Transcription of BACnet Packet Structure Encoding - kargs.net
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BACnet Packet Structure Encoding - kargs.net
Packet Structure and Encoding Network Layer details Application Layer details Abstract Syntax Notation One ( ). Encoding Application Services and Properties Context Specific and Application Tags Primitive Application Datatypes PDU Types in Detail BACnet Arrays and Lists Command Prioritization 1. Reject, Abort, and Error Network Layer Details NPDU Field Format Version 1 octet Which fields are present is determined control 1 octet by the control octet DNET 2 octets DLEN = 0 denotes broadcast MAC DADR and DADR field is absent DLEN 1 octet DLEN > 0 specifies length of DADR field DADR variable SNET 2 octets SLEN = 0 Invalid SLEN 1 octet SLEN > 0 specifies length of SADR field SADR variable Hop Count 1 octet Message Type 1 octet Vendor ID 2 octets 2. APDU N octets Figure 6-1. NPDU field format. Which fields are present is determined by the bits in the control octet.
3 NPDU Control Octet Bit 7: 1 indicates that the NSDU conveys a network layer message. Message Type field is present. 0 indicates that the NSDU contains a
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