Objects and properties

Each object type has a page: what the object models, how to serve it with the stack, and a table of its properties. The table gives each property’s conformance code, whether the stack presents it and lets a client write it, and what the stack answers when your property callback does not.

In the table below, Clause is the clause of ASHRAE 135-2024 that defines the object type. Properties is how many properties the standard defines for it, and Required is how many of those it requires on every object of the type (conformance R or W). Add with is the function that creates the object.

Object type	Clause	Properties	Required	Add with
Access Credential	12.35	32	14	BACnetStack_AddObject
Access Door	12.26	49	15	BACnetStack_AddObject
Access Point	12.31	56	18	BACnetStack_AddObject
Access Rights	12.34	18	10	BACnetStack_AddObject
Access User	12.33	21	9	BACnetStack_AddObject
Access Zone	12.32	44	12	BACnetStack_AddObject
Accumulator	12.61	45	11	BACnetStack_AddObject
Alert Enrollment	12.52	22	12	BACnetStack_AddObject
Analog Input	12.2	42	9	BACnetStack_AddObject
Analog Output	12.3	47	12	BACnetStack_AddObject
Analog Value	12.4	47	9	BACnetStack_AddObject
Audit Log	12.64	30	11	BACnetStack_AddObject
Audit Reporter	12.63	28	12	BACnetStack_AddObject
Averaging	12.5	21	12	BACnetStack_AddObject
Binary Input	12.6	39	9	BACnetStack_AddObject
Binary Lighting Output	12.55	45	13	BACnetStack_AddObject
Binary Output	12.7	49	12	BACnetStack_AddObject
Binary Value	12.8	46	8	BACnetStack_AddObject
BitString Value	12.40	39	6	BACnetStack_AddObject
Calendar	12.9	12	6	BACnetStack_AddObject, optionally BACnetStack_AddCalendarObject
Channel	12.53	33	12	BACnetStack_AddObject, then BACnetStack_AddChannelObject
CharacterString Value	12.37	38	6	BACnetStack_AddObject
Color	12.65	18	10	BACnetStack_AddObject
Color Temperature	12.66	22	12	BACnetStack_AddObject
Command	12.10	28	8	BACnetStack_AddObject
Credential Data Input	12.36	27	10	BACnetStack_AddObject
Date Pattern Value	12.48	32	6	BACnetStack_AddObject
Date Value	12.45	32	6	BACnetStack_AddObject
DateTime Pattern Value	12.46	33	6	BACnetStack_AddObject
DateTime Value	12.38	33	6	BACnetStack_AddObject
Device	12.11	80	21	BACnetStack_AddDevice
Elevator Group	12.58	16	7	BACnetStack_AddElevatorGroupObject
Escalator	12.60	37	11	BACnetStack_AddLiftOrEscalatorObject
Event Enrollment	12.12	30	16	BACnetStack_AddObject
Event Log	12.27	35	12	BACnetStack_AddEventLogObject
File	12.13	17	10	BACnetStack_AddFileObject
Global Group	12.50	37	10	BACnetStack_AddObject
Group	12.14	12	6	BACnetStack_AddObject, then BACnetStack_AddGroupObject
Integer Value	12.43	47	7	BACnetStack_AddObject
Large Analog Value	12.39	47	7	BACnetStack_AddObject
Life Safety Point	12.15	44	14	BACnetStack_AddObject
Life Safety Zone	12.16	42	15	BACnetStack_AddObject
Lift	12.59	53	14	BACnetStack_AddLiftOrEscalatorObject
Lighting Output	12.54	57	22	BACnetStack_AddObject
Load Control	12.28	39	16	BACnetStack_AddObject
Loop	12.17	51	17	BACnetStack_AddObject
Multi-state Input	12.18	34	9	BACnetStack_AddObject
Multi-state Output	12.19	41	12	BACnetStack_AddObject
Multi-state Value	12.20	40	9	BACnetStack_AddObject
Network Port	12.56	104	10	BACnetStack_AddNetworkPortObject
Notification Class	12.21	25	7	BACnetStack_AddNotificationClassObject
Notification Forwarder	12.51	19	11	BACnetStack_AddObject
OctetString Value	12.41	24	6	BACnetStack_AddObject
Positive Integer Value	12.44	47	7	BACnetStack_AddObject
Program	12.22	29	8	BACnetStack_AddObject
Pulse Converter	12.23	42	15	BACnetStack_AddObject
Schedule	12.24	31	12	BACnetStack_AddObject, then BACnetStack_AddScheduleObject
Staging	12.62	35	16	BACnetStack_AddObject
Structured View	12.29	19	6	BACnetStack_AddObject
Time Pattern Value	12.47	32	6	BACnetStack_AddObject
Time Value	12.42	32	6	BACnetStack_AddObject
Timer	12.57	42	8	BACnetStack_AddObject
Trend Log	12.25	43	13	BACnetStack_AddTrendLogObject
Trend Log Multiple	12.30	41	15	BACnetStack_AddTrendLogMultipleObject