Product description

Internet gateway SenteraWeb | Ethernet/Wi-Fi | 2×Modbus RTU | 24VDC PoM | DIN rail | IP20 | Sentera Controls | DIG-M-2

DIG-M-2 – a Sentera Controls internet gateway that connects a single Sentera device or their entire Modbus RTU network to the SenteraWeb cloud. The internet connection is via wired Ethernet or wireless Wi-Fi; mounting – DIN rail, protection class IP20.

Key idea:
The gateway turns local ventilation automation into a remotely maintained system: settings can be changed from the office, data is logged in the cloud, and you learn about a clogged filter or a motor fault from a notification rather than a customer's phone call.

Internet connection
Ethernet or Wi-Fi

Modbus
2 Modbus RTU (RS485) channels

Power supply
24 VDC PoM, Imax 330 mA

Installation / protection
DIN rail, IP20

Operating principle

The module is mounted on a DIN rail and powered with 24 VDC over Modbus (PoM, Imax 330 mA) through the same UTP cable that carries the data; it has 3 RJ45 sockets – for subordinate devices, the main controller or BMS, and Ethernet internet – plus a 24 VDC output for auxiliary devices. The internet connection is via an Ethernet cable or Wi-Fi (2.4 GHz).

On the master Modbus RTU channel the module polls the connected Sentera controllers, sensors and controllers, while on the second (slave) channel it is itself accessible from the main controller or BMS, so SenteraWeb and the existing automation work together. Data is sent using the MQTT protocol, TCP, UDP and HTTP client modes are supported, the real-time clock has a backup battery, and the firmware is updated over the internet. The internal backup memory preserves data if the internet connection is temporarily lost.

Result – via SenteraWeb the setpoints, limits and parameters of connected devices are changed, firmware updates are installed, data is logged, and alerts (e.g. dirty filter, motor fault) arrive without a site visit.

Benefits DIG-M-2?
One module provides remote access to the entire Sentera Modbus system – fewer service visits, faster fault diagnostics and data history for the customer.

Technical specifications

Product type	Internet gateway SenteraWeb
Manufacturer / code	Sentera Controls / DIG-M-2
Power supply	24 VDC via Modbus (PoM), Imax 330 mA
Output for auxiliary devices	24 VDC
Internet connection	Ethernet or Wi-Fi
Modbus	2 Modbus RTU (RS485) channels: for slave devices and for the master controller / BMS
Connections	3 RJ45 sockets: for auxiliary devices / PoM, for the master controller or BMS / PoM, for the internet (Ethernet)
Protocols	MQTT; TCP, UDP and HTTP client modes
Cloud	SenteraWeb
Clock	Real-time clock with backup battery
Update	Firmware is updated over the internet
Reset	PROG P1: jumper 1–2 ≥5 s – reset of Modbus communication parameters; 3–4 – firmware update mode; removing the Wi-Fi network – hold for 4 s
Default IP address	192.168.1.123 (after Wi-Fi reset)
Additionally	Internal backup memory – data is retained if the internet connection drops
Installation	DIN rail
Housing	ABS, UL94-V0, grey RAL 7035
Protection class	IP20
Operating environment	-40…+85 °C, 5–85 % rH non-condensing
Weight	0.13 kg net
Package	package 100 × 75 × 81 mm
Compliance	EMC 2014/30/EU, RED 2014/53/EU (EN 300 328, ETSI EN 301 489-1/-17), EN 60950-1, EN 62311, WEEE, RoHS, EN IEC 63000

Manufacturer documentation

✔ Recommended by Elektrotechnikos sprendimai

Original manufacturer documentation – technical data, wiring diagrams and installation instructions.

Main functions

SenteraWeb access – Configuring and monitoring Sentera devices over the internet.
Two Modbus RTU channels – SenteraWeb and the BMS / master controller can work with the same system at the same time.
Warnings and notifications – e.g. a clogged filter or a motor fault – the message arrives without a site visit.
Data logging – history of measurements and statuses in the SenteraWeb database.
Remote update – firmware and parameters of connected devices are updated via SenteraWeb.
PoM power supply – 24 VDC and Modbus over a single UTP cable; 24 VDC output for auxiliary devices.
MQTT, TCP / UDP / HTTP client – standard internet communication protocols.
Backup memory – if the internet connection is lost, the data is stored in the module.
Real-time clock – with a backup battery – correct data timestamps.

Where is it used?

Ventilation systems with Sentera speed controllers and sensors that need to be monitored remotely
Automation panels – mounting on a DIN rail next to other Sentera DIN modules
Commercial premises, schools, offices – filter and fan status notifications
Agricultural buildings, greenhouses, warehouses without permanent staff
Sites that already have a BMS but also need SenteraWeb access
Service contracts – remote diagnostics and settings changes
Sites where Wi-Fi is unstable – wired Ethernet connection

On-demand operation

For ventilation service companies.
System status is visible from the office, and if the internet connection drops, the data stays in the module's memory.

For commercial building BMS integrators.
The second Modbus channel lets the BMS remain the master controller while also using SenteraWeb.

For building administrators.
Receives filter and fault notifications over a reliable wired Ethernet connection.

Practical application

If an office building BMS already controls Sentera controllers over Modbus, and the service company wants to receive filter contamination notifications, then the DIG-M-2 is installed in the panel between the BMS (slave channel) and the Sentera devices (master channel), connected with an Ethernet cable, and the data goes to SenteraWeb without disconnecting the BMS.

Application guide: how it is used in practice

The DIG-M-2 always sits between the Sentera Modbus network and the internet – only the connected equipment changes:

Site	What is connected	Result	Installer's note
Office, school – ventilation according to CO₂	Sentera CO₂ sensors and speed controllers → Modbus channel for slave devices	Ventilation runs on demand; CO₂ history and settings – SenteraWeb	A unique Modbus address for each device
Building with BMS	BMS → second Modbus channel; Sentera devices → main channel	BMS and SenteraWeb work together without conflicting over the line	Match the BMS channel communication parameters to the BMS
Duct system with filters	Sentera differential pressure transmitter via Modbus	A notification is received when the filter becomes clogged	Set the warning threshold in SenteraWeb
Greenhouse, warehouse, farm building	Sentera temperature / humidity sensors and controllers	The microclimate is monitored remotely, with alarms delivered as notifications	Where Wi-Fi is weak, use an Ethernet cable
Upgrading an existing Sentera system	The module is plugged into an existing PoM Modbus line	The system gets remote access without replacing devices	Check the power reserve of the PoM source

How to choose an internet gateway

Installation location / internet connection	Recommended model
Panel (DIN rail); Ethernet or Wi-Fi	DIG-M-2 (DIN, Ethernet / Wi-Fi, IP20) ← this model
Panel (DIN rail); Wi-Fi only	DIGWM (DIN, Wi-Fi, IP30)
On a wall; Ethernet or Wi-Fi	SIG-M-2 (wall-mounted, Ethernet / Wi-Fi, IP54)
On a wall, more demanding environment; Wi-Fi only	SIGWM (wall-mounted, Wi-Fi, IP65)

Rule: first decide on the installation location (panel – DIN models DIG-M-2 / DIGWM, wall – SIG-M-2 / SIGWM), then the internet connection: if an Ethernet cable can be run on site – choose a model with Ethernet (DIG-M-2, SIG-M-2); if only Wi-Fi is available – DIGWM or SIGWM. For damp or dusty environments – wall-mounted models with IP54 / IP65.

When to choose another solution: for local configuration from a computer – CNVT-USB-RS485-V2 / CNVT-USB-RS485-SET; for PoM power and distribution – PDM-8-MB, MDB-M-6, DMDBM22.

Pros

Remote monitoring and configuration via SenteraWeb
Ethernet or Wi-Fi connection
2 Modbus RTU channels – BMS compatible
Fault and filter notifications
Power over Modbus (PoM) – a single UTP cable
Clock with backup battery, updated via the internet
IP20 enclosure, mounting – DIN rail

Cons / limitations

An internet connection is required on site
Designed for Sentera devices and the SenteraWeb platform
Higher current demand (up to 330 mA) than the DIGWM Wi-Fi module (35 mA)
IP20 – mount in a panel; without a panel – the wall-mounted SIG-M-2 (IP54)

Safety and installation notes

Installation and connection are to be carried out by a qualified electrician or automation specialist with the power disconnected.
Do not connect two circuits to a PoM power supply at the same time – the device and/or the power supply may be damaged.
Use in an environment of -40…+85 °C, 5–85 % rH, non-condensing.
Use the PROG jumpers and the reset switch only as instructed – they change the communication settings and may break the Wi-Fi connection.

Quick selection guide

SenteraWeb

Ethernet / Wi-Fi

2×Modbus RTU

24 VDC PoM

IP20

DIN

Suitable when you need:

to connect Sentera devices to SenteraWeb and monitor them remotely;
to receive filter and fault warnings;
to integrate SenteraWeb with an existing BMS via the second Modbus channel.

Check before use:

whether the installation site has a stable Ethernet or Wi-Fi connection;
whether the PoM power supply has sufficient power reserve;
whether all connected devices have unique Modbus addresses.

Important reminder: The DIG-M-2 is not a controller – it only gives the Sentera Modbus system access to the internet and SenteraWeb.

FAQ

Can it be used together with a BMS?
Yes, the module has a second Modbus RTU channel through which the master controller or BMS accesses it.

How is the module powered?
The module is powered with 24 VDC over Modbus (PoM) through the same UTP cable that carries the data, and draws up to 330 mA.

Can fault notifications be received?
Yes, via SenteraWeb you receive alerts, for example about a dirty filter or a motor fault.

Is there an Ethernet connection?
Yes, the internet can be connected via an Ethernet cable or Wi-Fi (2.4 GHz).

What should I do after changing the Wi-Fi network?
Hold the reset switch for 4 s to break the existing Wi-Fi connection, and the module returns to the factory IP address for a new connection.

Where should it be mounted?
On a DIN rail in a control panel, operating environment -40…+85 °C.

Internet gateway SenteraWeb | Ethernet/Wi-Fi | 2×Modbus RTU | 24VDC PoM | DIN rail | IP20 | Sentera Controls | DIG-M-2

Sentera DIG-M-2 – an internet gateway that connects Sentera Modbus RTU devices to SenteraWeb: Ethernet or Wi-Fi, 2 Modbus channels, 24 VDC PoM, IP20, DIN rail mounting, remote monitoring and notifications.

Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

Attributes

Manufacturer

Sentera controls

CE certificate – a guarantee of safety, quality, and compliance

This product is marked with the CE label, which confirms that it complies with all applicable European Union directives and regulations. CE marking is not just a formality – it is an important indicator of quality and safety, ensuring that the product has been properly assessed, tested, and can be safely used throughout the EU market.

CE certification means that the product has been evaluated according to the main criteria:

Safety requirements – ensures that the product does not pose a risk to the user or the environment
Electromagnetic compatibility (EMC) – the device does not interfere with other equipment and is resistant to external disturbances
Environmental standards – complies with current ecological and material usage requirements
Operational reliability – the product is suitable for long-term use according to its intended purpose

CE marking allows this product to:

be legally supplied and used in all European Union countries
ensure a high level of quality and safety
be used in residential, commercial, and industrial environments

The CE mark is a declaration of the manufacturer’s responsibility, confirming that the product complies with all applicable standards and has been assessed according to EU legislation.

What does this mean for you as a buyer?

Safe use in everyday activities
Reliable performance and reduced risk of failure
Compliance with EU standards and requirements
Suitability for professional solutions

Customer reviews

Love it? Share your thoughts in a review!

Write Review

Cart

Products catalog

Product Catalog

Internet gateway SenteraWeb | Ethernet/Wi-Fi | 2×Modbus RTU | 24VDC PoM | DIN rail | IP20 | Sentera Controls | DIG-M-2

Internet gateway SenteraWeb | Ethernet/Wi-Fi | 2×Modbus RTU | 24VDC PoM | DIN rail | IP20 | Sentera Controls | DIG-M-2

Operating principle

Technical specifications

Manufacturer documentation

Main functions

Where is it used?

On-demand operation

Practical application

Application guide: how it is used in practice

How to choose an internet gateway

Pros

Cons / limitations

Safety and installation notes

Quick selection guide

FAQ

Internet gateway SenteraWeb | Ethernet/Wi-Fi | 2×Modbus RTU | 24VDC PoM | DIN rail | IP20 | Sentera Controls | DIG-M-2

Information