Difference between revisions of "BACnet MS/TP"

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Starting with [http://www.bacnet.org/Addenda/Add-135-2008ab.pdf Addendum 135-2008ab], 9600 and 38400 are the required baud rates and all of the others (19200, 57600, 76800, and 115200) are optional
 
Starting with [http://www.bacnet.org/Addenda/Add-135-2008ab.pdf Addendum 135-2008ab], 9600 and 38400 are the required baud rates and all of the others (19200, 57600, 76800, and 115200) are optional
 
MS/TP Frame Format
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
{| border="1" cellpadding="10" cellspacing="0"
 
{| border="1" cellpadding="10" cellspacing="0"
|+ align="top" | '''Network Layer Message Type(First Byte of [[NSDU]])'''
+
|+ align="top" | '''MS/TP Frame Format'''
 
|0x55 || Framing 1
 
|0x55 || Framing 1
 
|-
 
|-
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| Data CRC LSByte || if len non-zero
 
| Data CRC LSByte || if len non-zero
 
|}
 
|}
 +
  
 
{{Keyword List}}
 
{{Keyword List}}

Revision as of 08:52, 14 September 2018

BACnet "Master-Slave/Token-Passing" is the optional, RS-485 based physical layer for BACnet. It is based on cheap, relatively slow, serial communications.


Starting with Addendum 135-2008ab, 9600 and 38400 are the required baud rates and all of the others (19200, 57600, 76800, and 115200) are optional


MS/TP Frame Format
0x55 Framing 1
0xFF Framing 2
Frame Type
Dest MAC
Src MAC
Len MSByte
Len LSByte
Header CRC
Data if len non-zero
Data CRC MSByte if len non-zero
Data CRC LSByte if len non-zero


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

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