Logo Sentera
Sentera – your partner in HVAC control solutions
Search
Allow us to inform you
Leave us your contact data so that we can communicate with you.

Close

What is PoM or Power over Modbus?

Modbus RTU – how to interconnect Sentera devices
Sentera products share information via Modbus RTU communication. Modbus RTU is a serial communication protocol that uses RS485 technology.

The term ‘PoM’ stands for ‘Power over Modbus’. It refers to a technology that both Modbus RTU communication and the 24 VDC power supply for the connected devices are distributed via one single UTP cable (Unshielded Twisted Pair cable). This makes it possible to connect different HVAC sensors via one cable. By using 3-way splitters, it is possible to create short branches to connect a device to the main line.

Some Sentera sensors have classic terminal blocks. In this case a UTP cable with loose wire ends is required. Sentera -M series HVAC sensors can be connected via one simple RJ45 connector. Sentera 24 VDC power supplies are also available with RJ45 connectors. This makes it possible to interconnect all Sentera devices with UTP cables with RJ45 connectors. This makes wiring more efficient and reduces the risk of wrong connections.

This movie shows how easy it is to crimp an RJ45 connector:

video
Recent news
Date 16/07/2021
Indoor Air Quality in hospitals
Indoor Air Quality in hospitals Why is air quality in hospitals so important? A hospital is a place where both weak and healthy people come into close contact with each other. In Corona times, that is a frightening scenario that requires many precautions to make this possible in safe conditions. Monitoring indoor air quality is one of these precautions. >>>
Date 25/05/2021
CO2 monitoring in schools
CO2 monitoring in schools Sentera CO2 meters help to reduce the spread of the COVID-19 virus in this school in Sint-Niklaas, Belgium. >>>
Date 16/03/2021
CO2 monitoring system to reduce the risk of COVID-19 contamination
CO2 monitoring system to reduce the risk of COVID-19 contamination Fresh indoor air reduces the risk of COVID-19 contaminations. Sentera HVAC sensors check whether there is sufficient fresh air supply. The measurements can be visualised via a 5-inch touchscreen. >>>