Usage (Communication Specifications); Bacnet; Communication Protocol Specifications; Specifications - Mitsubishi Electric AE-200A Instruction Book

4. Usage (Communication specifications)

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4-1. BACnet

specifications

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BACnet communication specifications are based on ANSI/ASHRAE Standard 135-2010.

4-2. Communication protocol specifications

(1) Overview of protocol
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• Use BACnet /IP based on ANSI/ASHRAE Standard 135-2010 on UDP/IP of Ethernet
• LAN2 is used to connect BACnet
Ether header
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* Ethernet is a registered trademark of Fuji Xerox Co., Ltd.
(2) Ether header
The physical layer is Ethernet
(3) IP header
A Class C private address is recommended
*1 Recommended values (range): [192.168.2.1] to [192.168.254.254]
[192.168.0.0] and [192.168.255.255] should not be used for a LAN2 IP address.
An IP address set using LAN1 should not be used as a LAN2 IP address.
LAN1 and LAN2 network addresses must not be the same.
(4) UDP header
47808 (0xBAC0) is recommended for the default UDP port for unicast and broadcast.
(5) BVLL header
BVLC type (1 octet): 0x81 fixed (BVLL for BACnet
BVLC function (1 octet): 0x0A for unicast
BVLC length (2 octets): Variable (BVLL header (4) + APDU data length)
(The above is a typical example. For details, refer to ANSI/ASHRAE Standard 135-2010.)
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(6) BACnet NETWORK NPCI header
Version (1 octet): 0x01 fixed
Control (1 octet): 0x04 with response message
(The above is a typical example. For details, refer to ANSI/ASHRAE Standard 135-2010.)
(7) APDU for BACnet
Data of 1,024 octets and under.
(Refer to ANSI/ASHRAE Standard 135-2010 for details.)
WT07919X04
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IP header UDP header
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and the specifications are 100BASE-TX.
0x0B for broadcast
0x00 without response message
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BVLL header NPCI header
*1 . The sub-net mask is 255. 255. 255. 0.
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/IP)
11
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APDU