Modbus Tcp; Address Map; Points Definition; Knx Tp-1 (Eib) - IntesisBox IBOX-MBS-KNX-100 User Manual

Modbus Server – KNX
®
IntesisBox
Only the lines RX, TX and GND of the EIA232 connector are used (TX/RX+ and TX/RX- for
EIA485).

2.1.4 Modbus TCP

The TCP port to use can be configured (by default 502 is used).
The IP address, subnet mask and default router address to use by IntesisBox
configured.

2.1.5 Address Map

The Modbus address map is fully configurable; any point in the IntesisBox
configured with the desired Modbus register address.

2.1.6 Points definition

Every point defined in the gateway has the Modbus Format, Point and R/W features
associated to it that can be configured. These features are explained in section 5.1.2 Signals
list.

2.2 KNX TP-1 (EIB)

IntesisBox Modbus Server - KNX supports the KNX TP-1 physical layer, as defined in the
KNX standard. It behaves as one more device of the KNX system, with the same
configuration and functional characteristics as other KNX devices.
KNX TP-1 (EIB) bus provides a 30V DC current, which can even directly power certain low-
consumption KNX devices. IntesisBox does not drain any significant current from the KNX
bus - it has a separate own power supply. Another important electrical aspect is that the
KNX TP-1 (EIB) port of IntesisBox is optically isolated (~2500Vrms AC) from all its other
ports (EIA232, EIA485, Ethernet) and power supply.
At logical level, all KNX devices feature an interface of communication objects, by which
their functionality is abstracted. As a basic example, a KNX interface of an AC indoor unit
would typically consist of an interface of datapoints such as "On/Off", "Setpoint
temperature", "Operating mode", etc.
Associations between communication objects from different KNX devices are actually done
by means of so-called group addresses.
KNX telegrams within a working KNX installation are always addressed to a certain KNX
group address. Typically, whenever a communication object on a KNX device changes its
value, the new value is updated to the bus, by sending a "write" telegram addressed to its
associated group address. The rest of KNX devices in the installation that have a
communication object associated to this group address will act accordingly on reception of
the new value.
Other operations are possible. KNX devices can also decide to read the current value of the
communication objects, by sending a "read" telegram to a certain group address (previously
known to be associated to the targeted comm. object). This operation is performed by many
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User's Manual r18 eng
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