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==== Secondary Addressing ==== Unconfigured slaves usually have a primary address of 0 assigned. In this case the master can still address the slave using secondary addressing. Secondary addressing works using two message exchanges. First the master sends a SND_UD frame addressed to primary address 253. The SND_UD frame contains the secondary address of the target slave. The addressed slave replies with a confirmation (single character). This mechanism is called selecting a slave. Next the master can read the slave by sending a regular REQ_UD2 frame again to primary address 253. Only the selected slave will answer the request. The secondary address is a world wide unique ID of the M-Bus device. It is 8 bytes long and consists of the following fields: Identification Number (4 bytes) – A number ranging from 00000000 to 99999999 to identify the meter. Manufacturer ID (2 bytes) – Three letters that identify the manufacturer. Version (1 byte) – Specifies the version of the device. The version is manufacturer specific. Device type (1 byte) – This field codes the device type (e.g. electricity meter, cold water meter) <br>
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