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  • New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 1
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 2
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 3
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 4
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 5
    New item   -49.99€Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22 6

    Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22

    Code: DMDBM22
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  • Product description

    Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22

    DMDBM22 – a Sentera Controls DIN rail Power over Modbus (PoM) distribution box: 10 RJ45 connectors with Modbus RTU and 24 VDC and 12 RJ12 connectors with Modbus RTU and integrated 3.3 VDC supply. A single cable supplies both data and power to each device.

    Key idea:
    The box is the “distribution board” of the Sentera Modbus system: power and the Modbus line come into it, and cables fan out in a star from it to sensors, controllers and regulators. No software or configuration.
    Connections
    10 × RJ45 (24 VDC) + 12 × RJ12 (3.3 VDC)
    Max. current
    1.5 A total
    Power supply
    24 VDC via Modbus (PoM)
    Installation / protection
    DIN rail, IP20

    Operating principle

    The box is mounted on a DIN rail, and one RJ45 socket is fed with 24 VDC together with the Modbus RTU (RS485) signal, e.g. from a Sentera power module. Devices are connected to the other sockets: RJ45 (1–2 +24 VDC, 3–4 A, 5–6 /B, 7–8 GND) – 24 VDC powered, RJ12 (1–2 +3.3 VDC, 3 A, 4 /B, 5–6 GND) – 3.3 VDC devices.

    The box generates the 3.3 VDC voltage from 24 VDC. The total distributed current is up to 1.5 A (24 VDC and 3.3 VDC combined), the power is 36 W at 24 VDC and 1 W at 3.3 VDC; no configuration is needed.

    Result – up to 21 devices receive power and Modbus communication from a single input, and green LEDs at the RJ45 and RJ12 sockets immediately show where voltage is present. The operating environment of -30…+85 °C allows the box to be used in unheated panels as well.

    Benefits DMDBM22?
    Neat star-topology Modbus and power distribution in the panel – faster installation with factory-made UTP cables and fewer wiring errors.

    Technical specifications

    Product type Power over Modbus distribution box
    Manufacturer / code Sentera Controls / DMDBM22
    Power supply 24 VDC via Modbus (PoM)
    RJ45 connectors 10 pcs: Modbus RTU + 24 VDC (1–2 +24 VDC, 3–4 A, 5–6 /B, 7–8 GND)
    RJ12 connectors 12 pcs: Modbus RTU + 3.3 VDC (1–2 +3.3 VDC, 3 A, 4 /B, 5–6 GND)
    Max. distributed current 1.5 A total (24 VDC and 3.3 VDC)
    Power 36 W at 24 VDC; 1 W at 3.3 VDC
    Communication Modbus RTU (RS485), A and /B
    Configuration Not required
    Indication Green LEDs: 24 VDC at the RJ45 sockets, 3.3 VDC at the RJ12 sockets
    Installation DIN rail, bottom latch
    Housing ABS, grey RAL 7035
    Protection class IP20
    Operating environment -30…+85 °C, 5–85 % rH non-condensing
    Weight 0.17 kg net
    Compliance WEEE 2012/19/EU, RoHS 2011/65/EU

    Manufacturer documentation

    ✔ Recommended by Elektrotechnikos sprendimai

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

    Main functions

    • 10 × RJ45 with 24 VDC – For Sentera PoM devices – a single UTP cable for data and power.
    • 12 × RJ12 with 3.3 VDC – integrated 3.3 VDC source for devices that need a low voltage.
    • No configuration needed – switch it on and it works.
    • LED indication – the presence of power is visible at a glance.
    • DIN rail – installed in the panel next to the power module.
    • Star topology – each device is connected with its own UTP cable from a single point – easier fault finding.
    • Wide operating range – -30…+85 °C – also suitable for unheated panels.

    Where is it used?

    • Ventilation and HVAC automation panels with many Sentera Modbus devices
    • Power and communication for sensors, sensor-controllers, HVAC controllers and speed controllers
    • Star connection of devices over long distances
    • Systems with 3.3 VDC and 24 VDC Sentera devices
    • Unheated rooftop ventilation unit control panels
    • Schools and offices with many room sensors

    On-demand operation

    For rooftop ventilation unit automation installers.
    Operates at -30…+85 °C, so it suits unheated panels.
    For the control panel assembler.
    22 connectors in a single DIN module replace many terminals and wire joints.
    For designers calculating the PoM power budget.
    The clear 1.5 A total limit allows the number of devices to be calculated in advance.

    Practical application

    If up to nine 24 VDC Sentera devices and several 3.3 VDC devices have to be connected in an unheated rooftop panel, then the DMDBM22 serves them all from a single PoM input at -30…+85 °C, provided the total current does not exceed 1.5 A (36 W at 24 VDC).

    Application guide: how it is used in practice

    The DMDBM22 always distributes the PoM line – only the connected equipment differs:

    Site What is connected Result Installer's note
    Ventilation panel of an office building Sentera power module → RJ45; sensors and controllers → other RJ45 All devices are powered and accessible via Modbus Add up the currents of all devices – ≤1.5 A
    3.3 VDC devices Devices with an RJ12 plug → RJ12 sockets Low-voltage devices receive 3.3 VDC and Modbus Never insert an RJ12 plug into an RJ45 socket
    System with an internet gateway DIG-M-2 / DIGWM → single RJ45 The whole system is accessible via SenteraWeb Include the module current
    Commissioning and adjustment CNVT-USB-RS485 converter → free RJ45 Configuration from a computer The converter does not use the RJ45 power contacts

    How to choose PoM distribution and power supply

    Requirement Recommended model
    6 RJ45 devices, surface mounting, IP65 MDB-M-6 (6 × RJ45, 1.5 A)
    Panel: 10 × RJ45 24 VDC + 12 × RJ12 3.3 VDC, -30…+85 °C DMDBM22 (DIN, 1.5 A) ← this model
    Panel: 10 × RJ45 24 VDC + 12 × RJ12 3.3 VDC (up to 0.3 A), 0…60 °C DLDBM22 (DIN, 1.5 A / 0.3 A)
    24 VDC PoM supply from 85–264 VAC mains + RS485 repeater PDM-8-MB (2 × 24 VDC / 20 W)
    Rule: add up the currents of all connected devices (24 VDC and 3.3 VDC) – the total ≤1.5 A. For outdoor or damp environments choose the MDB-M-6 (IP65), for power from 230 VAC – PDM-8-MB.
    When to choose another solution: for surface mounting and 6 devices – MDB-M-6 (IP65); for PoM power from the mains – PDM-8-MB; when 0…60 °C is sufficient – DLDBM22.

    Pros

    • 22 connectors in one DIN module
    • Integrated 3.3 VDC source
    • No configuration needed
    • LED indication
    • Star topology with UTP cables
    • Wide operating temperature range -30…+85 °C

    Cons / limitations

    • IP20 – in control panel only
    • Total current limited to 1.5 A
    • It does not generate 24 VDC itself – a PoM power supply is required, e.g. PDM-8-MB
    • Mixing up RJ12 and RJ45 plugs can damage 3.3 VDC devices

    Safety and installation notes

    • Installation and connection are to be carried out by a qualified electrician or automation specialist with the power disconnected.
    • Attention: do not insert an RJ12 plug into an RJ45 socket – devices requiring 3.3 VDC may be damaged.
    • Do not exceed a total current of 1.5 A and the specified power limits.
    • Use in an environment of -30…+85 °C, 5–85 % rH, non-condensing.

    Quick selection guide

    Modbus RTU
    10 × RJ45
    12 × RJ12
    24 VDC / 3.3 VDC
    1.5 A
    DIN
    IP20
    Suitable when you need:
    • to distribute Modbus and 24 VDC power to many Sentera devices;
    • to power 3.3 VDC devices via RJ12;
    • to tidy up the panel wiring with a star topology.
    Check before use:
    • the sum of the currents of all devices (≤1.5 A);
    • how many RJ45 and RJ12 connections are needed;
    • the power of the PoM power supply.
    Important reminder: The DMDBM22 is not a power supply – 24 VDC is fed to it from a PoM power module.

    FAQ

    Does it need to be configured?
    No, the box works without software or settings.
    What is the maximum current?
    The total current of the 24 VDC and 3.3 VDC connectors is up to 1.5 A.
    What are the RJ12 sockets for?
    RJ12 sockets are for devices that require 3.3 VDC power and Modbus RTU communication.
    Can it be installed outdoors?
    No, the IP20 enclosure is for panel use only, although the operating temperature reaches -30…+85 °C.
    Where does the box get 24 VDC from?
    24 VDC together with the Modbus signal is supplied over RJ45 from a PoM power supply, for example the Sentera PDM-8-MB.
    What is the difference between DMDBM22 and DLDBM22?
    The number of connectors is the same, but the DMDBM22 operates at -30…+85 °C, while the DLDBM22 operates at 0…+60 °C and in its datasheet the 3.3 VDC current is limited to 0.3 A.

    Modbus RTU distribution box PoM | 10×RJ45 24VDC + 12×RJ12 3.3VDC | 1.5A | DIN rail | IP20 | -30…+85°C | Sentera Controls | DMDBM22

    Sentera DMDBM22 – a Power over Modbus distribution box for DIN rail: 10 × RJ45 24 VDC and 12 × RJ12 3.3 VDC with Modbus RTU, up to 1.5 A, no configuration needed, IP20.

    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.

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