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BACnet number lookup
Updated 7 November 2026
BACnet sends almost everything as a number: the units of a reading, the property you asked for, the reason a write failed. Type the number (or part of a name) and see what it means in every table at once.
BACnet number lookup
The same number means different things in different tables (62 is degrees-celsius as a unit and Max_APDU_Length_Accepted as a property), so every match is labelled with its table.
Common ones: units 62 = degrees-celsius, 64 = degrees-fahrenheit, 98 = percent; property 85 = Present_Value, 87 = Priority_Array; error code 31 = unknown-object, 32 = unknown-property, 40 = write-access-denied; reliability 12 = communication-failure.
Full tables
- BACnet engineering units listA BACnet analog object reports its units as a number.
429 engineering units - BACnet property identifiersEvery BACnet property has a number.
485 property - BACnet object typesThe object type is the top 10 bits of every BACnet Object Identifier.
65 object type - BACnet error, reject and abort codesWhen a read or write fails, the device answers with an Error (class + code), a Reject or an Abort.
8 error class, 229 error code, 11 reject reason, 12 abort reason - BACnet reliability, event state and device statusReliability says why a value may be wrong; Event_State says whether an object is in alarm; System_Status says what the device itself is doing.
25 reliability, 6 event state, 21 event type, 6 device status - BACnet service choice numbersEvery BACnet request carries a service choice number.
35 confirmed service, 15 unconfirmed service
Values come from the open-source bacnet-stack 1.6.1 (bacenum.h), which follows ANSI/ASHRAE Standard 135, and were cross-checked one by one against two other independent BACnet stacks (bacpypes and @bacnet-js/client). Entries marked (newer) are in bacnet-stack only, because the other two stacks predate them. Numbers 0-255 (and the higher ASHRAE ranges) are standard; vendors may use proprietary numbers above them.
Other free tools: Object Identifier decoder, Vendor ID lookup, instance calculators and scan vs. points list compare.