Easy BACnet- Home
- BACnet points lists
- Cosmogas
- Argus boiler control via ProtoNode RER / LER
Boiler controller gateway (ProtoNode) · BACnet points list
Cosmogas Argus boiler control via ProtoNode RER / LER BACnet points list
Updated 6 November 2026
A ProtoNode RER (FPC-N34) reads a Cosmogas Argus managing or standalone boiler over Modbus RTU and serves it on BACnet MS/TP or BACnet IP. The 41 objects cover heating and DHW setpoints and modes, outdoor-reset parameters, supply/return/DHW/flue temperatures, firing rate, flame current, water pressure, error codes and per-burner state, status, error and firing rate for four dependent burners, plus a control register that must be set before writes.
This page lists 41 BACnet objects for the Cosmogas Argus boiler control via ProtoNode RER / LER — 11 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Cosmogas’s own free documentation, linked below.
- Manufacturer
- Cosmogas
- Model
- Argus boiler control via ProtoNode RER / LER
- Equipment
- Boiler controller gateway (ProtoNode)
- Equipment type
- Boilers & water heaters
- BACnet objects
- 41 (11 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- Cosmogas Argus BACnet, Argus managing boiler, Argus dependent boiler, RBI Infinite Energy 2 BACnet, ProtoNode RER FPC-N34-1626, ProtoNode LER FPC-N35-1625
Reference only, provided as-is: verify against Cosmogas’s current documentation and the live device before use. Not official Cosmogas information. Terms of use.
BMS integration notes: Cosmogas Argus boiler control via ProtoNode RER / LER
Set the boilers to Modbus RTU 9600 8-N-1 with unique Node-IDs, wire them to the ProtoNode, select BACnet MS/TP or BACnet IP on the S DIP switches and run auto-discovery. Before any write, set MV 95 to 1, then write setpoints and modes.
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 |
|---|---|---|---|
| AV 7 | CH Mode | Heating mode (RT, outdoor reset, 0-10 V...) | Write |
| AV 5 | Boiler CH SP | Heating setpoint, 68-179 °F | Write |
| AV 6 | Boiler DHW SP | Indirect DHW setpoint, 104-140 °F | Write |
| MV 95 | Control Register | Set to 1 before any write | Write |
| AI 2 | State | Burner state | Read |
| AI 9 | Supply Temp | Supply water temperature | Read |
| AI 10 | Return Temp | Return water temperature | Read |
| AI 14 | Firing Rate | Firing rate, % | Read |
| AI 4 | Error Code | Fault code (255 = no error) | Read |
Enable & remote start
MV 95 Control Register must be written to 1 before any value change is accepted.
Network setup
- Boiler serial settings: Modbus RTU, 9600 baud, no parity, 8 data bits, 1 stop bit; unique Node-ID per boiler.
- BACnet MS/TP MAC address on DIP bank A, baud rate on bank B (B0-B3); profile and auto-discovery on bank S.
- Device instance = Node_Offset (default 50,000) + Modbus Node-ID; BACnet IP network number default 50.
Watch out for
- Single-burner values (State, Status, Error Code, Firing Rate) apply to one-burner appliances; multi-burner units report per burner in the Dependent_n objects.
Cosmogas Argus boiler control via ProtoNode RER / LER 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 | |||||
|---|---|---|---|---|---|---|
| AV | 1 | Modbus Units | Unit flags: bit 0 °C/°F, bit 1 bar/psi | Write | ||
| AImin | 2 | State | Burner state (single-burner units) | Read | ||
| AI | 3 | Status | Burner status (single-burner units) | Read | ||
| AImin | 4 | Error Code | Error code, 255 = no error (single-burner units) | Read | ||
| AVmin | 5 | Boiler CH SP | Heating setpoint, 68-179 °F | °F | Write | |
| AVmin | 6 | Boiler DHW SP | Indirect water heater setpoint, 104-140 °F | °F | Write | |
| AVmin | 7 | CH Mode | Central heating mode | Write | 0=CH with RT, 1=CH with RT and outdoor reset, 2=CH with full outdoor reset, 3=CH with permanent heat demand, 4=CH with 0-10 Vcc input | |
| AV | 8 | DHW Mode | Domestic hot water mode | Write | 0=no DHW, 1=DHW store with sensor, 2=DHW store with thermostat, 3=N/A, 4=N/A, 5=N/A | |
| AImin | 9 | Supply Temp | Supply temperature, burner 1 (master) | Read | ||
| AImin | 10 | Return Temp | Return temperature, burner 1 (master) | Read | ||
| AI | 11 | DHW Temp | DHW tank temperature | Read | ||
| AI | 12 | Flue Gas Temp | Flue gas temperature, burner 1 (master) | Read | ||
| AI | 13 | Heat Exchanger Temp | Header temperature at the back of the heater | Read | ||
| AImin | 14 | Firing Rate | Firing rate (single-burner units) | % | Read | |
| AI | 15 | Flame Current | Flame current, burner 1 (master) | Read | ||
| AI | 16 | Water Pressure | Water pressure | Read | ||
| AI | 17 | Analog in | Analog input (doc: firing rate, single-burner units) | Read | ||
| AI | 18 | CH pump | Burner 1 (master) motorized valve state | Read | ||
| AI | 19 | Dependent_1 State | State, burner 1 (master) | Read | ||
| AI | 20 | Dependent_1 Status | Status, burner 1 (master) | Read | ||
| AI | 21 | Dependent_1 Error Code | Error code, burner 1 (master) | Read | ||
| AI | 22 | Dependent_1 Firing Rate | Firing rate, burner 1 (master) | % | Read | |
| AI | 23 | Dependent_2 State | State, burner 2 | Read | ||
| AI | 24 | Dependent_2 Status | Status, burner 2 | Read | ||
| AI | 25 | Dependent_2 Error Code | Error code, burner 2 | Read | ||
| AI | 26 | Dependent_2 Firing Rate | Firing rate, burner 2 | % | Read | |
| AI | 27 | Dependent_3 State | State, burner 3 | Read | ||
| AI | 28 | Dependent_3 Satus | Status, burner 3 | Read | ||
| AI | 29 | Dependent_3 Error Code | Error code, burner 3 | Read | ||
| AI | 30 | Dependent_3 Firing Rate | Firing rate, burner 3 | % | Read | |
| AI | 31 | Dependent_4 State | State, burner 4 | Read | ||
| AI | 32 | Dependent_4 Status | Status, burner 4 | Read | ||
| AI | 33 | Dependent_4 Error Code | Error code, burner 4 | Read | ||
| AI | 34 | Dependent_4 Firing Rate | Firing rate, burner 4 | % | Read | |
| AV | 35 | Spring Outdoor Air Temp | Outdoor reset: spring outdoor temperature (par. 2023) | Write | ||
| AV | 36 | Spring Supply Temp | Outdoor reset: spring supply temperature (par. 2024) | Write | ||
| AV | 37 | Winter Supply Temp | Outdoor reset: winter supply temperature (par. 2022) | Write | ||
| AV | 38 | Warm Weather Shutdown Temp | Warm weather shutdown temperature (par. 2020) | Write | ||
| AV | 39 | Night Setback Temp | Night setback temperature (par. 2027) | Write | ||
| AI | 40 | Outdoor Temp | Outdoor temperature | Read | ||
| MVmin | 95 | Control Register | Set to 1 before changing any value | Write |
No points match these filters.
Object ID lookup: Cosmogas Argus boiler control via ProtoNode RER / LER point IDs by name
AV1Modbus UnitsAI2StateAI3StatusAI4Error CodeAV5Boiler CH SPAV6Boiler DHW SPAV7CH ModeAV8DHW ModeAI9Supply TempAI10Return TempAI11DHW TempAI12Flue Gas TempAI13Heat Exchanger TempAI14Firing RateAI15Flame CurrentAI16Water PressureAI17Analog inAI18CH pumpAI19Dependent_1 StateAI20Dependent_1 StatusAI21Dependent_1 Error CodeAI22Dependent_1 Firing RateAI23Dependent_2 StateAI24Dependent_2 StatusAI25Dependent_2 Error CodeAI26Dependent_2 Firing RateAI27Dependent_3 StateAI28Dependent_3 SatusAI29Dependent_3 Error CodeAI30Dependent_3 Firing RateAI31Dependent_4 StateAI32Dependent_4 StatusAI33Dependent_4 Error CodeAI34Dependent_4 Firing RateAV35Spring Outdoor Air TempAV36Spring Supply TempAV37Winter Supply TempAV38Warm Weather Shutdown TempAV39Night Setback TempAI40Outdoor TempMV95Control Register
Integration notes
- The table gives no read/write column; access is inferred from object type (AV/MV writable, AI read-only).
- Write MV 95 Control Register = 1 before changing any value.
- Temperatures and pressure follow the unit flags in AV 1 (°C/°F, bar/psi); only the two setpoint ranges are stated in °F.
- Device instance = Node_Offset (default 50,000) + the boiler's Modbus Node-ID.
- Mestek hosts this guide under RBI Infinite Energy 2 water heaters; the guide itself names only Cosmogas Argus.
- Dependent_3 Satus is spelled as printed.
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 Argus boiler control via ProtoNode RER / LER 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 Cosmogas Argus boiler control via ProtoNode RER / LER
How many BACnet points does the Cosmogas Argus boiler control via ProtoNode RER / LER have?
This list has 41 BACnet objects: 30 analog inputs, 10 analog values, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Cosmogas Argus boiler control via ProtoNode RER / LER BACnet points are writable?
11 of the 41 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 Cosmogas Argus boiler control via ProtoNode RER / LER BACnet documentation?
The source is ProtoNode RER and ProtoNode LER Startup Guide - For Interfacing Cosmogas Products: Argus Managing/Standalone Boiler and Dependent Boiler (Instruction 62403594 R08), revision Jun. 06, 2017, published free by Cosmogas at https://www.literature.mestek.com/dms/RBI%20Water%20Heaters/Infinite%20Energy%202/ProtoCessor-FieldServer%20IOM%20(R08).pdf.
What are the minimum BACnet points to integrate the Cosmogas Argus boiler control via ProtoNode RER / LER?
Start with AV 7 CH Mode (Heating mode (RT, outdoor reset, 0-10 V...)); AV 5 Boiler CH SP (Heating setpoint, 68-179 °F); AV 6 Boiler DHW SP (Indirect DHW setpoint, 104-140 °F); MV 95 Control Register (Set to 1 before any write); AI 2 State (Burner state); AI 9 Supply Temp (Supply water temperature); AI 10 Return Temp (Return water temperature); AI 14 Firing Rate (Firing rate, %); AI 4 Error Code (Fault code (255 = no error)).
How do I enable BMS control of the Cosmogas Argus boiler control via ProtoNode RER / LER?
MV 95 Control Register must be written to 1 before any value change is accepted.
How do I check these points on the real Argus boiler control via ProtoNode RER / LER?
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: ProtoNode RER and ProtoNode LER Startup Guide - For Interfacing Cosmogas Products: Argus Managing/Standalone Boiler and Dependent Boiler · Instruction 62403594 R08 · rev. Jun. 06, 2017. Object names, instances and units are reproduced as published; descriptions are our own.