RS232 Extension

The RS232 Extension is designed to integrate devices with RS232 interface.

In Loxone Config templates for different devices are available for integration.

Datasheet RS232 Extension

Table of Contents


The RS232 Extension is installed on a DIN rail in a suitable enclosure.

Connect the power supply and Link communication to the Miniserver.

Connect a device with RS232 interface as shown in the example above.

The Extension starts after switching on the power supply, and the status LED will flash orange after a short time when the connection to the Miniserver is established.

Then follow the pairing procedure

Adding devices and templates

Click on the RS232 Extension and then select a device from the templates, the device settings will be applied automatically:

Then the supported sensors and actuators of the selected device are available for programming.

For additional information on how to integrate devices without template, please visit:
Communication with RS232/485

Diagnostic Inputs

Summary Unit Value Range
Online Status RS232 Extension Digital 0/1


Summary Description Unit Value Range Default Value
Serial Number Specifies the serial number of the device.
For Extensions: Enter 'Auto' to automatically pair an extension with unknown serial number.
This can only be used if there is only one Extension of the same type.
Save into the Miniserver, in order to pair the Extension.
Afterwards the program must be loaded from the Miniserver to transfer the actual serial number of the Extension into the program.
- - -
Serial Protocol Selection of the protocol used to decode the data and if available, automatic polling for the device. - - -
Polling cycle Polling cycle for the selected protocol
0 means that no automatic polling will take place.
If no protocol is selected this value is ignored.
s 0...3600 -1
Protocol Data Protocol data depends on the selected protocol.
For Kostal a comma separated list of the addresses.
If no protocol is selected this value is ignored.
- - -
Baud Rate Baud rate in bits per second for the serial connection Bit/s 0...2147483647 9600
Number of data bits Number of data bits of the serial connection. The extension supports only 8 data bits. - 8...8 8
Stop Bits Number of stop bits used (1-2) for the serial communication - 1...2 1
Parity Parity for serial connection - - -
Pause Sets the pause between packets during transmission. s 0...1 0.01
End character Identifier for the end of a received serial data package.
When received the data is passed on to the Miniserver for processing.
Enter the identifier using hex. (e.g. 0x0A)
- - -
Checksum Checksum or frame structure for this connection - - -
Positive acknowledge Reply for a positive acknowledgement of received block
e.g.: 0x06
- - -
Negative acknowledge Reply for a negative acknowledgement of received block
e.g.: 0x15
- - -
Monitor Online Status When selected, you will be notified via System Status or the Mailer if the device is no longer available or goes offline. - - -

Safety Instructions

The installation must be carried out by a qualified technician in accordance with all applicable regulations.

The installation requires a suitable enclosure to ensure protection against contact, water and dust.

The device must not be used as part of safety-critical systems.


Datasheet RS232 Extension