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What is the maximum cable length for a Modbus RTU network?

For Modbus communication, the total cable length per segment must not exceed 1.000 m. (Total cable length = sum of the main network line and all branches). Here

What cable to use for a Modbus network?

Sentera products share information via Modbus communication. Modbus is a serial communication protocol that uses RS485 technology. Based on that technology,

What is the maximum current in a PoM network?

Sentera developed the concept Power over Modbus or PoM to interconnect Sentera products. The PoM concept means that Modbus data communication and 24 Volt supply

What does ‘IP protection’ mean?

Protection against ingress of solid objects and liquids IP rating stands for “Ingress Protection rating”. However, sometimes, “International Protection rating”

What motor insulation class is required in combination with a fan speed controller or VFD?

The insulation of the motor windings prevents short circuits in the windings or connection of the winding to the protective earth. The class of insulation of a

How to control EC fan speed?

An EC motor or Electronically Commutated motor can be seen as an AC motor with integrated fan speed controller. The EC motor requires an indication of the desir

Kick start versus Soft start - what is the difference?

Kick start and soft start are two different ways to start up a motor or fan. The best acceleration method depends on the application. Applications with high ine

What is the difference between an AC and EC motor?

In HVAC business, an induction motor is often referred to as ‘AC motor’. These motor types have a stator winding to generate the required magnetic field to g

How to regulate AC fan speed?

In general, there are two ways to regulate AC fan speed: 1. Reducing the motor voltageReducing motor voltage reduces both motor speed and motor torque - t

Why measure CO2?

Demand-controlled ventilation based on CO2 measurements Demand-controlled ventilation systems use CO2 concentrations within a building to know whether adequate

Why to measure TVOC or indoor air quality?

Volatile Organic Compounds or VOCs are organic chemicals that become a gas at room temperature. They are the main origin of air pollution at ground level. A com

What is Modbus RTU communication?

Open communication protocol Modbus is an open communication protocol, meaning that it's free for manufacturers to build into their equipment without having to

What is PoM or Power over Modbus?

Many Sentera products can share information via Modbus communication. Modbus is a serial communication protocol that uses RS485 technology. Sentera Modbus-compa

Can I use a Sentera transmitter for agriculture or horticulture applications?

Sentera has products for a wide range of applications. Agriculture is one of those. Sentera products in this category measure CO2, soil moisture, relative humid

What is a potentiometer?

A potentiometer is a device to generate a control signal. A potentiometer is an electronic component that allows you to vary the resistance in a circuit. It co

Can Sentera products communicate with non-Sentera products via Modbus RTU communication?

Modbus is an open communication protocol, meaning that it's free for manufacturers to build into their equipment without having to pay royalties. The Modbus com

How to create an account on SenteraWeb?

1. Go to: https://www.senteraweb.eu/en/Account/Registration 2. Complete the form. Obligatory fields are marked with (*) 3. Click Register

How to set up an installation in SenteraWeb?

1. Log in via: https://www.senteraweb.eu/en/Account/Login 2. Click Add installation 3. Enter the serial number of your Sentera internet gateway in the f

How can I create my e-Commerce account?

The Sentera e-Commerce platform is available in all European countries. Everyone can create a free account on the Sentera e-Commerce platform. How to create y

How can I return purchased products?

Non-HVAC professionals or private persons have the right to return products that they have purchased from Sentera up to 14 days after delivery. HVAC professiona

What is a transformer fan speed controller for AC motors?

Transformer fan speed controllers regulate fan speed in steps by reducing the motor voltage. Usually fan speed can be regulated from low to high speed in 5 step

Where to find price and lead times of Sentera products?

Available stock and lead times (3) of Sentera products are visible for all users of our website. Current stock are the number of items that we currently have on

How many EC fans can I control with a 0-10 Volt signal?

Input impedance EC motor Every power source has a limit, also the source of a 0-10 Volt signal is limited. Sentera expresses the limit of a 0-10 Volt signal as

What is relative humidity?

What is relative humidity? Relative humidity is a way to express how humid the air is. At any given temperature, there is water vapour in the air. Relative humi

How do destratification fans work?

Destratification is a simple, yet effective solution for heating savings in areas with high ceilings like warehouses and communal spaces. A destratification fan

What is a Modbus Network Bus Terminator or NBT?

Disruptions in a communication network can be prevented by using Network Bus Terminators or NBTs. Modbus Network Bus Terminators reduce voltage reflections in t

What should I pay attention to when creating a Modbus RTU network?

What is (RS485) Modbus RTU communication? Modbus RTU is an open serial protocol derived from the master/slave architecture (now client/server) originally develo

What is the difference between VDC and VAC?

Alternating Current (AC) and Direct Current (DC) are the two types of electric currents that coexists in our daily life. They are both used for supplying power

Why is mechanical ventilation important in buildings?

Mechanical ventilation is essential in buildings for several reasons: 1. Air quality: Proper ventilation helps to maintain good indoor air quality by removing

How does an electric autotransformer work?

An electric autotransformer is a type of transformer that has a single winding with multiple voltage taps. It operates based on the principles of electromagneti

What is Baudrate in a Modbus RTU network?

The Modbus RTU (Remote Terminal Unit) protocol is widely used in the HVAC industry and in industrial automation systems for communication between devices. Baudr

What are the advantages of Modbus communication over analogue signals?

Modbus communication offers several significant advantages over traditional analogue signals, particularly in industrial and home and building automation applic

What types of NDIR sensors exist?

General characteristics of all NDIR sensors NDIR (Non-dispersive Infra-red) sensing has become the leading method for measuring CO2 concentration. This techno

What are the key components of an air handling unit?

The main parts of an air-handling unit (AHU) are shown on the drawing below. This picture will be used as an example; however, many other different combinations

What is the best placement for sensors on air handling unit?

Sentera offers a wide range of control solutions for your air-handling units (AHU). These solutions include various sensors, a certain amount of which come pre-

What are the most common types of heat recuperators in AHU and how do they work?

The three most common types of energy recovery heat exchangers (recuperators) in air handling units (AHUs) are: • Plate heat exchangers • Rotary heat ex

How to mount a room sensor?

The room sensors of Sentera are intended for wall installation indoors. The front cover of the sensors is made of ASA (Acrylonitrile Styrene Acrylate) plastic,
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