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==== Primary Addressing ==== The primary address is coded as a single byte allowing values between 0 and 255. Addresses 1 to 250 may be assigned to slaves. The other addresses have special purposes: 255 is a broadcast address. A device that receives a message with address 255 never replies to it. Sending REQ_UD2 frames to the broadcast address makes therefore little sense. 254 is also a broadcast address. This time all slaves shall answer requests which may lead to collisions and is only meant for testing purposes. 251 and 252 are reserved and should not be used for now. 0 is used by unconfigured slaves. They can later be assigned to other addresses using secondary addressing. 253 indicates that secondary addressing is being used. <br>
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