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Boiler controller gateway · BACnet points list
Laars Multiburner control - ProtoNode BACnet points list
Updated 28 October 2026
The ProtoNode reads the Multiburner control over Modbus RTU and serves 149 objects per boiler. Analog inputs cover temperatures, flame signals, fan and blower speeds, lockout and blocking codes, history counters and lead-lag slave states; binary inputs show the safety chain switches, contacts and gas valve stages. Writable AVs and BVs hold the CH1-CH4, DHW and cascade enables, setpoints and PID terms plus the demand switches.
This page lists 149 BACnet objects for the Laars Multiburner control - ProtoNode — 48 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Laars’s own free documentation, linked below.
- Manufacturer
- Laars
- Model
- Multiburner control - ProtoNode
- Equipment
- Boiler controller gateway
- Equipment type
- Boilers & water heaters
- BACnet objects
- 149 (48 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 50000 + device Node-ID
- Also known as
- Multiburner, Laars Multiburner, Multi-burner, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode
BMS integration notes: Laars Multiburner control - ProtoNode
Enable the CH1 circuit, give it a call for heat with BV 1 and write the CH1 setpoint (or the cascade setpoint when boilers run in cascade). Read the run contact, burner 1 status and outlet temperature, and watch the alarm contact and lockout code.
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 0 | CH1 enable/disable | CH1 heating circuit enable | Write |
| BV 1 | CH1 demand | CH1 call for heat | Write |
| AV 1 | CH1 setpoint | CH1 water setpoint | Write |
| AV 27 | Cascade setpoint | Setpoint when boilers run in cascade | Write |
| BI 2100 | Boiler Run Contact | Boiler run output | Read |
| AI 84 | Burner 1 status | Burner 1 state code | Read |
| AI 1 | Outlet Temp | Outlet water temperature | Read |
| BI 2101 | Alarm Contact | Alarm output | Read |
| AI 35 | Lockout Code | Lockout reason code | Read |
Enable & remote start
AV 0 CH1 enable/disable enables the CH1 circuit and BV 1 CH1 demand is its call for heat; the mapping gives no values for either. CH2-CH4 and DHW have matching enable, setpoint and demand objects.
Network setup
- Device instance = Node_Offset + boiler Node-ID. Node_Offset defaults to 50000 and is changed in the ProtoNode web configurator; Node-IDs must be unique, 1-255.
- Boiler to ProtoNode: Modbus RTU, 38400 baud, 8 data bits, no parity, 1 stop bit.
- Default ProtoNode IP address 192.168.1.24, mask 255.255.255.0. Choose BACnet IP or BACnet MS/TP with the Protocol Selector, then add one profile per device with its Node-ID.
- With more than one device on a ProtoNode, set BACnet Virtual Server Nodes to Yes. For BACnet MS/TP also set MAC address, baud rate and Max Master.
- Two or more ProtoNodes on the same subnet need different BACnet Network Numbers (default 50).
- A ProtoNode handles 1,500 registers in total; this profile uses 149 per device.
Watch out for
- The PID terms (P, I, D) for every circuit are writable AVs; they are tuning values, not points to write from a BMS.
- No code lists are given for Lockout Code, Blocking Code or the burner and slave states.
- BV 5 Parameters enable is writable but not explained in the mapping.
Laars Multiburner control - ProtoNode 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 | 0 | Inlet Temp | Temperature | Read | ||
| AImin | 1 | Outlet Temp | Temperature | Read | ||
| AI | 3 | DHW Temp | Temperature | Read | ||
| AI | 4 | System Inlet Temp | Temperature | Read | ||
| AI | 5 | System Outlet Temp | Temperature | Read | ||
| AI | 6 | Outdoor Temp | Temperature | Read | ||
| AI | 7 | Aux1 Temp | Temperature | Read | ||
| AI | 8 | Aux2 Temp | Temperature | Read | ||
| AI | 9 | Aux3 Temp | Temperature | Read | ||
| AI | 10 | Aux4 Temp | Temperature | Read | ||
| AI | 11 | Aux5 Temp | Temperature | Read | ||
| AI | 12 | Flame signal 1 | Read | |||
| AI | 13 | Flame signal 2 | Read | |||
| AI | 14 | Analogue input 1 | Read | |||
| AI | 15 | Analogue input 2 | Read | |||
| AI | 16 | Analogue input 3 | Read | |||
| AI | 17 | Analogue input 4 | Read | |||
| AI | 20 | Current demand source | Read | |||
| AI | 23 | Analogue output 1 | Read | |||
| AI | 24 | Analogue output 2 | Read | |||
| AI | 25 | Analogue output 3 | Read | |||
| AI | 26 | Analogue output 4 | Read | |||
| AI | 27 | Fan1 Speed | Read | |||
| AI | 28 | Fan2Speed | Read | |||
| AI | 29 | Blower 1 speed | Read | |||
| AI | 30 | Blower 2 speed | Read | |||
| AI | 31 | HSI1 current | Read | |||
| AI | 32 | HSI2 current | Read | |||
| AI | 33 | Burner 1 power rating | % | Read | ||
| AI | 34 | Burner 2 power rating | % | Read | ||
| AImin | 35 | Lockout Code | Read | |||
| AI | 36 | Blocking Code | Read | |||
| AI | 38 | DHW Call for Heat / 10 | Count divided by 10 | Read | ||
| AI | 39 | CH1 Call For Heat / 10 | Count divided by 10 | Read | ||
| AI | 40 | CH2 Call For Heat / 10 | Count divided by 10 | Read | ||
| AI | 41 | CH3 Call For Heat / 10 | Count divided by 10 | Read | ||
| AI | 42 | CH4 Call For Heat / 10 | Count divided by 10 | Read | ||
| AI | 43 | Cascade Call For Heat / 10 | Count divided by 10 | Read | ||
| AI | 44 | Valve 1 Stage1 Cycles / 10 | Count divided by 10 | Read | ||
| AI | 45 | Valve 2 Stage1 Cycles / 10 | Count divided by 10 | Read | ||
| AI | 46 | Valve 1 Stage2 Cycles / 10 | Count divided by 10 | Read | ||
| AI | 47 | Valve 2 Stage2 Cycles / 10 | Count divided by 10 | Read | ||
| AI | 48 | Boiler pump cycles / 10 | Count divided by 10 | Read | ||
| AI | 49 | DHW pump Cycles / 10 | Count divided by 10 | Read | ||
| AI | 50 | System pump Cycles / 10 | Count divided by 10 | Read | ||
| AI | 51 | Average outlet temp | Temperature | Read | ||
| AI | 52 | Max outlet temp | Temperature | Read | ||
| AI | 53 | Min outlet temp | Temperature | Read | ||
| AI | 54 | Average firing time | h | Read | ||
| AI | 55 | Max firing time | h | Read | ||
| AI | 56 | Min firing time | h | Read | ||
| AI | 64 | Modulation probe | Read | |||
| AI | 65 | Activate service | Read | |||
| AI | 66 | Slave 1 state | Read | |||
| AI | 67 | Slave 1 firing rate | Read | |||
| AI | 68 | Slave 2 state | Read | |||
| AI | 69 | Slave 2 firing rate | Read | |||
| AI | 70 | Slave 3 state | Read | |||
| AI | 71 | Slave 3 firing rate | Read | |||
| AI | 72 | Slave 4 state | Read | |||
| AI | 73 | Slave 4 firing rate | Read | |||
| AI | 74 | Slave 5 state | Read | |||
| AI | 75 | Slave 5 firing rate | Read | |||
| AI | 76 | Slave 6 state | Read | |||
| AI | 77 | Slave 6 firing rate | Read | |||
| AI | 78 | Slave 7 state | Read | |||
| AI | 79 | Slave 7 firing rate | Read | |||
| AI | 80 | Master state | Read | |||
| AI | 81 | Master firing rate | Read | |||
| AI | 83 | Active CH setpoint | Read | |||
| AImin | 84 | Burner 1 status | Read | |||
| AI | 85 | Burner 2 status | Read | |||
| AI | 89 | Boiler pump status | Read | |||
| AI | 90 | Master demand | Read | |||
| AI | 91 | Burner 1 run time | h | Read | ||
| AI | 92 | Burner 2 run time | h | Read | ||
| AVmin | 0 | CH1 enable/disable | Write | |||
| AVmin | 1 | CH1 setpoint | Temperature | Write | ||
| AV | 2 | CH1 P | Write | |||
| AV | 3 | CH1 I | Write | |||
| AV | 4 | CH1 D | Write | |||
| AV | 5 | CH2 enable/disable | Write | |||
| AV | 6 | CH2 setpoint | Temperature | Write | ||
| AV | 7 | CH2 P | Write | |||
| AV | 8 | CH2 I | Write | |||
| AV | 9 | CH2 D | Write | |||
| AV | 10 | CH3 enable/disable | Write | |||
| AV | 11 | CH3 setpoint | Temperature | Write | ||
| AV | 12 | CH3 P | Write | |||
| AV | 13 | CH3 I | Write | |||
| AV | 14 | CH3 D | Write | |||
| AV | 15 | CH4 enable/disable | Write | |||
| AV | 16 | CH4 setpoint | Temperature | Write | ||
| AV | 17 | CH4 P | Write | |||
| AV | 18 | CH4 I | Write | |||
| AV | 19 | CH4 D | Write | |||
| AV | 20 | DHW enable/disable | Write | |||
| AV | 21 | DHW setpoint | Temperature | Write | ||
| AV | 22 | DHW P | Write | |||
| AV | 23 | DHW I | Write | |||
| AV | 24 | DHW D | Write | |||
| AV | 25 | DHW recirculation enable | Write | |||
| AV | 26 | DHW recirculation Set point | Temperature | Write | ||
| AVmin | 27 | Cascade setpoint | Temperature | Write | ||
| AV | 28 | Cascade P | Write | |||
| AV | 29 | Cascade I | Write | |||
| AV | 30 | Cascade D | Write | |||
| AV | 35 | Hybrid setpoint | Temperature | Write | ||
| AV | 36 | Hybrid differential temp | Temperature | Write | ||
| AV | 37 | VariPrime P | Write | |||
| AV | 38 | VariPrime I | Write | |||
| AV | 39 | VariPrime D | Write | |||
| AV | 40 | VariPrime delta T | Temperature | Write | ||
| AV | 41 | AntiCondens Enable | Write | |||
| AV | 42 | AntiCondens Temp | Temperature | Write | ||
| AV | 43 | AntiCondens P | Write | |||
| AV | 44 | AntiCondens I | Write | |||
| AV | 45 | AntiCondens D | Write | |||
| BI | 1800 | Flow Switch | Read | |||
| BI | 1801 | Low Water Cut Off | Read | |||
| BI | 1802 | Man Reset High Limit | Read | |||
| BI | 1803 | Pressure Switch | Read | |||
| BI | 1804 | High Gas Pressure Switch | Read | |||
| BI | 1805 | Low Gas Pressure Switch | Read | |||
| BI | 1806 | Field Interlock Switch | Read | |||
| BI | 1807 | Spare Safety Chain Switch | Read | |||
| BI | 1900 | Damper Interlock Switch | Read | |||
| BI | 1901 | Spare1 Switch | Read | |||
| BImin | 2100 | Boiler Run Contact | Read | |||
| BImin | 2101 | Alarm Contact | Read | |||
| BI | 2102 | DHW Pump | Read | |||
| BI | 2103 | System Pump | Read | |||
| BI | 2104 | Louver Contact | Read | |||
| BI | 2105 | Spare1 Contact | Read | |||
| BI | 2106 | Spare2 Contact | Read | |||
| BI | 2107 | Boiler Pump | Read | |||
| BI | 2108 | Spare Output | Read | |||
| BI | 2200 | Pilot Valve Stage 1 | Read | |||
| BI | 2201 | Valve 1 Stage 1 | Read | |||
| BI | 2202 | Valve 2 Stage 1 | Read | |||
| BI | 2203 | Pilot valve stage 2 | Read | |||
| BI | 2204 | Valve 1 Stage 2 | Read | |||
| BI | 2205 | Valve 2 Stage 2 | Read | |||
| BV | 0 | DHW demand | Write | |||
| BVmin | 1 | CH1 demand | Write | |||
| BV | 2 | CH2 demand | Write | |||
| BV | 3 | CH3 demand | Write | |||
| BV | 4 | CH4 demand | Write | |||
| BV | 5 | Parameters enable | Write |
No points match these filters.
Integration notes
- Each boiler on the ProtoNode's RS-485 bus shows up as its own BACnet device, and every one uses the same object IDs. The device instance is Node_Offset (default 50000) plus the boiler's Node-ID, so Node-ID 1 = device 50001.
- The mapping has no read/write column. AV, BV and MV objects are mapped to Metasys N2 outputs and LonWorks input variables, so they are listed here as writable; AI, BI and MI objects are read-only.
- No units or state texts are given; the LonWorks SNVT types show which values are temperatures, percentages and hours.
- Bit-mapped binary inputs are numbered from their Modbus register and bit: BI 1800-1807 are register 40018 bits 0-7, BI 2100-2108 are register 40021 bits 0-8, and so on.
- Points named '/ 10' (call-for-heat and cycle counts) are reported divided by 10.
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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Multiburner control - ProtoNode 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 Laars Multiburner control - ProtoNode
How many BACnet points does the Laars Multiburner control - ProtoNode have?
This list has 149 BACnet objects: 76 analog inputs, 42 analog values, 25 binary inputs, 6 binary values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Laars Multiburner control - ProtoNode BACnet points are writable?
48 of the 149 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 Laars Multiburner control - ProtoNode BACnet documentation?
The source is Vendor Protocol Mapping (LAARS Vendor Mappings for the ProtoNode FPC-N34 / FPC-N35) (4404), revision Document Revision 14.B, October 2020, published free by Laars at https://www.laars.com/uploads/products/4404.pdf.
What are the minimum BACnet points to integrate the Laars Multiburner control - ProtoNode?
Start with AV 0 CH1 enable/disable (CH1 heating circuit enable); BV 1 CH1 demand (CH1 call for heat); AV 1 CH1 setpoint (CH1 water setpoint); AV 27 Cascade setpoint (Setpoint when boilers run in cascade); BI 2100 Boiler Run Contact (Boiler run output); AI 84 Burner 1 status (Burner 1 state code); AI 1 Outlet Temp (Outlet water temperature); BI 2101 Alarm Contact (Alarm output); AI 35 Lockout Code (Lockout reason code).
How do I enable BMS control of the Laars Multiburner control - ProtoNode?
AV 0 CH1 enable/disable enables the CH1 circuit and BV 1 CH1 demand is its call for heat; the mapping gives no values for either. CH2-CH4 and DHW have matching enable, setpoint and demand objects.
How do I check these points on the real Multiburner control - ProtoNode?
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 Laars BACnet points lists
- Boiler controller gateway
Laars HTD control - ProtoNode
Laars boilers with the HTD control, read through a ProtoNode FPC-N34 gateway (the document does not name the models).
Also known as: HTD, Laars HTD, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode - Boiler controller gateway
Laars MagnaTherm - ProtoNode
Laars MagnaTherm units, read through a ProtoNode FPC-N34 gateway.
Also known as: MagnaTherm, Laars MagnaTherm, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode - Boiler controller gateway
Laars OmniTherm - ProtoNode
Laars OmniTherm units, read through a ProtoNode FPC-N34 gateway.
Also known as: OmniTherm, Laars OmniTherm, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode - Boiler controller gateway
Laars Sola control - ProtoNode
Laars boilers with the Sola control, read through a ProtoNode FPC-N34 gateway (the document does not name the models).
Also known as: Sola, Laars Sola, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode - Gas valve gateway
Laars SV2 gas valve - ProtoNode
The SV2 device on Laars equipment, read through a ProtoNode FPC-N34 gateway. The document does not describe the SV2; its point names cover a gas valve with VPS tests and pressure and fuel/air modules.
Also known as: SV2, Laars SV2, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode
Source: Vendor Protocol Mapping (LAARS Vendor Mappings for the ProtoNode FPC-N34 / FPC-N35) · 4404 · rev. Document Revision 14.B, October 2020. Object names, instances and units are reproduced as published; descriptions are our own.