RS485 Extension

The RS485 Extension is designed to integrate devices with RS485 interface.

From the Loxone Library a suitable template for the integration of devices can be imported.

For additional information on how to integrate devices wihout template, please visit:
Communication with RS232/485

The Extension does not support software flow control.

Datasheet RS485 Extension

Table of Contents


The RS485 Extension is installed on a DIN rail in a suitable enclosure.

Connect the power supply, Link communication to the Miniserver and the RS485 data lines.

If there is a GND terminal on the interface of the devices to be controlled, then GND must also be connected.
RS485 devices are daisy-chained, the last RS485 device must be terminated with a 120 Ohm resistor.
For wiring, a wire pair of a Cat 5/6/7 cable is recommended, alternatively another twisted pair cable can be used.

The maximum length of the RS485 bus depends on the baud rate. Longer wire runs result in lower possible baud rate.

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 on the Link Interface.

Diagnostic Inputs

Summary Description Unit Value Range
Online Status RS485 Extension Indicates whether the device can be reached by the Miniserver.
Diagnostics for Air devices
Diagnostics for Tree devices
Diagnostics for Extensions
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

Installation must be carried out by a qualified electrician in accordance with the applicable regulations.

This device must be mounted on a DIN rail in an electrical distribution enclosure to ensure protection against contact, water and dust.

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


Datasheet RS485 Extension