TRB143 how to power MBus line with more than 6 devices

Networking Solutions Question
1

We have ~60 devices with power requirements rated 1T in MBus network. TRB143 is in the middle of the network - 30 devices to left 30 devices to the right.

Any suggestions for specific MBus line powering product, that could work together with TRB143 to support such setup?

3

Greetings, @guntiss ,

Welcome to Teltonika Community!

To better understand the setup and determine the best possible solution, could you please help clarify the following:

  1. Meter type and model

    • What specific M-Bus meters/devices are connected to the TRB143?
    • Could you share the manufacturer and model numbers?

  2. Are the connected M-Bus devices powered directly from the M-Bus line, or do they have an external power source (e.g., battery or mains)?

  3. Number of connected devices

    • How many M-Bus devices are currently connected to the TRB143?
    • How many of them are expected to be powered directly from the bus?

  4. Do you know the M-Bus load or current consumption (in mA or M-Bus loads) of each connected device?

  5. Could you provide a simple diagram or description of the M-Bus network layout (e.g., total cable length, number of branches, or loops)?

  6. Are you using any M-Bus repeaters, level converters, or external M-Bus masters in the installation?

  7. Which firmware version is currently installed on the TRB143?

  8. What is the expected final number of meters that need to be read by the gateway?

Once we have this information, we will be able to evaluate whether the current setup can be optimized or if an alternative architecture (e.g., externally powered meters or additional M-Bus infrastructure) would be more suitable.

Looking forward to your reply.

Best regards,
V.

4

Vilius,

Thanks for many questions. The network load is ~90 Mbus loads. ADFWeb HD67030-B2-80 (for 80 slaves) was able to read only when network split in the half. The question was general - can TRB143 be combined with some other hardware to read more then 6 loads? Your question about MBus repeater I guess is the answer.

5

Greetings, @guntiss ,

I hope you’re doing well,

The TRB143 can directly power up to 6 M-Bus slave devices. This is a hardware power limit - not a protocol one. The M-Bus protocol supports up to 250 slaves per segment, so you simply need to offload the bus powering to an external device.

External M-Bus Power Supply / Repeater might help. Add a dedicated M-Bus repeater between the TRB143 and your meters. The TRB143 handles all communication as master; the repeater powers the bus for all 60 devices.

For 60 devices at 1T each (60 unit loads / ~90 mA). So look for a repeater that is capable of that.

  1. Wire it up
    • TRB143 M-Bus port → Repeater input
    • All 60 meters → Repeater output
    • Use standard 2-wire M-Bus cable (e.g. JYStY N×2×0.8 mm)
    • Max slave distance from repeater: 350 m | Max total cable length: 1,000 m

  2. Assign unique addresses
    • Each meter needs a unique primary address (0–250) or secondary address (serial number)

  3. Configure the TRB143 (Services → M-Bus → Client)
    • Enable the M-Bus service
    • Baud rate: 2400 (default - confirm with your meter datasheet)
    • Parity: Even | Stop bits: 1
    • Add each meter under Devices with its address
    • Create a Data Collecting Group, set your reading frequency, and select JSON as the data type
    • Use the Test Configuration button to verify each meter responds

  4. (Optional) Enable Gateway mode
    If you need to forward M-Bus data over TCP/IP to a SCADA or cloud platform, go to Services → M-Bus → Gateway, enable it, set a listening port, and apply IP filter rules.

For more information, please refer to these wiki articles.
• TRB143 M-Bus Wiki:

• TRB143 Configuration Examples:

Please let us know if you have any further questions.

Best regards,
V.