BACnet Overview

About BACnet

BACnet stands as a data communications protocol designed for Building Automation and Control Networks. It holds the status of an approved and standardized protocol by esteemed organizations such as the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE), the American National Standards Institute (ANSI), and the International Organization for Standardization (ISO). This protocol facilitates communication and control across various applications, including heating, ventilation, air-conditioning, lighting, access, and fire detection systems, along with their associated equipment.

BACnet Object IDs

Object	Number
Analog Input	0
Analog Output	1
Analog Value	2
Binary Input	3
Binary Output	4
Binary Value	5
Calendar	6
Command	7
Device	8
Event Enrollment	9
File	10
Group	11
Loop	12
Multi-state Input	13
Multi-state Output	14
Notification Class	15
Program	16
Schedule	17
Multi-state Value	19

BACnet Common Property's

PropertyName	Number
objectName	77
presentValue	85
priorityArray	87
device	8

BACnet Common Property's for a Device

Property Name	Device	Number
objectList	8	76
deviceName	8	77
manufacture	8	121
manufacture-id	8	120
segmentationSupported	8	107
maxApduLength	8	62

BACnet Property's

Property Name	Number
ackedTransitions	0
ackRequired	1
action	2
actionText	3
activeText	4
activeVtSessions	5
alarmValue	6
alarmValues	7
all	8
allWritesSuccessful	9
apduSegmentTimeout	10
apduTimeout	11
applicationSoftwareVersion	12
archive	13
bias	14
changeOfStateCount	15
changeOfStateTime	16
notificationClass	17
none	18
controlledVariableReference	19
controlledVariableUnits	20
controlledVariableValue	21
covIncrement	22
datelist	23
daylightSavingsStatus	24
deadband	25
derivativeConstant	26
derivativeConstantUnits	27
description	28
descriptionOfHalt	29
deviceAddressBinding	30
deviceType	31
effectivePeriod	32
elapsedActiveTime	33
errorLimit	34
eventEnable	35
eventState	36
eventType	37
exceptionSchedule	38
faultValues	39
feedbackValue	40
fileAccessMethod	41
fileSize	42
fileType	43
firmwareRevision	44
highLimit	45
inactiveText	46
inProcess	47
instanceOf	48
integralConstant	49
integralConstantUnits	50
issueConfirmedNotifications	51
limitEnable	52
listOfGroupMembers	53
listOfObjectPropertyReferences	54
listOfSessionKeys	55
localDate	56
localTime	57
location	58
lowLimit	59
manipulatedVariableReference	60
maximumOutput	61
maxApduLengthAccepted	62
maxInfoFrames	63
maxMaster	64
maxPresValue	65
minimumOffTime	66
minimumOnTime	67
minimumOutput	68
minPresValue	69
modelName	70
modificationDate	71
notifyType	72
numberOfAPDURetries	73
numberOfStates	74
objectIdentifier	75
objectList	76
objectName	77
objectPropertyReference	78
objectType	79
optional	80
outOfService	81
outputUnits	82
eventParameters	83
polarity	84
presentValue	85
priority	86
priorityArray	87
priorityForWriting	88
processIdentifier	89
programChange	90
programLocation	91
programState	92
proportionalConstant	93
proportionalConstantUnits	94
protocolConformanceClass	95
protocolObjectTypesSupported	96
protocolServicesSupported	97
protocolVersion	98
readOnly	99
reasonForHalt	100
recipient	101
recipientList	102
reliability	103
relinquishDefault	104
required	105
resolution	106
segmentationSupported	107
setpoint	108
setpointReference	109
stateText	110
statusFlags	111
systemStatus	112
timeDelay	113
timeOfActiveTimeReset	114
timeOfStateCountReset	115
timeSynchronizationRecipients	116
units	117
updateInterval	118
utcOffset	119
vendorIdentifier	120
vendorName	121
vtClassesSupported	122
weeklySchedule	123

Debugging

Wireshark/Tshark

Tshark

Install

sudo apt-get install tshark

Usage

sudo tshark -i eth0 -f "udp" | grep "BACnet-APDU"

Ping Port 47808

Check and see if port 47808 is open on your target device.

Netcat -v -u -z 192.168.15.155 47808