Connecting field devices or even communicating room thermostats for HVAC room automation to PXC4/5/7 automation stations on KNX PL-Link is fast, simple, and reliable. For initial commissioning and in service cases, you can rely on a powerful “plug and play” mechanism. For engineering and commissioning, only ABT Site is required.

Step 1: Engineering of KNX PL-Link network with ABT Site

  1. Add devices from the library and configure and rename them according to your project guidelines. For a list of available device types, refer to the sections "RDG200KN thermostat range on KNX PL-Link" and "HVAC room operator units and sensors on KNX PL-Link" in: A6V13054432 (PXC4, PXC5 & PXC7 Range Description).
  2. Add a KNX bus power supply if the built-in power supply of 50 mA is not sufficient. By adding an external power supply, the onboard power supply is turned off automatically.


Step 2: Programming

  1. Device charts are automatically provided for room units QMX2/QMX3 and room thermostats RDG200KNX. Remove chart elements that are not needed.
  2. To add more logic to your integration, add programming patterns. For details, refer to the ABT Site online help.
  3. For RDG200KN, add primary functions like change-over group commands, central seasonal compensation (CenSsnCmp24), or central operating mode (CenOpMod24). Each device delivers on BACnet control signal outputs to collect the energy demands.

Step 3a: Offline device assignment

  1. If a device type is unique in the network, no assignment is required.
  2. The KNX serial number is provided on a sticker with each device. Enter this number manually or with a barcode scanner directly into the network view in ABT Site.

Step 3b: Online device assignment

  1. After connecting ABT Site with your automation station, switch every device separately into pairing mode and press the programming button on the KNX PL-Link device to send the KNX serial number to the automation station.
  2. Alternatively, use ABT Go to assign the devices by pressing the programming button.

Step 4: Device commissioning

  1. After the automation stations have been loaded and the KNX serial numbers are defined, the devices are commissioned automatically. There is no additional tool required.
  2. In case you are using RDG200KN room thermostats, all DIP switches must be set to "Off". The configuration of pre-configured RDGs (e.g. by PCT Go) will be overwritten.
  3. If you have a 6-port Pressure Independent Control Valves (PICV) application in use, you need to define the maximum control signal output. Use the calculator in the PCT Go app to calculate the maximum control signal output.
  4. Comment about a temporary restriction for RDG260KN using FW Version 5.6.0 (will be corrected in the next FW version): Parameters P260 and P261 to define maximal position for PICV, can only be set by PCT Go mobile application even when they are visible in ABT Site. After re-configuring the RDG device by ABT Site, these parameters must be set again by PCT Go. We are really sorry about this inconvenience. The RDG264KN is not affected by this restriction.

Replacing KNX PL-Link devices

  • One-by-one device replacements are performed automatically, including configuration. This is the case when only one device is missing on the bus and a new device with the same device type is connected to the network.
  • If more than one device must be replaced on the same network, the devices have to be assigned by ABT Site or PCT Go.