RS232 extension setup

Information on how to install and configure the RS232 Extension

More information about RS232

Technical Data

  • Connection via Loxone Link
  • 1x RS232 Control Extension
  • Adjustable baud rate
  • Adjustable date format
  • Adjustable protocol
  • Configure with Loxone Config
  • Power supply 24VDC
  • Dimensions: 34 x 85 x 49 mm (2 TE)
  • Power consumption approximately 30mA
  • No hardware handshaking
  • Protection: IP20
  • Ambient temperature: 0 to 50°C
Technical Data


  • Mount the RS232 Extension on the DIN rail
  • Connect 24VDC power supply, but do not switch on until the whole installation is completed
    (We recommend looping through the Miniserver)
  • Connect the Loxone Link
  • Connect the RS232 Extension to an RS232 device.
  • Note: If it is the last extension, terminate the Loxone Link with a 120Ω resistor
    (Included with the Miniserver)
  • Turn on the power supply
  • After a few seconds, the left LED will flash green if the extension is already configured, or orange if not


RS232 dimensions

Configuring Extensions

Extensions are connected to the Miniserver with Loxone Link

To add one or more extensions to the program the simplest way is to connect up the extensions to the Miniserver using the Loxone Link and looping power. Then do a search in Loxone Config, which will bring up the Miniserver and all the connected extensions. You can highlight a single extension, give it a name and then click Create device which will add in the highlighted extension. Or you can click on Create all devices which will add all the connected extensions in to the program with the correct serial numbers.

Extensions are not connected to the Miniserver

If there is no physical extensions connected to the Miniserver they cannot be found in the search. However you can add the extensions to the program so you can configure a system before installing. In the configuration software, connect to your Miniserver and download the existing configuration (if there is one) from the Miniserver. Select the 'Devices' drop-down menu on the Periphery tab and select the required extension, then fill in the serial number in the properties.

Entering a serial number

If you are manually adding devices before the Miniserver install has been done, or if an extension has been replaced you need to add the serial number in the properties. Click on the extension in the periphery tree. Enter the serial number of the extension in the properties section. 

Serial number
The serial number is on the back of your extension. You can find the number just below the barcode (see picture).

Save the configuration in the Minisever

After entering your extension's serial number, click on the Miniserver tab and select 'Save in Miniserver'. The controller reboots and after about 10 seconds, both status LEDs on the extension will turn green.

Identify device

If you have installed several extensions of the same type and cannot identify which one is which (for example 2 DMX extensions) then you can use the software to identify a device. Simply click on the device in the periphery tree and the extension will flash red, green and yellow very quickly so you can identify it.

Setting up a Fronius Solar Inverter

The values from a Fronius Inverter can be read using Fronius's RS232 Converter Box and Loxone's RS232 Extension.

Select the Protocol

Connection Parameters: 
Auto-baud rate (2400, 4800, 9600, 14400, 19200), 8 data bits, 1 stop bit.
In order for the sensor values to be transmitted, you must select the 'Fronius' protocol.

Change ID in the Setup Menu

The inverter responds only to a value-request. These requests are saved in the actuators, therefore a pulse at the actuator writes the current value to the corresponding sensor.
In this request-command the inverter's ID is included (which can be changed in the setup menu). By default, a request-command saves the ID 01.

The following measured values are sent with decimal places. The decimal places falsify the measured values to the power of 2 or 3 respectively:

2 Decimal Places:
Get Yield – DAY
Get Yield – YEAR
Get Yield – TOTAL

1 Decimal Place:
Get operating Hours – DAY

These sensor values can be corrected by the divider function block. Please note that the operating time is given in minutes.

Find out more

Contact us


Icon config
Installation and Quick Connection Guide (pdf)


Icon config
Fronius Operating Instructions


Icon config
Read our online documentation for 'Communication with RS232'


Extension EG Declaration of Conformity (pdf)


RoHS Declaration of Conformity (pdf)