BACnet
BACnet is a communication protocol for building automation and control networks, including BACnet/IP with Ethernet
cabling and BACnet MS/TP with EIA-485 wiring. The protocol is supported and maintained by ASHRAE Standing Standard
Project Committee 135.
BACnet IP Object Mappings
Object Description
BACnet Object
(Access Point)
Notes Available Units
Signal Strength AI1 Analog Input 1 —
Flow Rate (Flow model)
Energy Rate (BTU model)
AI2 Analog Input 2
Gallons, Liters, MGallons, Cubic Feet, Cubic Meters, Acre
Feet, Oil Barrel, Liquid Barrel, Feet, Meters, Lb, Kg, BTU,
MBTU, MMBTU, TON
Per
Second, Minute, Hour, Day
Net Totalizer AI3 Analog Input 3
Positive Totalizer AI4 Analog Input 4
Negative Totalizer AI5 Analog Input 5
Temperature 1 AI6 Analog Input 6 ºC
Temperature 2 AI7 Analog Input 7 ºC
Di Temp (1-2) AI8 Analog Input 8 ºC
Di Temp (2-1) AI9 Analog Input 9 ºC
Abs Di Temp AI10 Analog Input 10 ºC
Temperature 1 AI11 Analog Input 11 ºF
Temperature 2 AI12 Analog Input 12 ºF
Di Temp (1-2) AI13 Analog Input 13 ºF
Di Temp (2-1) AI14 Analog Input 14 ºF
Abs Di Temp AI15 Analog Input 15 ºF
Flow Rate AI16 Analog Input 16 GPM
Flow Rate AI17 Analog Input 17 LPM
Flow Rate AI18 Analog Input 18 CFH
Flow Rate AI19 Analog Input 19 CMH
Flow Rate AI20 Analog Input 20 FPS
Flow Rate AI21 Analog Input 21 MPS
Flow
Unit Code
AI22 Analog Input 22
1 = Gallons
2 = Liters
3 = MGallons
4 = Cubic Feet
5 = Cubic Meter
6 = Acre Feet
7 = Oil Barrel
8 = Liq Barrel
9 = Feet
10 = Meters
11 = LB
12 = Kg
13 = BTU
14 = MBTU
15 = MMBTU
16 = Ton
17 = KJ
18 = kWh
19 = MWh
Total
Unit Code
AI23 Analog Input 23
Total Exponent
Unit Code
AI24 Analog Input 24
1 = E-1
2 = E0
3 = E1
4 = E2
5 = E3
6 = E4
7 = E5
8 = E6
Time
Unit Code
AI25 Analog Input 25
1 = Second
2 = Minute
3 = Hour
4 = Day
5 = msec
6 = usec
7 = nsec
8 = psec
Reset Totalizers BO1
Binary Output 1
Writing a (1) active state to this
object will reset all totalizers.
The Object will then automati-
cally return to the (0) inactive
state.
—
Table 16: BACnet IP object mappings
Communications Protocols
Page 75 May 2016 TTM-UM-00136-EN-06
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