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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
Instance calculator. This list prints one unit; the other units follow a formula. ProtoNode boiler gateways (Laars, Peerless, Raypak, AERCO and more) instance calculator →
Reference only, provided as-is: verify against Laars’s current documentation and the live device before use. Not official Laars information. Terms of use.
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.
Object ID lookup: Laars Multiburner control point IDs by name
AI0Inlet TempAI1Outlet TempAI3DHW TempAI4System Inlet TempAI5System Outlet TempAI6Outdoor TempAI7Aux1 TempAI8Aux2 TempAI9Aux3 TempAI10Aux4 TempAI11Aux5 TempAI12Flame signal 1AI13Flame signal 2AI14Analogue input 1AI15Analogue input 2AI16Analogue input 3AI17Analogue input 4AI20Current demand sourceAI23Analogue output 1AI24Analogue output 2AI25Analogue output 3AI26Analogue output 4AI27Fan1 SpeedAI28Fan2SpeedAI29Blower 1 speedAI30Blower 2 speedAI31HSI1 currentAI32HSI2 currentAI33Burner 1 power ratingAI34Burner 2 power ratingAI35Lockout CodeAI36Blocking CodeAI38DHW Call for Heat / 10AI39CH1 Call For Heat / 10AI40CH2 Call For Heat / 10AI41CH3 Call For Heat / 10AI42CH4 Call For Heat / 10AI43Cascade Call For Heat / 10AI44Valve 1 Stage1 Cycles / 10AI45Valve 2 Stage1 Cycles / 10AI46Valve 1 Stage2 Cycles / 10AI47Valve 2 Stage2 Cycles / 10AI48Boiler pump cycles / 10AI49DHW pump Cycles / 10AI50System pump Cycles / 10AI51Average outlet tempAI52Max outlet tempAI53Min outlet tempAI54Average firing timeAI55Max firing timeAI56Min firing timeAI64Modulation probeAI65Activate serviceAI66Slave 1 stateAI67Slave 1 firing rateAI68Slave 2 stateAI69Slave 2 firing rateAI70Slave 3 stateAI71Slave 3 firing rateAI72Slave 4 stateAI73Slave 4 firing rateAI74Slave 5 stateAI75Slave 5 firing rateAI76Slave 6 stateAI77Slave 6 firing rateAI78Slave 7 stateAI79Slave 7 firing rateAI80Master stateAI81Master firing rateAI83Active CH setpointAI84Burner 1 statusAI85Burner 2 statusAI89Boiler pump statusAI90Master demandAI91Burner 1 run timeAI92Burner 2 run timeAV0CH1 enable/disableAV1CH1 setpointAV2CH1 PAV3CH1 IAV4CH1 DAV5CH2 enable/disableAV6CH2 setpointAV7CH2 PAV8CH2 IAV9CH2 DAV10CH3 enable/disableAV11CH3 setpointAV12CH3 PAV13CH3 IAV14CH3 DAV15CH4 enable/disableAV16CH4 setpointAV17CH4 PAV18CH4 IAV19CH4 DAV20DHW enable/disableAV21DHW setpointAV22DHW PAV23DHW IAV24DHW DAV25DHW recirculation enableAV26DHW recirculation Set pointAV27Cascade setpointAV28Cascade PAV29Cascade IAV30Cascade DAV35Hybrid setpointAV36Hybrid differential tempAV37VariPrime PAV38VariPrime IAV39VariPrime DAV40VariPrime delta TAV41AntiCondens EnableAV42AntiCondens TempAV43AntiCondens PAV44AntiCondens IAV45AntiCondens DBI1800Flow SwitchBI1801Low Water Cut OffBI1802Man Reset High LimitBI1803Pressure SwitchBI1804High Gas Pressure SwitchBI1805Low Gas Pressure SwitchBI1806Field Interlock SwitchBI1807Spare Safety Chain SwitchBI1900Damper Interlock SwitchBI1901Spare1 SwitchBI2100Boiler Run ContactBI2101Alarm ContactBI2102DHW PumpBI2103System PumpBI2104Louver ContactBI2105Spare1 ContactBI2106Spare2 ContactBI2107Boiler PumpBI2108Spare OutputBI2200Pilot Valve Stage 1BI2201Valve 1 Stage 1BI2202Valve 2 Stage 1BI2203Pilot valve stage 2BI2204Valve 1 Stage 2BI2205Valve 2 Stage 2BV0DHW demandBV1CH1 demandBV2CH2 demandBV3CH3 demandBV4CH4 demandBV5Parameters enable
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. 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 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.