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M-Bus

M-Bus (Meter-Bus)​

This driver supports energy meters and other devices that comply with the M-Bus (Meter-Bus) standard (EN 13757-2 / EN 13757-3). The Controller connects to these devices via an M-Bus Master / Gateway (also known as a level converter).

IMPORTANT

This driver uses the M-Bus protocol. This is a different physical and electrical standard from Modbus (RS485) and requires an M-Bus Master / Gateway.

Wiring​

M-Bus Wiring​

M-Bus is a 2-wire bus system. Unlike RS485, it is typically not sensitive to polarity (the two wires can be swapped).

  1. Connect the Meters:

    • Connect all M-Bus devices in parallel using a 2-wire cable (daisy-chain topology).
    • Consult your meter's manual for the specific M-Bus connection terminals.

  2. Connect the M-Bus Master:

    • The M-Bus line must be connected to an M-Bus Master (also called a level converter or gateway). This device powers the bus and converts the M-Bus signal into a protocol the Controller can read (usually Ethernet/IP).
    • Connect the M-Bus Master to the same network as your Controller.

Configuration​

To ensure the Controller can find your M-Bus devices, each device must have a unique Primary Address.

  • Primary Address:

    • Set a unique address for each meter on the same bus, between 1 and 250.
    • This is typically done via the meter's display menu.
    • Make a note of each device's address.

  • Baudrate:

    • All devices on the same M-Bus bus must be set to the same baudrate (e.g., 2400, 9600).
    • The M-Bus Master / Gateway must also be set to this same baudrate. The default is often 2400.