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# KNX Binding

The openHAB KNX binding allows to connect to KNX Home Automation (opens new window) installations. Switching lights on and off, activating your roller shutters, or changing room temperatures are only some examples.

To access your KNX bus, you either need a gateway device which is connected to the KNX bus and allows computers to access the bus communication. This can be either an Ethernet (as a Router or a Tunnel type) or a serial gateway. The KNX binding then can communicate directly with this gateway. Alternatively, a PC running KNXD (opens new window) (free open source component software) can be put in between which then acts as a broker allowing multiple client to connect to the same gateway. Since the protocol is identical, the KNX binding can also communicate with it transparently.

# Supported Things

The KNX binding supports two types of bridges, and one type of things to access the KNX bus. There is an ip bridge to connect to KNX IP Gateways, and a serial bridge for connection over a serial port to a host-attached gateway.

# Binding Configuration

The binding itself does not require any special configuration.

# Bridges

The following two bridge types are supported. Bridges don't have channels on their own.

# IP Gateway

The IP Gateway is the most commonly used way to connect to the KNX bus. At its base, the ip bridge accepts the following configuration parameters:

Name	Required	Description	Default value
type	Yes	The IP connection type for connecting to the KNX bus (`TUNNEL` or `ROUTER`)	-
ipAddress	for `TUNNEL`	Network address of the KNX/IP gateway. If type `ROUTER` is set, the IPv4 Multicast Address can be set.	for `TUNNEL`: <nothing>, for `ROUTER`: 224.0.23.12
portNumber	for `TUNNEL`	Port number of the KNX/IP gateway	3671
localIp	No	Network address of the local host to be used to set up the connection to the KNX/IP gateway	the system-wide configured primary interface address
localSourceAddr	No	The (virtual) individual address for identification of this KNX/IP gateway within the KNX bus Note: Use a free address, not the one of the interface. Or leave it at `0.0.0` and let openHAB decide which address to use.	0.0.0
useNAT	No	Whether there is network address translation between the server and the gateway	false
readingPause	No	Time in milliseconds of how long should be paused between two read requests to the bus during initialization	50
responseTimeout	No	Timeout in seconds to wait for a response from the KNX bus	10
readRetriesLimit	No	Limits the read retries while initialization from the KNX bus	3
autoReconnectPeriod	No	Seconds between connect retries when KNX link has been lost (0 means never).	0

# Serial Gateway

The serial bridge accepts the following configuration parameters:

Name	Required	Description	Default value
serialPort	Y	The serial port to use for connecting to the KNX bus	-
readingPause	N	Time in milliseconds of how long should be paused between two read requests to the bus during initialization	50
responseTimeout	N	Timeout in seconds to wait for a response from the KNX bus	10
readRetriesLimit	N	Limits the read retries while initialization from the KNX bus	3
autoReconnectPeriod	N	Seconds between connect retries when KNX link has been lost, 0 means never retry	0
useCemi	N	Use newer CEMI message format, useful for newer devices like KNX RF sticks, kBerry, etc.	false

# Things

# device Things

basic Things are wrappers around arbitrary group addresses on the KNX bus. They have no specific function in the KNX binding, except that if the address is defined, the binding will actively poll the Individual Address on the KNX bus to detect that the KNX actuator is reachable. Under normal real-world circumstances, either all devices on a bus are reachable, or the entire bus is down. If line couplers are installed, physical device addressing might be filtered; in this case please do not specify the addresses for devices on this line. When fetch is set to true, the binding will read-out the memory of the KNX actuator in order to detect configuration data and so forth. This is however an experimental feature, very prone to the actual on the KNX bus.

Name	Required	Description	Default value
address	N	The individual device address (in 0.0.0 notation)	-
fetch	N	Read out the device parameters and address/communication object tables (requires the address)	false
pingInterval	N	Interval (in seconds) to contact the device and set the thing status based on the result (requires the address)	600
readInterval	N	Interval (in seconds) to actively request reading of values from the bus (0 if they should only be read once at startup)	0

Different kinds of channels are defined and can be used to group together Group Addresses. All channels of a device share one configuration parameter defined on device level: readInterval, an optional parameter which indicates if 'readable' group addresses of that Channel should be read periodically at the given interval, in seconds. 'Readable' group addresses are marked with an < in the group address definition of a Channel, see below. All readable group addresses are queried by openHAB during startup. If readInterval is not specified or set to 0, no further periodic reading will be triggered (default: 0).

# Standard Channel Types

Standard channels are used most of the time. They are used in the common case where the physical state is owned by a device within the KNX bus, e.g. by a switch actuator who "knows" whether the light is turned on or off, or by a temperature sensor which reports the room temperature regularly.

Note: After changing the DPT of already existing Channels, openHAB needs to be restarted for the changes to become effective.

# Channel Type "switch"

Parameter	Description	Default DPT
ga	Group address for the binary switch	1.001

# Channel Type "dimmer"

Parameter	Description	Default DPT
switch	Group address for the binary switch	1.001
position	Group address of the absolute position	5.001
increaseDecrease	Group address for relative movement	3.007

# Channel Type "rollershutter"

Parameter	Description	Default DPT
upDown	Group address for relative movement	1.008
stopMove	Group address for stopping	1.010
position	Group address for the absolute position	5.001

# Channel Type "contact"

Parameter	Description	Default DPT
ga	Group address	1.009

# Channel Type "number"

Parameter	Description	Default DPT
ga	Group address	9.001

Note: Using the Units Of Measurement feature of openHAB (Quantitytype) requires that the DPT value is set correctly. Automatic type conversion will be applied if required.

# Channel Type "string"

Parameter	Description	Default DPT
ga	Group address	16.001

# Channel Type "datetime"

Parameter	Description	Default DPT
ga	Group address	19.001

# Control Channel Types

In contrast to the standard channels above, the control channel types are used for cases where the KNX bus does not own the physical state of a device. This could for example be the case if a lamp from another binding should be controlled by a KNX wall switch. If from the KNX bus a GroupValueRead telegram is sent to a *-control Channel, the bridge responds with a GroupValueResponse telegram to the KNX bus.

# Channel Type "switch-control"

Parameter	Description	Default DPT
ga	Group address for the binary switch	1.001

# Channel Type "dimmer-control"

Parameter	Description	Default DPT
switch	Group address for the binary switch	1.001
position	Group address of the absolute position	5.001
increaseDecrease	Group address for relative movement	3.007
frequency	Increase/Decrease frequency in milliseconds in case the binding should handle that (0 if the KNX device sends the commands repeatedly itself)	0

# Channel Type "rollershutter-control"

Parameter	Description	Default DPT
upDown	Group address for relative movement	1.008
stopMove	Group address for stopping	1.010
position	Group address for the absolute position	5.001

# Channel Type "contact-control"

Parameter	Description	Default DPT
ga	Group address	1.009

# Channel Type "number-control"

Parameter	Description	Default DPT
ga	Group address	9.001

# Channel Type "string-control"

Parameter	Description	Default DPT
ga	Group address	16.001

# Channel Type "datetime-control"

Parameter	Description	Default DPT
ga	Group address	19.001

# Group Address Notation

<config>="[<dpt>:][<]<mainGA>[[+[<]<listeningGA>][+[<]<listeningGA>..]]"

where parts in brackets [] denote optional information.

The optional < sign tells whether the group address of the datapoint accepts read requests on the KNX bus (it does, if the sign is there). All group addresses marked with < are read by openHAB during startup. With *-control channels, the state is not owned by any device on the KNX bus, therefore no read requests will be sent by the binding, i.e. < signs will be ignored for them.

Each configuration parameter has a mainGA where commands are written to and optionally several listeningGAs.

The dpt element is optional. If omitted, the corresponding default value will be used (see the channel descriptions above).

# Examples

The following two templates are sufficient for almost all purposes. Only add parameters to the Bridge and Thing configuration if you know exactly what functionality it is needed for.

# Type ROUTER mode configuration Template

knx.things:

Bridge knx:ip:bridge [
    type="ROUTER",
    autoReconnectPeriod=60 //optional, do not set <30 sec.
] {
    Thing device knx_device "knx_device_name" @ "knx_device_group" [
        //readInterval=3600 //optional, only used if reading values are present
    ] {
        //Items configurations
    }
}

# Type TUNNEL mode configuration Template

knx.things:

Bridge knx:ip:bridge [
    type="TUNNEL",
    ipAddress="192.168.0.111",
    autoReconnectPeriod=60 //optional, do not set <30 sec.
] {
    Thing device knx_device "knx_device_name" @ "knx_device_group" [
        //readInterval=3600 //optional, only used if reading values are present
    ] {
        //Items configurations
    }
}

# Full Example

//TUNNEL
Bridge knx:ip:bridge [
    type="TUNNEL",
    ipAddress="192.168.0.10",
    portNumber=3671,
    localIp="192.168.0.11",
    readingPause=50,
    responseTimeout=10,
    readRetriesLimit=3,
    autoReconnectPeriod=60,
    localSourceAddr="0.0.0"
] {
    Thing device generic [
        address="1.2.3",
        fetch=true,
        pingInterval=300,
        readInterval=3600
    ] {
        Type switch        : demoSwitch        "Light"       [ ga="3/0/4+<3/0/5" ]
        Type rollershutter : demoRollershutter "Shade"       [ upDown="4/3/50+4/3/51", stopMove="4/3/52+4/3/53", position="4/3/54+<4/3/55" ]
        Type contact       : demoContact       "Door"        [ ga="1.019:<5/1/2" ]
        Type number        : demoTemperature   "Temperature" [ ga="9.001:<5/0/0" ]
        Type dimmer        : demoDimmer        "Dimmer"      [ switch="5/0/0", position="5/0/2+<5/0/3", increaseDecrease="5/0/4" ]
        Type string        : demoString        "Message"     [ ga="5/3/1" ]
        Type datetime      : demoDatetime      "Alarm"       [ ga="5/5/42" ]
    }
}

//ROUTER
Bridge knx:ip:bridge [
    type="ROUTER",
    ipAddress="224.0.23.12",
    portNumber=3671,
    localIp="192.168.0.11",
    readingPause=50,
    responseTimeout=10,
    readRetriesLimit=3,
    autoReconnectPeriod=60,
    localSourceAddr="0.0.0"
] {}

knx.items:

Switch        demoSwitch         "Light [%s]"               <light>          { channel="knx:device:bridge:generic:demoSwitch" }
Dimmer        demoDimmer         "Dimmer [%d %%]"           <light>          { channel="knx:device:bridge:generic:demoDimmer" }
Rollershutter demoRollershutter  "Shade [%d %%]"            <rollershutter>  { channel="knx:device:bridge:generic:demoRollershutter" }
Contact       demoContact        "Front Door [%s]"          <frontdoor>      { channel="knx:device:bridge:generic:demoContact" }
Number        demoTemperature    "Temperature [%.1f °C]"    <temperature>    { channel="knx:device:bridge:generic:demoTemperature" }
String        demoString         "Message of the day [%s]"                   { channel="knx:device:bridge:generic:demoString" }
DateTime      demoDatetime       "Alarm [%1$tH:%1$tM]"                       { channel="knx:device:bridge:generic:demoDatetime" }

knx.sitemap:

sitemap knx label="KNX Demo Sitemap" {
  Frame label="Demo Elements" {
    Switch item=demoSwitch
    Switch item=demoRollershutter
    Text   item=demoContact
    Text   item=demoTemperature
    Slider item=demoDimmer
    Text   item=demoString
    Text   item=demoDatetime
  }
}

# Control Example

control.things:

Bridge knx:serial:bridge [
    serialPort="/dev/ttyAMA0",
    readingPause=50,
    responseTimeout=10,
    readRetriesLimit=3,
    autoReconnectPeriod=60
] {
    Thing device generic {
        Type switch-control        : controlSwitch        "Control Switch"        [ ga="3/3/10+<3/3/11" ]   // '<'  signs are allowed but will be ignored for control Channels
        Type dimmer-control        : controlDimmer        "Control Dimmer"        [ switch="3/3/50+3/3/48", position="3/3/46", increaseDecrease="3/3/49", frequency=300 ]
        Type rollershutter-control : controlRollershutter "Control Rollershutter" [ upDown="3/4/1+3/4/2", stopMove="3/4/3", position="3/4/4" ]
        Type number-control        : controlNumber        "Control Number"        [ ga="1/2/2" ]
        Type string-control        : controlString        "Control String"        [ ga="1/4/2" ]
        Type datetime-control      : controlDatetime      "Control Datetime"      [ ga="5/1/30" ]
    }
}

Bridge hue:bridge:bridge "Philips Hue Bridge" [
    ipAddress="...",
    userName="..."
] {
    Thing 0210 1 "Color Lamp" [ lightId="1" ]
}

knx.items:

Switch        demoSwitch         "Light [%s]"               <light>          { channel="hue:0210:bridge:1:color", channel="knx:device:bridge:generic:controlSwitch" }
Dimmer        demoDimmer         "Dimmer [%d %%]"           <light>          { channel="hue:0210:bridge:1:color", channel="knx:device:bridge:generic:controlDimmer" }

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