OPEN 4100 EMS / OPEN 3100 EMS

High-end controller for complex BA projects

With up to 4,000 physical data points, the OPEN 4100 EMS (BACnet) and OPEN 3100 EMS (proprietary) are among the most powerful controllers in the DEOS product range. They are freely programmable or can be programmed using our time-saving libraries and were developed for the realisation of large and complex building automation projects (BA projects) – 100% made in Germany. To ensure security in the building, our cloud-ready DDC controllers are equipped with an innovative firewall according to the highest security standards. In addition, system graphics can be displayed directly on the controller via the integrated HTML5 web server OPENview. The OPEN 4100 EMS and OPEN 3100 EMS are also available as C2 versions in addition to the standard C1 version, which can connect up to 99 OPEN IO modules. This supports the connection of up to 198 OPEN IO modules and, as a hot standby controller, is part of our redundancy solution, which ensures the highest possible operational reliability in your project.


Use the OPEN 4100 EMS (B-BC controller) for complex BACnet projects with many data points or redundancy requirements.


For complex and proprietary projects with many data points or redundancy requirements, use the OPEN 3100 EMS.

System openness

The system openness and the diverse interfaces and protocols make the OPEN EMS controllers exceptionally flexible to use. In order to meet project requirements, they can be extended via the CAN-bus by up to 198 input and output modules. The IO modules can be positioned up to 5 km from the controller.

Time-saving programming

You can choose whether you want to program the OPEN EMS freely or use the preconfigured and time-saving DEOS libraries. By using the template or macro library, programming work can be reduced by up to 90% and programming errors avoided.

Integrated HTML5 web server

The powerful integrated HTML5 web server OPENview is available on every controller from the OPEN EMS product range. You can access them decentrally via the Internet or Intranet. OPENview enables graphical visualisation and operation of your system even via remote access, which is not only simple but also saves you valuable time.

Integrated Service & Security Center

With the OPEN EMS Service & Security Center and the integrated IT security functions, your DDC controllers and your building automation are protected against unauthorised access and cyber attacks from outside. The installation and setup of the firewall is intuitive and can be implemented via preconfigured security modes without any in-depth IT knowledge.

Product highlights

Innovative, powerful, secure!


Guarantees high quality and durability thanks to production on our own innovative SMD production line

Guarantees you maximum flexibility in your projects

Enable easy on-site maintenance without system failures and the serial cabling (daisy chain) of controllers reduces cabling effort

Realise time savings of up to 90% by using DEOS libraries for system programming

Equipped with integrated HTML5 web server OPENview for system visualisation

Highest possible operational reliability due to redundant system structure, HTTPS and integrated firewall

DIN-rail mounting allows easy integration into the switch cabinet on site

Multiple certifications according to international standards such as AMEV / BTL

Ready for use with the new DEOS BMS OPENweb Cloud


Broschüre OPEN EMS Automationsstationen

Brochure OPEN EMS

DEOS Hardware overview download
DEOS Systemtopologie

DEOS System Topology

Poster with DEOS Hardware download

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