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cent(7)								       cent(7)

NAME
       cent - Centronics-compatible interface

DESCRIPTION
       is  a  simple, widely used communication protocol most commonly associ‐
       ated with printers, plotters and scanners.  It is an eight-bit parallel
       data  interface with additional control signals from the host computer,
       and status signals from the peripheral.

       The interface driver does no character processing; that is, it does not
       interpret  the  data being transferred between computer and peripheral.
       Therefore, all bytes sent to or received	 from  a  device  are  handled
       without	alteration.  The interface driver always operates in raw mode;
       therefore, any desired data interpretation must be performed by a  user
       program	(such as the ``lp'' spooler in conjunction with an appropriate
       model file).  The driver supports six  different	 handshake  modes  for
       data  transfer.	 The  last four bits of the minor number of the device
       special file specify the mode used.  The format	of  the	 device	 minor
       number is:

       where each letter after the ``0x'' prefix represents a single hexadeci‐
       mal digit, as follows:

       II   Specifies the instance number of the centronic interface.

       000  Always zero.

       A    Specifies the handshake mode.  The handshake modes are:

		 mode 1	   Automatic handshaking using both ACK and BUSY.
			   Minor number format:

		 mode 2	   Automatic handshaking using only BUSY.
			   Minor number format:

		 mode 3	   Bidirectional read/write used for ScanJet.
			   Minor number format:

		 mode 4	   Stream mode.	 Data is  essentially  transmitted  to
			   the peripheral without any handshaking protocol.
			   Minor number format:

		 mode 5	   Pulsed  mode	 using both ACK and BUSY for automatic
			   handshaking.	 Similar to mode  1  except  that  the
			   data	 strobe	 line, is pulsed for a fixed amount of
			   time by the sender, then released.
			   Minor number format:

		 mode 6	   Pulsed mode, using only BUSY	 for  automatic	 hand‐
			   shaking.   Similar  to  mode 1 except that the data
			   strobe line, is pulsed for a fixed amount  of  time
			   by the sender, then released.
			   Minor number format:

	    Modes  1  and  2  support  most HP ∗Jet series printers (LaserJet,
	    DeskJet, QuietJet, etc.).

AUTHOR
       was developed by HP.

SEE ALSO
       lp(1), ioctl(2), intro(7), lp(7).

			       Workstations Only		       cent(7)
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