Primary address
The counters are addressed via the primary address. This can be set at the device, via manufacturer software, or with the function blocks FB_MBUS_ChangeAdr() and FB_MBUS_General_send().
All meters on a level converter/serial interface must have a unique address (0..250).
Address 0-250: Addresses of the devices
Address 251: not used at present
Address 252: not used at present
Address 253: Use of secondary addressing
Address 254: Send to all M-bus devices with response (E5 hexadecimal). If several devices are connected, all will answer. This leads to data collisions. Therefore, this address should only be used if only one device is connected.
Address 255: Send to all M-Bus devices without response.