NAME

       pt — SCSI processor type driver

SYNOPSIS

       device pt

DESCRIPTION

       The  pt  driver  provides support for a SCSI processor type device.  These are usually scanners and other
       devices using the SCSI link as a communication interface with device specific commands  embedded  in  the
       data stream.

       A SCSI adapter must be separately configured into the system before this driver can be used.

       This device supports read(2) and write(2), and the ioctl(2) calls described below.

IOCTLS

       The  following  ioctl(2)  calls  are  supported  by  the  pt driver.  They are defined in the header file
       <sys/ptio.h>.

       PTIOCGETTIMEOUT  This ioctl allows userland applications to fetch the current pt driver  read  and  write
                        timeout.  The value returned is in seconds.

       PTIOCSETTIMEOUT  This  ioctl  allows  userland  applications  to set the current pt driver read and write
                        timeouts.  The value should be in seconds.

FILES

       /dev/ptN    the Nth processor device.

SEE ALSO

       cam(4)

HISTORY

       The pt driver appeared in FreeBSD 2.1.

Debian                                            March 2, 1995                                            PT(4)