KNX

The KNX I/O Server provides for the control of a KNX installation compliant with the KNX Standard version 2.0.

The communication between HSYCO and the KNX network must employ a KNXnet/IP gateway supporting the Tunneling service.

The KNX framework must be programmed to work properly using the ETS tool.

Each defined KNX group is seen as a datapoint whose value is formatted with respect to its DPT type. Supported DPT types range from DPT 1 to DPT 18. Moreover, it is possible to have virtual datapoints that link a set of datapoints used for the control of devices such as lights, dimmers, automations and thermostats which require several KNX groups for commands and feedback.

Options

ID	Default	Values	Description
gui	true	true	enable automatic support of Web GUI objects to show the system status and intercept control buttons
		false	disable support for the Web GUI
startupevents	false	true	generate IO events also during the driver’s start-up phase
		false	start generating events only after HSYCO is aligned with the current status of the system
discovery	true	true	automatically creates the list of all detected datapoints with type DPT 1 and the defined virtual datapoints in the systemtopo.txt file
		false	auto-detect for devices is disabled
fromevents	false	true	generates events for commands sent on the KNX BUS reporting the source address and the value of the command
		false	disable command events
readaftercommand	false	true	forces the driver to read the value of a datapoint after a command is sent to it
		false	the driver will assume that commands detected on the BUS are always successful, thus no re-reading is performed to set the value of a datapoint
localport		<port_number>	specifies the port used locally by HSYCO to communicate with the KNXnet/IP gateway. This option might be necessary when employing network address translation (NAT)

Configuration

HSYCO needs to know the KNX framework configuration, which can be imported from an ETS4 project file or manually defined.

Refer to KNX Utility page for instruction on how to configure and test the integration.

Datapoints

ID	Value	R/W	Description
connection	online	R	connection established to the gateway and initial reading executed
	offline	R	HSYCO can't connect to the gateway
<datapoint_id>	<value>	R	this datapoint has value <value>
		W	set this datapont to value <value>
<datapoint_id>.from.<source>	<value>	R	a command with value <value> from the device with individual address <source> has been sent to the addressed datapoint. The source address has the format “x.y.z” (e.g. 1.2.87)
light.<N>	0	R	the light is off
		W	turn off the light
	1	R	the light is on
		W	turn on the light
	flip	W	invert the state of the light
	unknown	R	the state of the light is unknown
dimmer.<N>	off	R	the dimmer is off
		W	turn off the dimmer
	on	W	turn on the dimmer
	1% - 100%	R	the dimming level is set to the reported level
		W	set the dimming level to the specified value
	unknown	R	the state of the dimmer is unknown
autom.<N>	up	R	the automation is moving upwards
		W	move the automation upwards
	down	R	the automation is moving downwards
		W	move the automation downwards
	offup	R	the automation is stopped in a open position
	offdown	R	the automation is stopped in the closed position
	stop	W	stop the automation
	unknown	R	the state of the automation is unknown
thermo.<N>.setpoint.temp	<float_value>	W	set the setpoint to the specified value
	up	W	increase the setpoint by 0.5
	down	W	decrease the setpoint by 0.5
thermo.<N>.setpoint	mode	W	switch to the next setpoint mode

Datapoint types and values

The KNX I/O Server supports all datapoint types (DPTs) with main number ranging from 1 to 18.

The value of a datapoint is formatted with respect to its DPT main number. The actual behavior of the datapoint is anyhow dependent on its complete type (i.e. main number and sub number). Examples for the most common cases will be provided, but for a complete reference of all available datapoint types and allowed values we strongly advice to refer to chapter 3/7/2 of the KNX Standard v2.0.

The following paragraphs will show the KNX data format for each DPT as described in the protocol as well as the allowed datapoint values and the corresponding conversion.

Datapoint Type 1 (1 bit, Boolean)

KNX bit-level format:

87654321

b

b = {0, 1}

Datapoint values:

Value	Converts to
0	b = 0
1	b = 1

Example:

For a datapoint with DPT 1.001 (e.g. a switch) a value of '0' corresponds to the 'off' state, while for a datapoint with DPT 1.007 (e.g. a step indicator for a dimmer) it would correspond to the state 'decrease'.

Datapoint Type 2 (2 bits, Control)

KNX bit-level format:

87654321

c

v

c = {0, 1}, v = {0, 1}

Datapoint values:

Value	Converts to
disabled	c = 0, v = 0
0	c = 1, v = 0
1	c = 1, v = 1

Datapoint Type 3 (4 bits, Dimming, Blinds)

KNX bit-level format:

87654321

c

step

c = {0, 1}, step = [000b ... 111b]

Datapoint values:

Value	Converts to
-7 ≤ v < 0	c = 0, step = |v|
0 ≤ v ≤ 7	c = 1, step = v

Example:

For a datapoint with DPT 3.007 (control dimming) a value of '3' corresponds to a 3-steps light increase. The same value for a DPT 3.008 (control blinds) datapoint corresponds to a 3-steps downwards movement. In both cases a value of '0' indicates the 'break' state.

Datapoint Type 4 (8 bit, Character set)

KNX bit-level format:

87654321

char

char = [0 ... 255] (ISO 8859-1 encoding of a character)

Datapoint values:

Value	Converts to
0 ≤ v ≤ 255	char = v

A DPT 4.001 datapoint will only support the values corresponding to ASCII characters (a subset of the ISO 8859-1 standard values), thus only values ranging from 0 to 127 are allowed.

Datapoint Type 5 (8 bits, Unsigned Value)

KNX bit-level format:

87654321

val

val = [0 ... 255]

Datapoint values:

Value	Converts to
0 ≤ v ≤ 255	val = v

Example:

For a datapoint with DPT 5.001 (scaling) a value of '255' corresponds to '100%'. For a datapoint with DPT 5.003 (angle) the same value corresponds to '360°'.

Datapoint Type 6 (8 bits, Signed Value)

KNX bit-level format:

87654321

val

val = [0 ... 255]

Datapoint values:

Value	Converts to
0 ≤ v ≤ 255	val = v

Example:

For a datapoint with DPT 5.001 (scaling) a value of '255' corresponds to '100%'. For a datapoint with DPT 5.003 (angle) the same value corresponds to '360°'.