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Konzept

Konzept


Produkte: RP-C, RP-C-EXT-KNX
Funktionen: Hardware
Produktversion: 3.2, 3.3
01.09.2020

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.

You need to configure which RS-485 port (RJ45) on the RP-C controller to use for the Modbus network. You can configure to use either the Sensor Bus port or Room Bus port. Für weitere Informationen siehe RP-C Communication Ports .

 
action_zoom_plus_stroke Screw terminals and connector, KNX Modbus gateway
Abbildung: Screw terminals and connector, KNX Modbus gateway
Screw terminals

The upper and lower screw terminal blocks are used as follows:

  • Upper: Power input from the RP-C through the controller's RS-485 port

  • Lower: Communication with the RP-C over the controller's Modbus network

Tabelle: Screw Terminals, KNX Modbus Gateway

Terminal number

Designation

Usage

RP-C RS-485 Port

RJ45 Pin

Power input

1

Ground connection for supply voltage from the RP-C.

5 a

2

Ground connection for supply voltage. Not connected to the RP-C.

-

3

+

Positive connection for supply voltage (24 VDC) from the RP-C.

4, 7

Modbus

4

Ground connection for Modbus communication with the RP-C.

8 a

5

A

Data line A (RS485+) for Modbus communication with the RP-C.

3

6

B

Data line B (RS485–) for Modbus communication with the RP-C.

6

  1. RJ45 pins 5 and 8 are internally connected.
Connector

The KNX Modbus gateway uses a 4-conductor, 2-pole KNX connector for connection to the KNX bus.

Tabelle: Connector, KNX Modbus Gateway

Connector color

Designation

Usage

Red

+

Positive connection to KNX bus

Dark gray

Ground connection to KNX bus

  • KNX Modbus Gateway RP-C-EXT-KNX
  • Wiring
  • Wire Sizes and Lengths for the KNX Modbus Gateway
  • RP-C Communication Ports