Product description

Modbus RTU to analog signal converter | 1 output 0-10VDC/0-20mA/PWM | 24VDC PoM | IP65 | Sentera Controls | MDACM1

The MDACM1 is a Sentera Controls converter that turns a Modbus RTU (RS485) command into a single analog 0-10 VDC, 0-20 mA or PWM output signal. This allows a BMS or Sentera controller to control, via Modbus, devices that understand only an analog signal – e.g. EC fans, actuators and frequency converters.

Key idea:
The converter is a bridge between digital automation and "analog" equipment: there is no need to replace an EC fan or actuator just because it has no Modbus – it is enough to write a value to a register.

Outputs
1 × 0-10 VDC / 0-20 mA / PWM

Control
Modbus RTU (RS485) – holding registers

Power supply
24 VDC PoM, Imax 30 mA (max. 0.72 W)

Installation / protection
Surface-mounted, IP65

Operating principle

The converter is surface-mounted with two screws through Ø3.4 mm holes and plugged into the Modbus RTU line with an RJ45 connector, over which it receives a 24 VDC supply (Power over Modbus, Imax 30 mA, max. 0.72 W); instead of RJ45, terminals VIN, GND, A, /B can be used, but not both together. The mode of output AO1 is selectable: 0-10 VDC (min. load 50 kΩ), 0-20 mA (max. load 500 Ω) or 1 kHz PWM (open collector with an external resistor and a 3.3–30 VDC source, or a 12 VDC level).

The master unit – a Sentera RDPU controller or any BMS module capable of writing to Modbus holding registers – writes the desired value, and the converter reproduces it at output AO1. The blue LED lights when powered and blinks during Modbus communication.

Result – a single analog device gets Modbus control right on site, because the IP65 enclosure needs no panel. Parameters are changed with the 3SModbus software or the Sensistant Modbus configurator, and the firmware is updated via Modbus RTU.

Benefits MDACM1?
Allows analog equipment to be controlled from a Modbus system without additional controllers and without long analog cables throughout the building.

Technical specifications

Product type	Modbus RTU to analog signal converter
Manufacturer / code	Sentera Controls / MDACM1
Series	MDACM1 (1 output) / DDACM-03, DDACM-I3 (3 outputs)
Power supply	24 VDC via Modbus (PoM), Imax 30 mA (max. 0.72 W)
Analog outputs	1 (AO1), 0-10 VDC / 0-20 mA / PWM
0-10 VDC output	min. load 50 kΩ
0-20 mA output	max. load 500 Ω
PWM output	1 kHz, min. load 50 kΩ; open collector (external resistor and 3.3–30 VDC source) or 12 VDC level
Communication	Modbus RTU (RS485), RJ45 (PoM) or terminals VIN, GND, A, /B
Configuration	3SModbus software, Sensistant Modbus configurator; firmware update via Modbus RTU
Indication	Blue status LED (lit – power, blinking – Modbus communication)
Installation	surface-mounted, 2 holes Ø3.4 mm
Wires	up to 1.5 mm², strip length 8 mm
Protection class	IP65 (EN 60529)
Operating environment	-10…+60 °C, 5–85 % rH non-condensing
Weight	0.15 kg net
Compliance	EMC 2014/30/EU, 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

Selectable output type – 0-10 VDC, 0-20 mA or PWM – suitable for EC fans, actuators and frequency converters.
IP65 enclosure – mounted right at the controlled device, even outside a panel.
Power over Modbus – 24 VDC and data over a single UTP cable – no separate power supply needed at the transmitter.
Control via registers – the master controller or BMS simply writes the value to a holding register.
Update over the network – firmware is updated over Modbus RTU.
Terminal connection – terminals VIN, GND, A, /B can be used instead of RJ45.
Blue status LED – lit – power is present, blinking – Modbus communication is in progress.

Where is it used?

EC fan control from the BMS via Modbus
Control of actuators, valves and dampers with a 0-10 VDC / 0-20 mA signal
Analog speed setpoint for frequency converters
Sentera RDPU controller systems with analog equipment
Retrofit where older equipment has no Modbus
A single EC fan in a technical room without a control panel
Retrofits where a single old device needs Modbus control

On-demand operation

For ventilation installers.
A single IP65 converter is mounted directly at the EC fan or actuator, without a panel.

For retrofit contractors.
Gives a single old analog device Modbus control with minimal wiring.

For Sentera RDPU system integrators.
The RDPU converts a Modbus command into a 0-10 VDC, 0-20 mA or PWM signal for a single device.

Practical application

If an EC fan with a 0-10 VDC input in a technical room has to be controlled from a Sentera RDPU over Modbus, then the MDACM1 in an IP65 housing is mounted next to the fan, powered from the PoM line (up to 30 mA), and on output AO1 reproduces the 0-10 VDC signal set by the register.

Application guide: how it is used in practice

The MDACM1 always receives its command via Modbus – only the equipment connected to the output differs:

Site	What is connected	Result	Installer's note
Supply / extract EC fan	EC fan 0-10 VDC input → output (0-10 VDC mode)	Fan speed controlled from the BMS or RDPU	Check that the load is ≥50 kΩ
Damper or valve actuator	Actuator 0-10 VDC or 0-20 mA input → output	The position is changed with a Modbus command	In 0-20 mA mode the load must not exceed 500 Ω
Frequency converter	Converter analog speed input → output	Pump or fan speed from the BMS	When the transmitter potentials differ – choose DDACM-I3
Equipment with a PWM input	PWM 1 kHz output (open collector or 12 VDC)	Control by PWM signal from Modbus	An open collector requires an external resistor and a 3.3–30 VDC source

How to choose a signal converter

Task	Recommended model
Modbus → 1 analog output, surface mounting, IP65	MDACM1 (1 × 0-10 V / 0-20 mA / PWM) ← this model
Modbus → 3 analog outputs, DIN rail	DDACM-03 (3 outputs, non-isolated)
Modbus → 3 galvanically isolated outputs, DIN	DDACM-I3 (3 isolated outputs)
8 analog inputs → Modbus, DIN	DADCM-08 (4 Ai/Di + 4 Ai)
4 analog + 4 temperature (PT500/PT1000) inputs → Modbus	DADCM-44 (4 Ai/Di + 4 Ti)

Rule: count how many analog signals need to be controlled at one point: 1 – MDACM1 (IP65, at the device), 2–3 – DDACM-03 in the panel; if the controlled equipment is powered from another source or there is a risk of interference – DDACM-I3 with galvanically isolated outputs. To read analog signals onto Modbus use the DADCM series.

When to choose another solution: for reading analog sensor signals onto Modbus – DADCM-08 / DADCM-44; for digital signals and relays – DIO-M-D4 / DIO-M-R2.

Pros

0-10 VDC / 0-20 mA / PWM in one
Power over Modbus (PoM)
Configuration with the 3SModbus software
Firmware update over the network
IP65 – installed next to the equipment
Compact

Cons / limitations

A master Modbus device (RDPU, BMS) that writes the registers is required
Has no control logic of its own – it only converts the signal
Only 1 output – for three outputs DDACM-03 or the isolated DDACM-I3

Safety and installation notes

Installation and connection are to be carried out by a qualified electrician or automation specialist with the power disconnected.
Connect the device via RJ45 or via terminals – not both at the same time.
Do not exceed the power of the Power over Modbus (PoM) supply – add up the currents of all devices powered on the line.
Do not exceed the output load limits: 0-10 VDC ≥50 kΩ, 0-20 mA ≤500 Ω.
Use in an environment of -10…+60 °C, 5–85 % rH, non-condensing.

Quick selection guide

Modbus RTU

1× 0-10 VDC / 0-20 mA / PWM

24 VDC PoM

IP65

Suitable when you need:

to control an EC fan, actuator or frequency converter from a Modbus system;
to avoid long analog cables across the building;
to connect analog equipment to a Sentera RDPU or BMS.

Check before use:

the input type (V, mA or PWM) and the load of the controlled equipment;
how many outputs are needed at one point;
whether the system has a master Modbus device that writes registers.

Important reminder: The MDACM1 is not a controller – its output value is set by a BMS, a Sentera RDPU or another Modbus master device.

FAQ

What determines the output value?
The value is written to the holding registers by the master Modbus device, for example a Sentera RDPU or a BMS controller.

Can an EC fan be controlled?
Yes, via the 0-10 VDC or PWM output, if the fan has such a control input.

Is a separate supply required?
No, the transmitter is powered with 24 VDC over Modbus (PoM) and draws up to 30 mA (0.72 W).

Can terminals be used instead of RJ45?
Yes, terminals VIN, GND, A and /B can be used, but not together with the RJ45 connector.

How many outputs does the MDACM1 have?
MDACM1 has a single output AO1; for three outputs choose DDACM-03 or DDACM-I3.

Can it be mounted outside a panel?
Yes, the IP65 enclosure is fixed to a surface with two screws through Ø3.4 mm holes.

Modbus RTU to analog signal converter | 1 output 0-10VDC/0-20mA/PWM | 24VDC PoM | IP65 | Sentera Controls | MDACM1

Sentera MDACM1 – Modbus RTU to analog signal converter: 1 output 0-10 VDC / 0-20 mA / PWM, 24 VDC PoM, IP65, surface mounting – for controlling EC fans and actuators from a BMS.

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

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Product Catalog

Modbus RTU to analog signal converter | 1 output 0-10VDC/0-20mA/PWM | 24VDC PoM | IP65 | Sentera Controls | MDACM1

Modbus RTU to analog signal converter | 1 output 0-10VDC/0-20mA/PWM | 24VDC PoM | IP65 | Sentera Controls | MDACM1

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 a signal converter

Pros

Cons / limitations

Safety and installation notes

Quick selection guide

FAQ

Modbus RTU to analog signal converter | 1 output 0-10VDC/0-20mA/PWM | 24VDC PoM | IP65 | Sentera Controls | MDACM1

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