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dmc(4) [bsd man page]

DMC(4)							     Kernel Interfaces Manual							    DMC(4)

dmc - DEC DMC-11/DMR-11 point-to-point communications device SYNOPSIS
/sys/conf/SYSTEM: NDMC dmc_controllers # DMC11 DESCRIPTION
The dmc interface provides access to a point-to-point communications device which runs at either 1 Mb/s or 56 Kb/s. DMC-11's communicate using the DEC DDCMP link layer protocol. The dmc interface driver also supports a DEC DMR-11 providing point-to-point communication running at data rates from 2.4 Kb/s to 1 Mb/s. DMR-11's are a more recent design and thus are preferred over DMC-11's. The NXMT and NRCV constants in the driver should be increased in this case, as the DMR can accept up to 64 transmit and receive buffers, as opposed to 7 for the DMC. The configuration flags specify how to set up the device, 0 -- full duplex DDCMP (normal mode) 1 -- DDCMP Maintence mode (generally useless) 2 -- DDCMP Half Duplex, primary station 3 -- DDCMP Half Duplex, secondary station Several device error counters are available via "adb", for more information see the adb script /usr/share/adb/dmcstats, or the DMC11 tech- nical manual. The host's address must be specified with an SIOCSIFADDR ioctl, and the destination address specified with a SIOCSIFDSTADDR ioctl, before the interface will transmit or receive any packets. ROUTING
The driver places a HOST entry in the kernel routing tables for the address given in the SIOCSIFDSTADDR ioctl. To use the DMC as a link between local nets, the route to the remote net must be added manually with the route(8) command, or by the use of the routing process routed(8) on each end of the link. DIAGNOSTICS
dmc%d: bad control %o. A bad parameter was passed to the dmcload routine. dmc%d: unknown address type %d. An input packet was received which contained a type of address unknown to the driver. DMC fatal error 0%o. A fatal error in DDMCP occurred, causing the device to be restarted. DMC soft error 0%o. A non-fatal error in DDMCP has occurred. dmc%d: af%d not supported. The interface was handed a message which has addresses formatted in an unsuitable address family. SEE ALSO
intro(4N), inet(4F) BUGS
The current version of the driver uses a link-level encapsulation so that multiple protocol types may be used. It is thus incompatible with earlier drivers, including the 4.2BSD version. 3rd Berkeley Distribution October 22, 1996 DMC(4)

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sane-dmc(5)						   SANE Scanner Access Now Easy 					       sane-dmc(5)

sane-dmc - SANE backend for the Polaroid Digital Microscope Camera DESCRIPTION
The sane-dmc library implements a SANE (Scanner Access Now Easy) backend that provides access to the Polaroid Digital Microscope Camera. DEVICE NAMES
This backend expects device names of the form: special Where special is the UNIX path-name for the special device that corresponds to the scanner. The special device name must be a generic SCSI device or a symlink to such a device. Under Linux, such a device name could be /dev/sga or /dev/sge, for example. IMAGING MODES
The Polaroid DMC supports a number of imaging modes. This driver supports five of the imaging modes: Full Frame This mode corresponds to the 801-by-600 pixel full-color full-frame image. Viewfinder This mode corresponds to the 270-by-201 pixel grey-scale viewfinder image. This image is acquired very quickly. Raw This mode corresponds to the 1599-by-600 pixel "raw" image from the CCD. It is grey-scale, with pixels alternating horizontally between red, green and blue stripes. The pixels are twice as high as they are wide, so the image is distorted. Thumbnail This mode corresponds to the 80-by-60 pixel full-color thumbnail image. Super Resolution This image is a 1599-by-1200 pixel full-color image constructed by filtering and interpolating the "raw" image. The filtering and interpolation is done in software, so this mode is very slow. Also, this mode places restrictions on how the image is read which means that the "preview" mode of xscanimage does not work in Super Resolution mode. (xcam and the non-preview modes of scanimage and xscanimage work fine, however.) OTHER SETTINGS
ASA Setting This setting adjusts the camera's sensitivity. You can choose one of 25, 50, or 100 "equivalent" ASA. Shutter Speed You can select a shutter speed from 8 to 1000 milliseconds. The shutter speed is quantized in units of 32 microseconds. White Balance You can choose one of "Daylight", "Incandescent" or "Fluorescent" white balances. This setting more-or-less corresponds to the "Color Temperature" settings on Polaroid's Windows and Mac software. CONFIGURATION
The contents of the dmc.conf file is a list of device names that correspond to DMC scanners. Empty lines and lines starting with a hash mark (#) are ignored. A sample configuration file is shown below: /dev/scanner # this is a comment /dev/sge FILES
/etc/sane.d/dmc.conf The backend configuration file (see also description of SANE_CONFIG_DIR below). /usr/lib64/sane/libsane-dmc.a The static library implementing this backend. /usr/lib64/sane/ The shared library implementing this backend (present on systems that support dynamic loading). ENVIRONMENT
SANE_CONFIG_DIR This environment variable specifies the list of directories that may contain the configuration file. Under UNIX, the directories are separated by a colon (`:'), under OS/2, they are separated by a semi-colon (`;'). If this variable is not set, the configura- tion file is searched in two default directories: first, the current working directory (".") and then in /etc/sane.d. If the value of the environment variable ends with the directory separator character, then the default directories are searched after the explic- itly specified directories. For example, setting SANE_CONFIG_DIR to "/tmp/config:" would result in directories "tmp/config", ".", and "/etc/sane.d" being searched (in this order). SANE_DEBUG_DMC If the library was compiled with debug support enabled, this environment variable controls the debug level for this backend. E.g., a value of 128 requests all debug output to be printed. Smaller levels reduce verbosity. BUGS
In the "Full Frame" and "Raw" modes, images must be read in units of entire lines. The driver performs no buffering in these modes; if you ask sane_read to read a non-integral number of lines, it may read less than you ask for. If you ask sane_read to read less than a single line, it returns SANE_STATUS_INVAL. In the "Super Resolution" mode, images must be read in units of two lines (3198 pixels or 9594 bytes.) If you try to read less than two lines, you get SANE_STATUS_INVAL. The Super Resolution mode is very slow. In the "Viewfinder" and "Thumbnail" modes, the entire image must be read in one SCSI transfer. In this case, the driver performs buffering and you can read the image in as small an increment as you like. SEE ALSO
sane(7), sane-scsi(5) AUTHOR
David F. Skoll The backend is derived from sane-hp by David Mosberger 13 Jul 2008 sane-dmc(5)
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