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Concept Concept 1/19/2022
Products: RP-C, RP-C-EXT-KNX
Functionalities: Hardware
Product version: 3.3, 2022

KNX Modbus Gateway RP-C-EXT-KNX

The KNX Modbus gateway RP-C-EXT-KNX connects to the RP-C controllers and provides an interface between the controller and KNX devices such as push-buttons, sensors, and control units for lights, blinds, and room temperature.

The KNX Modbus gateway allows bi-directional control and monitoring of all parameters and functions of the connected KNX devices. Up to 250 KNX data points (10 KNX devices) can be connected to the KNX Modbus gateway.

The KNX Modbus gateway is a Modbus to KNX interface that connects to one of the RP-C controller's configurable RS-485 ports. The Modbus RTU protocol is used for the communication between the RP-C controller and the KNX Modbus gateway. The RP-C controller acts the Modbus client and the KNX Modbus gateway as a server. The RP-C controller also provides 24 VDC power supply to the KNX Modbus gateway through the RS-485 interface. Maximum one KNX Modbus gateway can be connected to each RP-C controller.

The KNX Modbus gateway provides a galvanic isolation between the RP-C Modbus network and the KNX bus. The KNX Modbus gateway can be used with a standard Schneider Electric KNX power supply to power the KNX devices on the KNX bus.

The KNX Modbus gateway can be programmed through ETS© for installation, configuration, and commissioning of KNX devices. The assignment between KNX objects and Modbus registers is configured in ETS. The completed configuration in ETS is exported to a JSON file, which is then imported into the EcoStruxure Building Operation software to create the Modbus input and output points for the Modbus device proxy object (representation of the KNX Modbus gateway). For more information, see ETS and the KNX Modbus Gateway .

The KNX Modbus gateway is designed for installation on a DIN rail.

The KNX Modbus gateway has two push-buttons and three LEDs on the front to enable local operation of the device and status indication.

KNX Modbus gateway RP-C-EXT-KNX

KNX Modbus gateway RP-C-EXT-KNX

RP-C Modbus

The RP-C Modbus network allows standard Modbus devices and the KNX Modbus gateway (RP-C-EXT-KNX) to be connected to the controller.

For more information, see RP-C Modbus .

KNX Modbus Gateway Screw Terminals and Connector

The KNX Modbus gateway (RP-C-EXT-KNX) is equipped with two 3-position pluggable screw terminal blocks for connection to the RP-C Modbus (RS-485) network and a 2-pole PCB connector for connection to the KNX bus.

For more information, see KNX Modbus Gateway Screw Terminals and Connector .

KNX Modbus Gateway LEDs

There are three LEDs on the front of the KNX Modbus gateway (RP-C-EXT-KNX) and one LED above the front. The LEDs indicate different types of status and modes.

For more information, see KNX Modbus Gateway LEDs .

KNX Modbus Gateway Buttons

There are two push-buttons on the front of the KNX Modbus gateway (RP-C-EXT-KNX) and one button above the front. The buttons are used to activate or deactivate various modes.

For more information, see KNX Modbus Gateway Buttons .

KNX Modbus Gateway Programming Mode

When the KNX Modbus gateway (RP-C-EXT-KNX) is in programming mode, you can assign an individual address to the device on the KNX bus.

For more information, see KNX Modbus Gateway Programming Mode .

KNX Modbus Gateway Manual Operation Mode

The manual operation mode enables you to perform two types of operations:

  • KNX object synchronization

  • KNX read operation

For more information, see KNX Modbus Gateway Manual Operation Mode .

KNX Modbus Gateway Device Installation

The KNX Modbus gateway (RP-C-EXT-KNX) is designed for installation on a DIN rail. The width of the device is 1 unit (18 mm or 0.7 inch).

For more information, see KNX Modbus Gateway Device Installation .

Wiring

The wiring recommendations provide guidance regarding wiring of the Central IO modules, automation servers, BACnet/IP devices, RP controller expansion modules, and Operator Display.

For more information, see Wiring .

KNX Modbus Gateway Regulatory Compliance and Approvals

This section provides information on regulatory compliance and approvals for the KNX Modbus gateway (RP-C-EXT-KNX).

For more information, see KNX Modbus Gateway Regulatory Compliance and Approvals .

Specifications
Electrical
DC input supply voltage
24 VDC
  
Powered by the RP-C
Maximum power consumption
<0.24 W from the KNX bus
  
<0.24 W from the RP-C
Environment
Ambient temperature, operating
-5 °C to +45 °C (23 °F to +113 °F)
Ambient temperature, storage
-25 to +70 °C (-13 to +158 °F)
Humidity
5 to 93 % RH non-condensing
Material
Ingress protection rating
IP 20
Mechanical
Dimensions
18 W x 90 H x 60 D mm (0.7 W x 3.5 H x 2.4 D in.)
Weight
50 g (1.76 oz)
Installation
DIN rail
RP-C Modbus communications
Communication protocol (configurable)
Modbus RTU
Electrical interface
RS-485
  
Maximum total length of the RP-C Modbus (RS-485) network: 72 m (236 ft)
KNX bus communications
Transmission media
Twisted pair (TP)
Maximum APDU length
55
Device model
System B
Hardware
CPU type
ARM Cortex-M0+ single-core
Frequency
14.7456 MHz
SRAM (embedded)
32 KB
Flash memory (embedded)
256 KB
Status indicator
LED (green and red) that shows the KNX communication status
  
LED (green and red) that shows the Modbus RTU communication status
  
LED (green and red) that shows the device mode (operating or programming mode)
  
One LED (red) for programming mode
Buttons
One push-button for synchronization of KNX objects (writing all KNX group objects)
  
One push-button for reading all KNX group objects
  
One button for programming mode
Connectors
4-conductor KNX connectors with PUSH WIRE® connection, 2-pole, dark gray/red
Terminal blocks
3-position pluggable screw terminal block for power supply from the RP-C
  
3-position pluggable screw terminal block for Modbus communication with the RP-C
  
Wire cross-sectional area: 0.34 to 2.5 mm 2 (22 to 14 AWG)
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