Part
2. Functional Specifications
22
Design Guide
DCM014A51
2.2
BACnet
Network Number
1. A
BACnet
Client access the virtual
BACnet
device of an indoor unit by specifying the
BACnet
network number mapped to the virtual
BACnet
network.
2.
BACnet
network numbers must be a unique number on the
BACnet
network and settable in the
range defined in the
BACnet
specifications (1 to 65534) default is 100.
2.3 Device ID (Device Instance Number)
1. The Device ID must be a unique number per indoor unit and on the
BACnet
network. The
setting range is 0 to 4194303.
2. The following Device ID is recommended to be used as the default for the System Device.
a. For the Device ID:
1.
53
0000 → 53 represents Daikin’s
BACnet
vendor ID.
2. 53
0000
→ 0000 represents no port or group address assigned
2. The following Device ID calculation is recommended to be used as the default for each indoor
unit unless otherwise specified by the BMS integrator. The default Device ID should follow the
structure 53XXXX.
a. For the Device ID 531100:
1.
53
1100 → 53 represents Daikin’s
BACnet
vendor ID.
2. 53
1
100 → 1 represents the port number (1 =
iTM
, 2 – 8 =
iTM
Plus Adaptor address).
3. 531
100
→ 100 represents the DIII-Net group address 1-00.
3. The following Device ID calculation is recommended to be used as the default for each outdoor
unit unless otherwise specified by the BMS integrator. The default Device ID should follow the
structure 53XXX.
a. For Device ID 5311
1.
53
11 → 53 represents Daikin’s
BACnet
vendor ID.
2. 53
1
1 → 1 represents the port number (1 =
iTM
, 2 – 8 =
iTM
Plus Adaptor address).
3. 531
1
→ 1 represents the outdoor unit tag number CU-
1.
2.4 What is a MAC Address?
1. The MAC address is a unique physical address to identify a network device.
2. Each physical medium in a network has a MAC address whose length varies depending on the
physical medium.
3. MAC addresses used for physical media are defined by the
BACnet
specifications; see chapters
7 to 11 in the
BACnet
2004 specifications.
4. Furthermore, when using
BACnet
IP, everything below the IP layer is considered the physical
layer by definition so as to handle the 6 bytes composed of the IP a UDP port number
as the MAC address.
(See paragraph J.1.2 in the
BACnet
2004 specifications).
Note that the MAC address of a virtual
BACnet
device is expressed as described above.
5. In the
BACnet
specifications, the address of the data source and destination are specified using
the
BACnet
network number and this MAC address.
For details, see paragraph 6.2.2.2 in the
BACnet
2004 specifications.
2.5 MAC Address of a Virtual
BACnet
Device
1. The MAC address is a 6-byte long expression composed of the device instance number for the
indoor unit and system control device, as indicated below: The MAC address of each device is
represented by the hexadecimal conversion of the device Instance number.
(Ex. Device instance number = 531100 → 00: 08:1a:9c:00:00 = MAC Address)
