Object Identifier

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A BACnetObjectIdentifier


Unique in a given device. Not necessarily internetwork wide. (BACnet Standard - Chapter 12, second paragraph) The Object Identifier of an object in combination with the Object Identifier of the Device is what makes an object unique. Value of 4194303 is not allowed. A value of 4194303 used anywhere as an Object Identifier means that the containing object is not initialized.


The Object Identifier of a device shall be unique network wide. <ref>BACnet 135-2004 Sec 12 Pg 127</ref> This effectively means that the Device Instance is unique in any given BACnet Internetwork.


Application Tag Number of Object Identifier is 12. <ref>BACnet 135-2004 Sec 20.2.1.4</ref>


BACnet Object Identifier (Size = 32 bits)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Object Type (10 bits) Object Instance (22 bits)



References

<references/>


Keyword List
APDU BBMD BVLC BVLL DADR DNET Encoding I-Am LSAP MAC NPCI NPDU NSAP NSDU SA SADR SNET

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