Converter M-Bus Master / MQTT Client - HD67931-B2-20
Converter M-Bus Master / MQTT Client - HD67931-B2-20
The ADFweb HD67931-B2-20 connects M-Bus meters to MQTT Client communication. It transfers values from the configured M-Bus line to MQTT topics. More
Code: HD67931-B2-20
The ADFweb HD67931-B2-20 connects M-Bus meters to MQTT Client communication. It transfers values from the configured M-Bus line to MQTT topics. More
Code: HD67931-B2-20
ADFweb HD67931-B2-20
M-Bus Master / MQTT Client
The ADFweb HD67931-B2-20 connects M-Bus meters to MQTT Client communication. It transfers values from the configured M-Bus line to MQTT topics.
We will check your selection and prepare a quotation
Send us the device models, required connection and quantity.
Converter applications
Use it to collect data from up to 20 standard M-Bus devices. Select the required measurements and their mapping to the supervisory system; check addressing and bus loading during design.
Technical specifications HD67931-B2-20
| Order code | HD67931-B2-20 |
|---|---|
| Protocol connection | M-Bus Master / MQTT Client |
| Converter roles | MQTT Client; M-Bus Master |
| Interfaces and ports | M-Bus; Ethernet RJ45 |
| M-Bus line capacity | up to 20 standard M-Bus devices |
| Power supply | 18-35 V DC |
| Consumption at 24 V DC, no load / full load | 3.5 W / 4 W |
| Operating temperature | Confirm for the specific hardware version |
| Mounting | 35 mm DIN rail |
| Dimensions of the housing shown (D × W × H) | 60 × 71 × 95 mm |
| Device weight | approximately 200 g |
| Configuration software | SW67931 |
For an older device, check the hardware version and connections against its label.
Communication and configuration
In SW67931, configure M-Bus meter reads, the broker connection and publication of selected values to MQTT topics.
MQTT requires an external broker. This model uses a wired M-Bus line; wireless versions include the frequency in their order code.
Supply and accessories
Please provide the complete order code. If you need a power supply, connection cables or help with configuration, include them in your enquiry. We will confirm the scope of supply and required accessories for your installation in the quotation.
Documentation and software
Diagrams and hardware version

The images help identify the hardware version. When replacing an older unit, compare its label, connectors and dimensions; we will confirm the version to be supplied in the quotation.
Frequently asked questions
Is knowing the two protocols enough?
The device roles, physical interfaces and data to be transferred must also be checked. MQTT requires an external broker. This model uses a wired M-Bus line; wireless versions include the frequency in their order code.
How is this converter configured?
In SW67931, configure M-Bus meter reads, the broker connection and publication of selected values to MQTT topics.
What information should I send to check the selection?
Send the exact device models at both ends, the protocols and communication roles, the number of devices and the required values. For a PLC, include the firmware and method of accessing its data.
FOXON support with selection and ordering
Selection based on your devices
We will review the specific connection, communication roles and required data.
Availability check
Before you place an order, we will confirm current availability and the possible delivery date.
Documentation for the exact order code
We select the documentation and configuration tool using the complete order code.
Accessories for your installation
We will include the requested accessories in the quotation to suit the connection arrangement.
Choosing the correct version
Two devices with the same protocols can have different functions. Check the gateway role on each side, the connectors and the complete order code.
MQTT requires an external broker. This model uses a wired M-Bus line; wireless versions include the frequency in their order code.
Converter enquiry HD67931-B2-20
Provide the order code, quantity and the devices you need to connect. We will check the suitable version and prepare a quotation.
Request the converterTechnical specifications HD67931-B2-20
| Order code | HD67931-B2-20 |
|---|---|
| Protocol connection | M-Bus Master / MQTT Client |
| Converter roles | MQTT Client; M-Bus Master |
| Interfaces and ports | M-Bus; Ethernet RJ45 |
| M-Bus line capacity | up to 20 standard M-Bus devices |
| Power supply | 18-35 V DC |
| Consumption at 24 V DC, no load / full load | 3.5 W / 4 W |
| Operating temperature | Confirm for the specific hardware version |
| Mounting | 35 mm DIN rail |
| Dimensions of the housing shown (D × W × H) | 60 × 71 × 95 mm |
| Device weight | approximately 200 g |
| Configuration software | SW67931 |
For an older device, check the hardware version and connections against its label.