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       LCDd - LCDproc server daemon


       LCDd  [-hf]  [-c  config] [-d driver] [-i bool] [-a addr] [-p port] [-u
       user] [-w time] [-r level] [-s bool]


       LCDd is the server part of LCDproc, a daemon which listens to a certain
       port  (normally  13666) and displays information on an LCD display.  It
       works with several types and sizes of displays.

       Most settings of LCDd are configured  through  its  configuration  file
       /etc/LCDd.conf,  some  of  them  can  be  overridden using command line
       options.  Before running LCDd you should carefully  read  through  that
       file   and   modify  everything  necessary  according  to  your  needs.
       Otherwise you might encounter LCDd not running properly on your system.

       To make full use of LCDd, a client such as lcdproc(1),  lcdexec(1),  or
       lcdvc is required.


       Available options are:

       -h     Display help screen

       -c config
              Use a configuration file other than /etc/LCDd.conf

       -d driver
              Specify  a  driver to use (output only to first), overriding the
              Driver parameter in the config file's [Server] section.

       -f     Run in the foreground, overriding the  Foreground  parameter  in
              the  config  file's  [Server]  section.   The  default,  if  not
              specified in the config file, is to  daemonize  LCDd  as  it  is
              intended to operate in the background.

       -i bool
              Tell  whether  the  to  enable  (1)  or  disable (0) showing the
              LCDproc server screen  in  n  the  screen  rotation,  overriding
              ServerScreen in the config file's [Server] section.

       -w waittime
              Time  to  pause  at  each  screen  (in  seconds), overriding the
              WaitTime parameter in the config file's [Server] section.

       -a addr
              Bind to network address addr, overriding the Bind  parameter  in
              the config file's [Server] section.

       -p port
              Listen  on  port  port  for incoming connections, overriding the
              Port parameter in the config file's [Server] section.

       -u user
              Run as user user, overriding the User parameter  in  the  config
              file's [Server] section.

       -s bool
              Output  messages  to syslog (1) or to stdout (0), overriding the
              ReportToSyslog parameter in the config file's [Server] section.

       -r level
              Set  reporting  level  to  level,  overriding   th   ReportLevel
              parameter in the config file's [Server] section.

       Currently supported display drivers include:

       bayrad BayRAD LCD modules by EMAC Inc.

       CFontz CrystalFontz CFA-632 and CFA-634 serial LCD displays

              CrystalFontz  CFA-533,  CFA-631,  CFA-633 and CFA-635 serial/USB
              LCD displays

       curses Standard video display using the (n)curses library

       CwLnx  serial/USB displays by Cwlinux (

       ea65   VFD front panel display on Aopen XC Cube EA65 media barebone

              LCD display on the EyeboxOne

       g15    LCD display on the Logitech G15 keyboard

       glcd   generic  driver  for  graphical  LCDs  with  FreeType  rendering
              support.  This driver supports the following sub-drivers (a.k.a.
              connection types):

                     Till  Harbaum's  open   source/open   hardware   GLCD2USB

                     picoLCD 256x64 Sideshow graphic LCD (

              png    Write out screens as PNG images

                     Uses  serdisplib ( for

              t6963  Toshiba T6963 based LCD displays (graphic mode)

              graphical LCDs supported by graphlcd-base

       glk    Matrix Orbital GLK Graphic Displays

              Hitachi  HD44780  LCD  displays.   This  driver   supports   the
              following sub-drivers (a.k.a. connection types):

              4bit   LCD 4bit-mode, connected to a PC parallel port

              8bit   LCD 8bit-mode, connected to a PC parallel port

                     LCD in 4bit-mode through a 4094 shift register

              winamp LCD  in  8bit-mode using WinAmp-wiring, connected to a PC
                     parallel port

                     LCD driven by a  PIC-an-LCD  chip/board  by  Dale  Wheat,
                     connected to a serial port

                     LCD   driven   by   a  PIC16C54-based  piggy-back  board,
                     connected to a serial port

                     LCD driven by an Atmel AVR based board,  connected  to  a
                     serial port

                     ???, connected to a serial port

                     VDR-Wake        module        by       Frank       Jepsen

                     Pertelian X2040 module (

              lis2   LIS2 from VLSystem (, connected to

              mplay  MPlay   Blast   from  VLSystem  (,
                     connected to USB

              usblcd LCD device from Adams IT Services (

                     USB-to-HD44780 converter by BWCT (

                     Till  Harbaum's   open   source/open   hardware   LCD2USB

                     Devices based on Dick Streefland's USBtiny firmware

              uss720 USS-720   USB-to-IEEE  1284  Bridge  (Belkin  F5U002  USB
                     Parallel Printer Adapters)

                     Sprut's   open   source   /   open   hardware   USB-4-all

              ftdi   USB connection via a FTDI FT2232D chip in bitbang mode

              i2c    LCD  in  4-bit  mode  driven  by PCF8574(A) / PCA9554(A),
                     connected via I2C bus

                     Adafruit RGB Positive 16x2 LCD+Keypad for Raspberry Pi

              spi    LCD with KS0073 or equivalent in serial  mode,  connected
                     via SPI bus

                     PiFace   Control   and   Display  for  the  Raspberry  Pi

              ethlcd TCP connection using  open  source/open  hardware  ethlcd

                     LCD driven by the GPIO pins of a Raspberry Pi

              140x32  pixel  VFD  Display  of  the  Intra2net  Intranator 2500

              ICP A106 alarm/LCD board in 19" rack cases by ICP

       imon   iMON       IR/VFD       modules        in        cases        by

              iMON        IR/LCD        modules        in       cases       by

              IRTrans IR/VFD modules in cases  by  Ahanix  (e.g.  MCE303)  and
              possibly        others        May        require        irserver
              ( to be running  for

              Code Mercenaries IOWarrior

       irman  IrMan infrared (input)

       joy    Joystick driver (input)

       lb216  LB216 LCD displays

     20x4 serial LCD displays

       lcterm serial    LCD    terminal   from   Helmut   Neumark   Elektronik

       lirc   Infrared (input)

       lis    L.I.S MCE 2005 20x2 VFD (

       MD8800 VFD displays in Medion MD8800 PCs

              Futuba MDM166A displays

       ms6931 MSI-6931 displays in 1U rack servers by MSI

              MTC_S16209x LCD displays by Microtips Technology Inc

       MtxOrb Matrix Orbital displays (except Matrix Orbital GLK displays)

       mx5000 LCD display on the Logitech MX5000 keyboard

              Noritake VFD Device CU20045SCPB-T28A

              Dumps  the  entire  framebuffer  to  the  serial   port   at   a
              configurable rate.

     USB LCD (PicoLCD 20x4 & picoLCD 20x2)

              LCD displays from Pyramid (

              Watchguard   Firebox   LCD   display  based  on  SDEC  LMC-S2D20

              SED1330/SED1335 (aka S1D13300/S1D13305) based graphical displays

              122x32 pixel graphic displays based on SED1520 controllers

              Driver for Point Of Sale ("POS") devices using various protocols
              (currently AEDEX only)

              Text   VFDs   of   various   manufacturers,  see  LCDproc  user-
              documentation for further details.

              Shuttle VFD (USB-based)

       sli    Wirz SLI driver (unknown)

              STV5730A on-screen display chip

              LCD        devices         from         SURE         electronics

       svga   VGA monitors using svgalib

       t6963  Toshiba T6963 based LCD displays (text mode)

       text   Standard "hard-copy" text display

       tyan   LCD module in Tyan Barebone GS series

       ula200 ULA-200 device from ELV (

              VFD/IR combination in case MonCaso 320 from Moneual

       xosd   On Screen Display on X11

       Multiple  drivers  can  be  used  simultaneously;  thus, for example, a
       Matrix Orbital display (MtxOrb driver) can be combined with an infrared
       driver (irmanin driver).


              LCDd -d MtxOrb -d joy
       The  invocation example above will start LCDd reading its configuration
       from the default configuration file /etc/LCDd.conf but  overriding  the
       drivers  specified  therein  with  the  Matrix  Orbital  driver and the
       Joystick input driver.


       There is a basic sequence:

       1. Open a TCP connection to the LCDd server port (usually 13666).

       2. Say "hello"

       3. The server will return some information on the type
              of display available.

       4. Define (and use) a new screen and its widgets.

       5. Close the socket when done displaying data.

       There are many commands for the client to send to the LCDd server:

       hello  This starts a client-server session with the  LCDd  server;  the
              server  will  return a data string detailing the type of display
              and its size.

       client_set -name name
              Set the client's name.

       screen_add #id
              Add a new screen to the display.

       screen_del #id
              Remove a screen from the display.

       screen_set #id [-name name ]  [-wid  width]  [-hgt  height]  [-priority
       prio]  [-duration  int]  [-timeout  int]  [-heartbeat mode] [-backlight
       mode] [-cursor mode] [-cursor_x xpos] [-cursor_y ypos]
              Initialize a screen, or reset its data.

       widget_add #screen #id type [-in #frame]
              Add a widget of type type to screen #screen.

       widget_del #screen #id
              Delete widget #id from screen #screen.

       widget_set #screen #id data
              Set the data used to define a particular widget  #id  on  screen

       Valid heartbeat mode values (for the screen_set command) are:

       on     Display pulsing heart symbol.

       off    No heartbeat display.

       open   Use client's heartbeat setting. This is the default.

       Valid heartbeat mode values (for the screen_set command) are:

       on     Turn backlight on.

       off    Turn backlight off

       toggle Turn backlight off when it is on and vice versa.

       open   Use client's backlight setting. This is the default.

       blink  Blinking backlight

       flash  Flashing blacklight

       Valid  priority  settings  (used  in  the  screen_set  command)  are as

       input  The client is doing interactive input.

       alert  The screen has an important message for the user.

              an active client

       info   Normal info screen, default priority.

              The screen is only visible when no normal info screens exists.

       hidden The screen will never be visible.

       For compatibility with older versions of clients a mapping  of  numeric
       priority values is also supported:

       1 - 64 foreground

       65 - 192

       193 - (infinity)

       An example of how to properly use priorities is as follows:

       Imagine  you're  making  an  mp3  player  for  lcdproc.   When the song
       changes, it's nice to display the new name immediately.  So, you  could
       set  your  screen's  priority  to  foreground,  wait  for the server to
       display (or ignore) your screen, then set the screen  back  to  normal.
       This would cause the mp3 screen to show up as soon as the one on screen
       was finished, then return to normal priority afterward.

       Or, let's say your client monitors the health of hospital patients.  If
       one  of  the  patients  has  a  heart  attack, you could set the screen
       priority to alert, and it would be displayed immediately.  It  wouldn't
       even  wait  for the previous screen to finish.  Also, the display would
       stay on screen most of the time until the user did something about it.

       Widgets can be any of the following:

       string A text string to display (as is).

       hbar   A horizontal bar graph.

       vbar   A vertical bar graph.

       title  A title displayed across  the  top  of  the  display,  within  a

       icon   A graphic icon.

              A  scrolling  text  display,  scrolling  either  horizontally or

       frame  A container to contain other  widgets,  permitting  them  to  be
              refered  to as a single unit.  A widget is put inside a frame by
              using the -in #id parameter, where #id refers to the id  of  the

       num    Displays a large decimal digit

       Widgets are drawn on the screen in the order they are created.

       In the widget_set command, the data argument depends on which widget is
       being set.  Each widget takes  a  particular  set  of  arguments  which
       defines its form and behavior:

       string x y text
              Displays text at position (x,y).

       title text
              Uses text as title to display.

       hbar x y length
              Displays  a  horizontal  bar  starting at position (x,y) that is
              length pixels wide.

       vbar x y length
              Displays a vertical bar  starting  at  position  (x,y)  that  is
              length pixels high.

       icon x y name
              Displays the icon name at position (x,y).

       scroller left top right bottom direction speed text
              The  text  defined  will scroll in the direction defined.  Valid
              directions are h  (horizontal)  and  v  (vertical).   The  speed
              defines  how many "movements" (or changes) will occur per frame.
              A positive number indicates  frames  per  movement;  a  negative
              number indicates movements per frame.

       frame left top right bottom wid hgt dir speed
              Frames  define  a  visible "box" on screen, from the (left, top)
              corner to the (right, bottom) corner.  The actual  data  may  be
              bigger,  and is defined as wid (width) by hgt (height); if it is
              bigger, then the frame will scroll in the  direction  (dir)  and
              speed defined.

       num x int
              Displays  large  decimal digit int at the horizontal position x,
              which is a normal character x coordinate on  the  display.   The
              special value 10 for int displays a colon.


       If  LCDd seems not to work as expected, try to run it in the foreground
       with reporting level set to maximum and reporting to stderr.  This  can
       be  achieved  without  changes  to the config file by using the command
              LCDd -f -r 5 -s 0


       /etc/LCDd.conf, LCDd's default configuration file


       lcdproc-config(5), lcdproc(1), lcdexec(1)


       Many people have contributed to LCDd.  See the CREDITS  file  for  more

       All  questions should be sent to the lcdproc mailing list.  The mailing
       list, and the newest version of LCDproc, should be available from here:



       The lcdproc package is released as "WorksForMe-Ware".  In other  words,
       it is free, kinda neat, and we don't guarantee that it will do anything
       in particular on any machine except the ones it was developed on.

       It is technically released under the GNU GPL license (you  should  have
       received   the   file,   "COPYING",   with   LCDproc)  (also,  look  on for more information), so you  can  distribute  and
       use  it  for free -- but you must make the source code freely available
       to anyone who wants it.

       For any sort of real legal information, read the GNU GPL  (GNU  General
       Public License).  It's worth reading.

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