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Python DataLogger for Arexx Multilogger Devices
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Pylarexx - Python DataLogger for Arexx Multilogger Devices

Pylarexx searches the USB bus for Arexx BS-500 / TL-500 devices, and constantly reads sensor data. It can be configured to name the sensors, add calibration values and configure output modules.

At the moment the BS-510 / TL-510 devices are not supported, since i have no such device. New Arexx sensors have id values that exceed 2 bytes and need this newer device. Would be nice, if someone sends me a device or a patch.

The sensors that i have tested are TSN-TH70E and TL-3TSN, both with 2-byte id numbers (<65536). If you have other sensors (CO2, ...), you can send me sensors or debugging output, and i will try to add them.


Pylarexx is tested with Linux. Installing and running pylarexx requires root privileges. The should put the code to /usr/local/pylarexx, a example config to /etc/pylarexx.yml and on systemd based systems, it creates a service.


All configuration is done in /etc/pylarexx.yml. Be careful about indentation and "-", since this has a special meaning in yaml files. See YAML Wikipedia Article.


At sensors you should add your sensors as shown in the example config.


At calibration you can add calibration values. Usually the values for temperature, humidity, ... are computed from the raw value from the sensor with:

value = p0 + rawvalue * p1 + rawvalue² * p2 + ....

With the values List, you can alter p0, p1 .... as shown in the example config.


At output you can add one or more DataListeners and configure them. You can also add one type of DataListener more then one time.

Available output modules (DataListeners):

  • LoggingListener: Uses python logging to print measured values
  • FileOutListener: Appends measured values to a file
    • Parameter: filename default value: /tmp/pylarexx.out
  • RecentValuesListener: Makes recent values of all sensors available to a TCP socket. This can be queried with "nc". Useful for example, if you want to monitor sensor values with nagios/icinga/check_mk
    • Parameter: host IP to listen, default value: localhost
    • Parameter: port TCP Port, default value: 4711


  • Log to Grafana
  • Log to Elasticsearch/Solr
  • Log to mysql/postgres
  • Log to influxdb
  • Log to a REST API
  • ....

Look at to see how to implement new output modules

Other config

At config there are some other configuration options:

  • DetectUnknownSensors: Default: yes. If set to "no", pylarexx will only see the configured sensors. Good if you have other types of sensors, that create ghost entries.


pylarexx is licensed under the Apache License, version 2, see License.txt. The file device.xml is copyrighted by Arexx and is distributed with permission from Arexx

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