GSA Guide to Specifying Interoperable Building Automation

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Extra info for GSA Guide to Specifying Interoperable Building Automation and Control Systems Using ANSI-ASHRAE Standard 135-1995, BACne NISTIR 6392

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30 This would work fine for many buildings but may be too restrictive for very large buildings. If the XX and FF fields were combined into one range that was assigned serially as devices were installed, the total number of possible BACnet devices increases to 4,195 and they could be arbitrarily assigned to different networks. These kinds of decisions can be made on a buildingby-building basis. The critical factor is that the range of possible values be restricted to a set that will never conflict with assignments made in other buildings in the same network domain.

BACnet requires that each network in a system be assigned a unique network number. This means that if separate buildings are to be connected the assignment of network numbers must be managed so that no duplicate numbers occur. A GSA-wide plan for assigning network numbers should be developed and vendors should be required to follow it. • Specify that network numbers shall be assigned as designated by the owner. The recommended approach for assigning network numbers is to allow each region to use the entire network number domain within that region.

5 for the BACnet devices defined therein. 1 BIBB - Network Management - Connection Establishment - A (NM-CE-A) The A device commands a half-router to establish and terminate connections as needed for communication with other devices. 2 BIBB - Network Management - Connection Establishment - B (NM-CE-B) The B device executes commands to establish and terminate connections as needed. 3 BIBB - Network Management - Router Configuration - A (NM-RC-A) The A device may query and change the configuration of routers and half-routers.

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