) and bi-directional 
communications.  When you use the parallel port, be sure to type this 
command at the PC (if LPT1 is not available, use LPT2) to disable timeouts:

You can switch to bi-directional communications using either of the 
following methods:

■

Download a PostScript utility to the printer.  Refer to the 
Phaser 340 Drivers and Utilities Printing Reference for more 
information.

■

Use your World Wide Web browser.  Refer to the PhaserShare Status 
Software User Manual for more information.

For bi-directional communications, the parallel port supports two modes: 
Compatibility Mode and Nibble Mode.  The interpretation of interface 
signals depends on the current mode.  Compatibility Mode provides 
host-to-printer communication in a manner compatible with a 
uni-directional interface.  Nibble Mode provides printer-to-host 
communication and may be combined with Compatibility Mode to provide 
bi-directional communication.  

The table shows the parallel port’s connected pins.  Other pins are not 
connected.

1

Busy/PtrBusy

19

Printer

C mode:  Positive true = not ready

for data

N mode:  Data bits 3 then 7, then

busy status

2

Select/Xflag

20

Printer

C mode:  Positive true = online
N mode:  Data bits 1 then 5