1
Description
The ekinex® EK-BO1-TP-RMA interface is a modular
KNX S-mode device that allows bidirectional communi-
cation between the RDZ air handling units, equipped with
control board with RS-485 Modbus communication port,
and the KNX system (TP). Thanks to the interface, the
functions performed by the air handling units can be con-
trolled and monitored by KNX devices. The unit has an
integrated KNX bus communication module and is reali-
zed for mounting on a 35 mm rail. Power is supplied via
the KNX bus.
Function
The interface represents a node on the KNX network
and performs the Master function on the Modbus net-
work to which the control board of the air handling unit
is connected as the only Slave. The interface manages
a bidirectional data flow between Modbus RTU (Remote
Terminal Unit) and KNX. The Modbus registers are read
cyclically and their value can be sent as a communication
object on the KNX bus. The data update on the KNX net-
work can take place cyclically and/or on variation event of
the data acquired by the Modbus network. The interface
acquires the value of KNX communication objects during
the exchange of telegrams on the bus. The acquired va-
lue is converted and written on the appropriate Modbus
register. The configuration is carried out by ETS by me
-
ans of the corresponding application program.
RDZ supported air handling units
The interface supports RDZ air handling units for use in
residential buildings listed in the following table.
Data sheet STEKBO1TPRMA_EN
For more information on RDZ air handling units, MVHR
and dehumidification systems, please refer to the cor
-
responding catalogue and technical documentation on
www.rdz.it.
Main characteristics
• Housing in plastic material
• Mounting on 35 mm rail (according to EN 60715)
• Protection degree IP20 (installed device)
• Safety class II
• Weight 70 g
• 2 modular units (1 unit = 18 mm)
• Dimensions 36 x 94 x 71 mm (WxHxD)
Technical data
Power supply
• 30 Vdc from KNX bus line
• Current consumption (from main bus line) < 13
mA
Environmental conditions
• Operating temperature: - 5 ... + 45°C
• Storage temperature: - 20 ... + 60°C
• Transport temperature: - 20 ... + 60°C
• Relative humidity: 5 - 95% not condensing
Switching, display and connection
elements
The device is equipped with 3 signalling LEDs, a terminal
for connection to the KNX bus line, a 3-pole screw termi-
nal for connection to a Modbus RTU line, a pushbutton
and a programming LED.
Switching elements
Pushbutton (B) for switching between normal operation
and programming mode
Modbus / KNX interface
for RDZ air handling units
Code: EK-BO1-TP-RMA
TP1
S
traffic
R
Error
Modbus / KNX interface for
RDZ air handling units
EK-BO1-TP-RMA
Modbus
Power
RX
TX
green
red
A
B
Family
Function
Installation
CHR
Mechanical ventilation with heat recovery
Horizontal
(ceiling)
WHR
Mechanical ventilation with heat recovery
Verticale
(wall)
UAP PDC
Air renewal with dehumidification
Horizontal
(ceiling)
UC
Air renewal with dehumidification
Horizontal
(ceiling)
1. LED for Modbus traffic
2. LED for device state
3. LED for error signalling
4. LED for KNX programming
A. Modbus terminal block
B. Programming pushbutton
C. KNX terminal block
traffic
R
Error
Modbus / KNX interface for
RDZ air handling units
EK-BO1-TP-RMA
Modbus
Power
RX
TX
green
red
A
B
4
A
1
2
B
C
3
