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Thermal mass flow meter · BACnet points list
Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) BACnet points list
Updated 12 November 2026
The Sage Prime is a thermal mass flow meter for gas. The BACnet version talks BACnet MS/TP on its RS-485 terminals and exposes 13 objects: serial number, flow rate, gas temperature and RTD power as inputs, plus analog values for K factor, filtering, low-flow cutoff, full scale, the totalizer and the MS/TP MAC address and baud rate.
This page lists 13 BACnet objects for the Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) — 9 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Sage Metering’s own free documentation, linked below.
- Manufacturer
- Sage Metering
- Model
- Sage Prime thermal mass flow meter (BACnet MS/TP)
- Equipment
- Thermal mass flow meter
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 13 (9 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 1142049
- Also known as
- Sage Prime, Sage Prime BACnet, Sage Metering Prime, Sage thermal mass flow meter BACnet
- Source document
- Sage Prime BACnet Quick Start Guide · rev. 2021-07-26
Reference only, provided as-is: verify against Sage Metering’s current documentation and the live device before use. Not official Sage Metering information. Terms of use.
BMS integration notes: Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP)
Wire the RS-485 terminals (C1 ground, C2 B+, C3 A-) to the MS/TP trunk, set a unique MAC address and device instance, then read Flow Rate, Temperature and the Totalizer.
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 | Flow Rate | Measured gas flow rate | Read |
| AV 5 | Totalizer | Totalized flow | Command |
| AI 3 | Temperature | Gas temperature, °F | Read |
Network setup
- Defaults: MAC 49, 9600 baud, device instance 1142049, device name Sage Prime, max master 127, max info frames 1.
- Device name and instance are set by writing the Device object properties; changes apply at once.
- MAC address (AV 100) and baud rate (AV 101) only apply after a power cycle or writing 1 to Apply Changes (BV 100).
Watch out for
- Writing 1 to Enable SageCom (BV 101) turns the RS-485 port over to the SageCom tool after a power cycle; BACnet stops until the next power cycle.
- If the baud, parity or slave ID used by SageCom were changed from 19200 / Even / 49, the meter drops off MS/TP and falls into SageCom mode about two minutes after power-up.
Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) 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 | |||||
|---|---|---|---|---|---|---|
| AI | 1 | Serial Number | Meter serial number | no-units | Read | |
| AImin | 2 | Flow Rate | Measured mass flow rate | no-units | Read | |
| AImin | 3 | Temperature | Gas temperature | degrees-Fahrenheit | Read | |
| AI | 4 | RTD Power | Sensor RTD power | milliwatts | Read | |
| AV | 1 | K Factor | Flow calibration K factor | no-units | Command | |
| AV | 2 | Filtering | Flow reading filter setting | no-units | Command | |
| AV | 3 | Low Flow Cutoff | Flow below this reads zero | no-units | Command | |
| AV | 4 | Full Scale | Full-scale flow | no-units | Command | |
| AVmin | 5 | Totalizer | Flow totalizer | no-units | Command | |
| AV | 100 | MSTP MAC Address | MS/TP MAC address (default 49) | no-units | Command | |
| AV | 101 | MSTP Baud Rate | MS/TP baud rate (default 9600) | no-units | Command | |
| BV | 100 | Apply Changes | Write 1 to apply new MAC/baud settings | Command | Inactive / Active | |
| BV | 101 | Enable SageCom | Write 1 to switch the port to SageCom mode | Command | Inactive / Active |
No points match these filters.
Object ID lookup: Sage Metering Sage Prime point IDs by name
Integration notes
- The object list has no read/write column. Analog and binary values print a Relinquish Default, so they are shown as commandable; inputs as read-only.
- Flow Rate and the flow settings are printed with no-units; the flow unit is set in the meter.
- Source: Table 3 'BACnet Object List', page 4 (13 objects).
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 Sage Prime thermal mass flow meter (BACnet MS/TP) 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 Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP)
How many BACnet points does the Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) have?
This list has 13 BACnet objects: 4 analog inputs, 7 analog values, 2 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) BACnet points are writable?
9 of the 13 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 Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP) BACnet documentation?
The source is Sage Prime BACnet Quick Start Guide, revision 2021-07-26, published free by Sage Metering at https://sagemetering.com/downloads/bacnet/Sage-Prime-BACnet-Quick-Start-Guide.pdf.
What are the minimum BACnet points to integrate the Sage Metering Sage Prime thermal mass flow meter (BACnet MS/TP)?
Start with AI 2 Flow Rate (Measured gas flow rate); AV 5 Totalizer (Totalized flow); AI 3 Temperature (Gas temperature, °F).
How do I check these points on the real Sage Prime thermal mass flow meter (BACnet MS/TP)?
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.
Source: Sage Prime BACnet Quick Start Guide · rev. 2021-07-26. Object names, instances and units are reproduced as published; descriptions are our own.