Part 2. Functional Specifications
DCM014A51 Design Guide 23
2. Settings related to the BACnet Server Gateway functions such as the device instance number
can be done from the BACnet Server Gateway configuration in the iTM Service Settings menu.
Refer to the iTM BACnet Server Gateway Commissioning manual for more details.
3. iTM and BACnet® Server Gateway Logic
3.1 BACnet Virtual Router Function
1. The iTM BACnet Server Gateway provides seamless control logic between the iTM and BMS.
2. The BACnet virtual router function allows the BMS to see each Indoor Unit Management Point
as a separate device. This allows for each Indoor Unit Management Point to have its own
independent device ID.
3.2 iTM BACnet Server Gateway Point Logic in the iTM
1. Each point exposed to the BMS from the iTM BACnet Server Gateway is linked to the logic in
the iTM. This alleviates the need for the BMS integrator to create programming to control the
VRV system. The image below identifies which BACnet points are linked to the iTM logic.
Figure 19. BACnet® Server Gateway Point and iTM Logic matchup
2. Each Indoor Unit Management Point can be assigned independent cooling and heating
occupied and unoccupied setpoints.
a. Setpoints set by the BMS are also updated in the iTM, and setpoints set at the iTM are
updated to the BMS.
b. The same logic applies to the setpoint range limitation as stated in Part 1., 3.1(2)(b) for the
minimum and maximum setpoint for cooling and heating.
c. To see how the occupancy mode is monitored and controlled, refer to 7.2.1.
To Next Page
Loading...
