Various properties of the BacnetNetwork’s Local Device affect server-side visibility or operation, in addition to the critical Object Id property (see Figure 9). Figure 92 shows a portion of the property sheet of a Local Device, with some of these properties.
The following descriptions apply to some of these writable properties:
The three APDU settings below are used in both client and server operation. Many sites will require different settings of
these parameters.For instance, for a small IP-based network, optimal settings may be more like:
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Apdu Timeout = 5000 ms
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Number of Apdu retries =1
Large, routed networks may require higher Apdu Timeouts.
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Location — Optional text string to describe location of the Niagara host (default is “unknown.”)
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Description — Optional text string to describe the BACnet Device object.
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Apdu Segment Timeout — (default is 2000 ms) Defines the time waited before retransmission of an APDU segment (only relevant if devices are doing segmentation).
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Apdu Timeout — (default is 3000 ms) Defines the time waited before retransmission of an APDU requiring acknowledgment, for which no acknowledgement has been received.
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Number of Apdu retries — (default is 3) Defines the maximum number of an APDU will be retransmitted.
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Backup Failure Timeout — (default is 3 minutes) See Local Device backup and restore properties for details on this property and other read-only backup related properties.
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Character Set — (default ANSI X3.4) Defines the character set supported, with other selections being IBM/Microsoft DBCS, JIS C 6226, ISO 10646 (UCS-4), ISO 10646 (UCS-2), ISO 8859-1, and “Unknown.”