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+Content:
+-------
+
+1    HMCCU Introduction
+1.1    HMCCU Description
+1.2    HMCCU Requirements
+2    HMCCU Usage
+2.1  HMCCU Set Commands
+2.2  HMCCU Get Commands
+2.3  HMCCU Attributes
+2.4  HMCCU Parameter File
+
+------------------------------------
+1 HMCCU Introduction
+------------------------------------
+------------------------------------
+1.1 HMCCU Description
+------------------------------------
+
+The modules HMCCU and HMCCUDEV provide a simple interface between FHEM and
+a Homematic CCU2. HMCCU is the IO device for the communication with the CCU.
+HMCCUDEV is used to define client devices.
+The states and values of CCU devices and variables are not updated automatically.
+You have to define an AT device to update the values.
+
+------------------------------------
+1.2 HMCCU Requirements
+------------------------------------
+
+The module HMCCU requires the XML-API CCU addon (version >= 1.10). The FHEM
+Perl module requires the package XML::Simple.
+
+
+------------------------------------
+2 HMCCU Usage
+------------------------------------
+
+Define a new IO device for communication with Homematic CCU:
+
+   define <name> HMCCU <hostname_or_IP>
+
+
+--------------------
+ HMCCU Set commands
+--------------------
+
+If attribute stateval is set the specified string substitutions are applied
+before setting the device state or variable or datapoint values.
+
+Set state of a CCU device:
+
+   set <name> devstate <ccudev>:<channel> <value>
+
+Set value of a CCU device datapoint:
+
+   set <name> datapoint <ccudev>:<channel>.<datapoint> <value>
+
+Set value of a CCU system variable:
+
+   set <name> var <variable> <value>
+
+   The variable must exist in CCU.
+
+Execute CCU program:
+
+   set <name> execute <program>
+
+   The program is executed even it's deactivated in CCU.
+
+Clear CCU alarms:
+
+   set <name> clearmsg
+
+
+--------------------
+ HMCCU Get commands
+--------------------
+
+If attribute ccureadings is set to 1 the results of the get commands
+are stored in readings. The reading names correspond to the CCU data-
+points, including device and channel. The format of the reading names
+is device:channel.datapoint.
+If attribute ccureadings is set to 0 the results of the get commands
+are displayed in the browser window.
+Some get commands allow an optional parameter reading. If this para-
+meter is specified the CCU value is stored using this reading name.
+With attribute 'substitute' you can define expression which are sub-
+stitute by strings before CCU values are stored in readings.
+
+Get values of channel datapoints:
+
+   get <name> channel <channel>[.<datapoint_exp>] 
+
+   If datapoint is not specified all datapoints will be read. The 
+   commands accepts a regular expression as parameter datapoint.
+
+Get value of datapoint:
+
+   get <name> datapoint <ccudevice>:<channel>.<datapoint> [<reading>]
+
+Get state of channel:
+
+   get <name> devstate <ccudevice>:<channel> [<reading>]
+
+   Specified channel must contain a datapoint 'STATE'.
+
+Get multiple devices / channels / datapoints:
+
+   get <name> parfile [<parfile>]
+
+   If attribute 'parfile' is set parameter <parfile> can be omitted.
+   See parameter file description below.
+
+Get CCU variable values:
+
+   get <name> vars <varname_exp>
+
+   Variable name can be a regular expression.
+
+
+------------------
+ HMCCU Attributes
+------------------
+
+Control reading creation (default is 1):
+
+   attr <name> ccureadings { 0 | 1 }
+
+Remove character from CCU device or variable specification in set
+commands:
+
+   attr <name> stripchar <character>
+
+Specify name of parameter file for command 'get parfile':
+
+   attr <name> parfile <parfile>
+
+Specify text substitutions for values in set commands:
+
+   attr <name> stateval <text1>:<subtext1>[,...]
+
+Specify text substitutions for values returned by  get commands:
+
+   attr <name> substitute <regexp1>:<text1>[,...]
+
+
+-----------------------
+ HMCCU Parameter files
+-----------------------
+
+A parameter file contain a list of CCU datapoint channel or datapoint
+definitions. Each line can contain a text substitution rule. The format
+is:
+
+  <ccudevice>:<channel>[.<datapoint_exp>] [<regexp1>:<subtext1>[,...]]
+
+Empty lines and lines starting with a '#' are ignored.
+