Digital communication (e.g. Modbus RTU) offers many advantages. Cable lengths up to 1.000 m are possible. Not only is the requested fan speed transmitted to the motor or fan speed controller but also it is also possible to receive information. Motor status, motor speed, motor temperature, actual motor power, etc. can be monitored on a continuous basis. Since Modbus RTU is an open communication protocol, most HVAC devices with Modbus RTU communication can exchange information. Via the Sentera internet gateway, they can be connected to SenteraWeb – the online platform of Sentera. This universal online HVAC platform makes it possible to monitor connected HVAC devices, to adjust settings and to log data.