Part 2. Functional Specifications
DCM014A51 Design Guide 21
Part 2. Functional Specifications
1. Introduction
The Daikin iTM BACnet® Server Gateway operates as a BACnet interpreter using the services defined by
BACnet to return the status of the indoor units connected to the DIII network. It also sends configuration
commands to the indoor units, in response to requests from the BMS (i.e., BACnet Client) which
supports the BACnet protocol (ISO16484-5, ANSI/ASHRAE135).
2. Network Topology
2.1 Visualization of Each Device on the BACnet Network
1. iTM: Operates as a BACnet router/gateway for the VRV indoor units.
2. Indoor unit device: One indoor unit management point is handled as one virtual BACnet device.
a. In the BACnet specifications, the VRV communication line (DIII network) is handled as one
virtual BACnet network.
(See Annex H.1 and H.2 in the BACnet 2004 specifications.)
3. System control device: It is handled as a virtual BACnet device to receive settings (i.e.,
enable/disable and the like) for the iTM system configuration points.
4. For a typical BACnet network configuration, see chapters 4.2 and Annex in the BACnet 2004
specifications.
Figure 18. BACnet Network
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