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Electromagnetic flow / BTU meter · BACnet points list
ONICON FT-3500 insertion electromagnetic flow / BTU meter BACnet points list
Updated 12 November 2026
The FT-3500 is an insertion electromagnetic flow meter that can also calculate thermal energy from supply and return temperatures. Over BACnet MS/TP or BACnet IP it reports energy and flow rates, temperatures, forward and reverse totals with year-to-date, previous-year, daily and 30-day totals, run hours, aux pulse totals, a mode flag and an 18-state error code.
This page lists 37 BACnet objects for the ONICON FT-3500 insertion electromagnetic flow / BTU meter — 7 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from ONICON’s own free documentation, linked below.
- Manufacturer
- ONICON
- Model
- FT-3500 insertion electromagnetic flow / BTU meter
- Equipment
- Electromagnetic flow / BTU meter
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 37 (7 writable)
- Transport
- BACnet MS/TP, BACnet IP
- Firmware
- 1.8.0 (application 2.6.0)
- Default device instance
- 57017
- Also known as
- FT-3500, FT-3500-1, FT-3500-2, FT3500, ONICON FT-3500
Reference only, provided as-is: verify against ONICON’s current documentation and the live device before use. Not official ONICON information. Terms of use.
BMS integration notes: ONICON FT-3500 insertion electromagnetic flow / BTU meter
Read AI 2 for flow and, on energy meters, AI 1 plus the supply and return temperatures. Trend AV 1 or AV 2 for totals; use the YTD and previous-year AVs for billing reports. Map MSV 0 for meter faults.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AI 2 | Volume Rate | Flow rate | Read |
| AI 1 | Energy Rate | Energy rate (BTU configuration) | Read |
| AV 1 | Mode 1 Energy Total | Mode 1 (forward) energy total | Read |
| AV 2 | Mode 1 Volume Total | Mode 1 (forward) volume total | Read |
| AI 3 | Supply Temperature | Supply temperature | Read |
| AI 4 | Return Temperature | Return temperature | Read |
| BI 0 | Mode Indication | Mode 1 = forward cooling, mode 2 = reverse heating | Read |
| MV 0 | Errors | Meter error state, 1 = Normal | Read |
Network setup
- MS/TP: device address 1-127 (default 17), baud 9600-76800 (default 38400), device instance default 57017.
- BACnet IP: default 192.168.1.24/24, UDP port 47808; DHCP or static.
- Network type, addresses and the 64/32-bit total format are set in the meter's menu or the USB utility.
Watch out for
- Check the 64-bit / 32-bit total setting if the BMS reads totals as garbage.
- Writing 0 to a user-defined or aux total resets it.
ONICON FT-3500 insertion electromagnetic flow / BTU meter BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AImin | 1 | Energy Rate | Thermal energy rate | BTU/h, kW or tons | Read | |
| AImin | 2 | Volume Rate | Flow rate | L/s, L/min, L/h, m³/h, GPM, CFS or CFM | Read | |
| AImin | 3 | Supply Temperature | Supply water temperature | °C or °F | Read | |
| AImin | 4 | Return Temperature | Return water temperature | °C or °F | Read | |
| AI | 5 | Delta Temperature | Supply-return temperature difference | °C or °F | Read | |
| AVmin | 1 | Mode 1 Energy Total | Forward / cooling energy total | BTU, ton-h or kWh | Read | |
| AVmin | 2 | Mode 1 Volume Total | Forward volume total | liters, m³, gallons or ft³ | Read | |
| AV | 3 | Mode 2 Energy Total | Reverse / heating energy total | BTU, ton-h or kWh | Read | |
| AV | 4 | Mode 2 Volume Total | Reverse volume total | liters, m³, gallons or ft³ | Read | |
| AV | 5 | Aux Input 1 Total | Auxiliary pulse input 1 total; write 0 to reset | counts | Command | |
| AV | 6 | Aux Input 2 Total | Auxiliary pulse input 2 total; write 0 to reset | counts | Command | |
| AV | 7 | Aux Input 3 Total | Auxiliary pulse input 3 total; write 0 to reset | counts | Command | |
| AV | 8 | Total Run Hr | Total run hours | h | Read | |
| AV | 9 | Run Hr Mode 1 | Run hours in mode 1 | h | Read | |
| AV | 10 | Run Hr Mode 2 | Run hours in mode 2 | h | Read | |
| AV | 11 | Mode 1 YTD Energy Total | Mode 1 energy total, year-to-date | BTU, ton-h or kWh | Read | |
| AV | 12 | Mode 1 PrevYr Energy Total | Mode 1 energy total, previous year | BTU, ton-h or kWh | Read | |
| AV | 13 | Mode 1 User Energy Total | Mode 1 energy total, user-defined; write 0 to reset | BTU, ton-h or kWh | Command | |
| AV | 14 | Mode 1 Yesterday Energy Total | Mode 1 energy total, yesterday | BTU, ton-h or kWh | Read | |
| AV | 15 | Mode 1 Last 30 Days Energy Total | Mode 1 energy total, last 30 days | BTU, ton-h or kWh | Read | |
| AV | 16 | Mode 1 YTD Volume Total | Mode 1 volume total, year-to-date | liters, m³, gallons or ft³ | Read | |
| AV | 17 | Mode 1 PrevYr Volume Total | Mode 1 volume total, previous year | liters, m³, gallons or ft³ | Read | |
| AV | 18 | Mode 1 User Volume Total | Mode 1 volume total, user-defined; write 0 to reset | liters, m³, gallons or ft³ | Command | |
| AV | 19 | Mode 1 Yesterday Volume Total | Mode 1 volume total, yesterday | liters, m³, gallons or ft³ | Read | |
| AV | 20 | Mode 1 Last 30 Days Volume Total | Mode 1 volume total, last 30 days | liters, m³, gallons or ft³ | Read | |
| AV | 21 | Mode 2 YTD Energy Total | Mode 2 energy total, year-to-date | BTU, ton-h or kWh | Read | |
| AV | 22 | Mode 2 PrevYr Energy Total | Mode 2 energy total, previous year | BTU, ton-h or kWh | Read | |
| AV | 23 | Mode 2 User Energy Total | Mode 2 energy total, user-defined; write 0 to reset | BTU, ton-h or kWh | Command | |
| AV | 24 | Mode 2 Yesterday Energy Total | Mode 2 energy total, yesterday | BTU, ton-h or kWh | Read | |
| AV | 25 | Mode 2 Last 30 Days Energy Total | Mode 2 energy total, last 30 days | BTU, ton-h or kWh | Read | |
| AV | 26 | Mode 2 YTD Volume Total | Mode 2 volume total, year-to-date | liters, m³, gallons or ft³ | Read | |
| AV | 27 | Mode 2 PrevYr Volume Total | Mode 2 volume total, previous year | liters, m³, gallons or ft³ | Read | |
| AV | 28 | Mode 2 User Volume Total | Mode 2 volume total, user-defined; write 0 to reset | liters, m³, gallons or ft³ | Command | |
| AV | 29 | Mode 2 Yesterday Volume Total | Mode 2 volume total, yesterday | liters, m³, gallons or ft³ | Read | |
| AV | 30 | Mode 2 Last 30 Days Volume Total | Mode 2 volume total, last 30 days | liters, m³, gallons or ft³ | Read | |
| BImin | 0 | Mode Indication | Current operating mode, channel 1 | Read | Mode 1 = Forward Cooling, Mode 2 = Reverse Heating | |
| MVmin | 0 | Errors | Hardware or functional fault state | Read | 1=Normal, 2=EEPROMFail, 3=I2CFail, 4=VelTblCrrpt, 5=PipCfgMssng, 6=GrnTtlCrrpt, 7=YrTtlCrrpt, 8=ElecDiffOOR, 9=Elec0 D/C, 10=Elec1 D/C, 11=ElecBckwrds, 12=CoilOpen, 13=CoilShort, 14=CoilOOR, 15=EmptyPipe, 16=BrdTempFail, 17=3.3VRailLow, 18=RtcFail |
No points match these filters.
Object ID lookup: ONICON FT-3500 point IDs by name
AI1Energy RateAI2Volume RateAI3Supply TemperatureAI4Return TemperatureAI5Delta TemperatureAV1Mode 1 Energy TotalAV2Mode 1 Volume TotalAV3Mode 2 Energy TotalAV4Mode 2 Volume TotalAV5Aux Input 1 TotalAV6Aux Input 2 TotalAV7Aux Input 3 TotalAV8Total Run HrAV9Run Hr Mode 1AV10Run Hr Mode 2AV11Mode 1 YTD Energy TotalAV12Mode 1 PrevYr Energy TotalAV13Mode 1 User Energy TotalAV14Mode 1 Yesterday Energy TotalAV15Mode 1 Last 30 Days Energy TotalAV16Mode 1 YTD Volume TotalAV17Mode 1 PrevYr Volume TotalAV18Mode 1 User Volume TotalAV19Mode 1 Yesterday Volume TotalAV20Mode 1 Last 30 Days Volume TotalAV21Mode 2 YTD Energy TotalAV22Mode 2 PrevYr Energy TotalAV23Mode 2 User Energy TotalAV24Mode 2 Yesterday Energy TotalAV25Mode 2 Last 30 Days Energy TotalAV26Mode 2 YTD Volume TotalAV27Mode 2 PrevYr Volume TotalAV28Mode 2 User Volume TotalAV29Mode 2 Yesterday Volume TotalAV30Mode 2 Last 30 Days Volume TotalBI0Mode IndicationMV0Errors
Integration notes
- The manual gives the function text, not printed object names, for AI 1-5 and AV 1-30; the function text is used as the name. BI 0 and MSV 0 have printed names.
- Energy objects only carry data when the meter is set up for energy (supply and return temperature) measurement.
- The "user defined" and aux pulse totals reset when 0 is written; they are marked C (the AVs have a priority array).
- Totals can be sent as 64-bit or 32-bit values (meter setting, default 64-bit); the PICS also lists a Large Analog Value type.
- AI objects support intrinsic alarming (high/low limits, notification class).
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the FT-3500 insertion electromagnetic flow / BTU meter and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the ONICON FT-3500 insertion electromagnetic flow / BTU meter
How many BACnet points does the ONICON FT-3500 insertion electromagnetic flow / BTU meter have?
This list has 37 BACnet objects: 5 analog inputs, 30 analog values, 1 binary input, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which ONICON FT-3500 insertion electromagnetic flow / BTU meter BACnet points are writable?
7 of the 37 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done. The source has no read/write column, so this is inferred from object type.
Where is the official ONICON FT-3500 insertion electromagnetic flow / BTU meter BACnet documentation?
The source is FT-3500 Insertion Electromagnetic Flow Meter Manual (DOC-0006324), revision Rev. H (PICS dated 01/03/2023), published free by ONICON at https://www.onicon.com/download/ft-3500-insertion-electromagnetic-flow-meter-manual/?v=6064.
What are the minimum BACnet points to integrate the ONICON FT-3500 insertion electromagnetic flow / BTU meter?
Start with AI 2 Volume Rate (Flow rate); AI 1 Energy Rate (Energy rate (BTU configuration)); AV 1 Mode 1 Energy Total (Mode 1 (forward) energy total); AV 2 Mode 1 Volume Total (Mode 1 (forward) volume total); AI 3 Supply Temperature (Supply temperature); AI 4 Return Temperature (Return temperature); BI 0 Mode Indication (Mode 1 = forward cooling, mode 2 = reverse heating); MV 0 Errors (Meter error state, 1 = Normal).
How do I check these points on the real FT-3500 insertion electromagnetic flow / BTU meter?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
More ONICON BACnet points lists
- Turbine flow meter (insertion)
ONICON F-1500 insertion turbine flow meter (BACnet MS/TP)
ONICON F-1500 series insertion turbine flow meters with the communication type set to BACnet MS/TP.
Also known as: F-1500, F-1500 Series Turbine Meter, ONICON F-1500 BACnet - Ultrasonic flow meter (clamp-on)
ONICON F-4300 clamp-on ultrasonic flow meter (BACnet MS/TP)
ONICON F-4300 clamp-on transit-time ultrasonic flow meters with the RS485 BACnet MS/TP interface.
Also known as: F-4300, F4300, ONICON F-4300, F-4300 clamp-on - Ultrasonic flow meter
ONICON F-4600 Inline Ultrasonic Flow Meter (LCD)
ONICON F-4600 inline ultrasonic flow meters with LCD and the BACnet MS/TP output.
Also known as: F-4600, F-4600-BAC, F4600, ONICON F-4600 - Electromagnetic flow meter
ONICON FT-3000 series (FT-3200) inline electromagnetic flow meter, BACnet MS/TP
ONICON FT-3000 series inline electromagnetic flow meters with the BACnet MS/TP output (PICS model FT-32**-*****-21**).
Also known as: FT-3200, FT-3000, FT-32**-*****-21**, ONICON FT-3000 BACnet - BTU (energy) meter
ONICON System-10-BAC BTU Meter Network Interface
ONICON System-10 BTU meters fitted with the BACnet network interface (BACnet MS/TP or BACnet IP).
Also known as: System-10-BAC, System-10, System 10 BTU meter, ONICON System-10 - BTU (energy) meter, two-channel
ONICON System-1000 Flow and Energy Measurement System
ONICON System-1000 flow and energy (BTU) meters, single or two-channel, with the BACnet MS/TP or BACnet IP network option.
Also known as: System-1000, SYS-1000, SYS-1100-111, SYS-1100-121, SYS-1200-111, SYS-1200-121, ONICON System 1000 BTU meter - BTU (energy) meter
ONICON System-20 BTU Meter
ONICON System-20 BTU meters with the RS485 BACnet MS/TP interface, used on chilled and hot water loops.
Also known as: System-20, System 20, ONICON System-20, S-20 BTU meter - BTU (energy) meter, clamp-on ultrasonic
ONICON System-40 BTU Measurement System
ONICON System-40 BTU measurement systems (clamp-on ultrasonic flow plus supply/return temperature) with the BACnet MS/TP interface.
Also known as: System-40, System 40, System-40-BAC, ONICON System-40
Source: FT-3500 Insertion Electromagnetic Flow Meter Manual · DOC-0006324 · rev. Rev. H (PICS dated 01/03/2023). Object names, instances and units are reproduced as published; descriptions are our own.