BACnet_Device

This property indicates whether the BACnet Device supports segmentation of messages and, if so, whether it supports segmented transmission, reception, or both:

{SEGMENTED_BOTH, SEGMENTED_TRANSMIT, SEGMENTED_RECEIVE, NO_SEGMENTATION}.

The Device_Address_Binding property is a List of BACnetAddressBinding each of which consists of a BACnet

Object_Identifier of a BACnet Device object and a BACnet device address in the form of a BACnetAddress. Entries in the list identify the actual device addresses that will be used when the remote device must be accessed via a BACnet service request. A value of zero is used for the network-number portion of BACnetAddress entries for other devices residing on the same network as this device. The list may be empty if no device identifier-device address bindings are currently known to the device.

Is present if the device is a node on an MS/TP network. The value of Max_Info_Frames specifies the maximum number of information frames the node may send before it must pass the token.

If Max_Info_Frames is not writable or otherwise user configurable, its value is one.

The APDU_Segment_Timeout property indicates the amount of time in milliseconds between retransmission of an APDU segment. The default value for this property is 2000 milliseconds. This value is non-zero if the Device object property called Number_Of_APDU_Retries is non-zero. If segmentation of any kind is supported, then the APDU_Segment_Timeout property will be present.

In order to achieve reliable communication, it is recommended that the values of the APDU_Segment_Timeout properties of the Device objects of all intercommunicating devices contain the same value.

This property indicates the minor revision level of the BACnet standard. This value starts at 1 and is incremented for any substantive change(s) to the BACnet standard that affect device communication or behavior. This value will revert to zero upon each change to the Protocol_Version property. Changes to the values for Protocol_Version and Protocol_Revision are recorded in the History of Revisions at the end of this standard.

This property is required for all devices implementing BACnet Protocol_Version 1, Protocol_Revision 1 and above. Absence of this property will indicate a device implemented to a version of the standard prior to the definition of the Protocol_Revision property.

The Active_COV_Subscriptions property is a list of BACnetCOVSubscription, each of which consists of a Recipient, a Monitored Property Reference, an Issue Confirmed Notifications flag, a Time Remaining value and an optional COV Increment. This property provides a network-visible indication of those COV subscriptions that are active at any given time.

Whenever a COV Subscription is created with the SubscribeCOV or SubscribeCOVProperty service, a new entry is added to the Active_COV_Subscriptions list. Similarly, whenever a COV Subscription is terminated, the corresponding entry is removed from the Active_COV_Subscriptions list.

This property is required if the device supports execution of either SubscribeCOV or SubscribeCOVProperty service.

This property reflects the current physical and logical status of the BACnet Device. The values that may be taken on by this property are

{OPERATIONAL,OPERATIONAL_READ_ONLY,DOWNLOAD_REQUIRED, DOWNLOAD_IN_PROGRESS, NON_OPERATIONAL}.

The exact meaning of these states in a given device and their synchronization with other internal operations of the device or the execution of BACnet services by the device are local matters and are not defined by this standard.

The last cause for a restart. Following states are available:

• 0 - unknown

• 1 - coldstart

• 2 - warmstart

• 3 - detected-power-lost

• 4 - detected-powered-off

• 5 - hardware-watchdog

• 6 - software-watchdog

• 7 - suspended