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Gas valve gateway · BACnet points list
Laars SV2 gas valve - ProtoNode BACnet points list
Updated 28 October 2026
The ProtoNode reads the SV2 over Modbus RTU and serves 82 objects per device. Most are read-only: valve open states, VPS test results, pressure module readings and status, gas pressure limit setup, active alarm count, the last two fault codes and accumulated hours and cycles. Only the four unit-selection objects are writable.
This page lists 82 BACnet objects for the Laars SV2 gas valve - ProtoNode — 4 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
- SV2 gas valve - ProtoNode
- Equipment
- Gas valve gateway
- Equipment type
- Valves & actuators
- BACnet objects
- 82 (4 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 50000 + device Node-ID
- Also known as
- SV2, Laars SV2, ProtoNode FPC-N34, ProtoNode FPC-N35, FPC-N34-0701, Laars ProtoNode
BMS integration notes: Laars SV2 gas valve - ProtoNode
Monitoring only: read the valve system state, MV1/MV2 open status and the pressure module reading, then watch the lockout flag, the active alarm count and the most recent fault code. The only writable objects are the unit selections.
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 |
|---|---|---|---|
| MI 54 | Valve System States | Valve system state code | Read |
| BI 26 | MV1 Open | Main valve 1 open | Read |
| BI 27 | MV2 Open | Main valve 2 open | Read |
| AI 36 | Current Pressure Mod Press Reading | Current pressure module reading | Read |
| MI 37 | Pressure Module Status | Pressure module status code | Read |
| BI 32 | Lockout | Valve in lockout | Read |
| AI 24 | Num of Currently Active Alarms | Number of active alarms | Read |
| AI 64 | Fault Code Of Most Recent Fault | Fault code of the latest fault | Read |
Network setup
- Device instance = Node_Offset + device Node-ID. Node_Offset defaults to 50000 and is changed in the ProtoNode web configurator; Node-IDs must be unique, 1-255.
- Device 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 75 per device.
Watch out for
- BV 1, MV 2, MV 3 and BV 4 set the units the valve reports in; set them once, not from a schedule.
- Remote Reset Command (AI 5) is read-only in this mapping, so a remote reset can't be written through it.
Laars SV2 gas valve - 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 | 5 | Remote Reset Command | Read | |||
| AI | 6 | Pressure Module Factory Data | Read | |||
| AI | 10 | Max Allowed Leakage in User Units | Read | |||
| AI | 11 | Space Between Valves Volume | Read | |||
| AI | 12 | Ext Chmbr Space for Ext Pip btwn V1/V | Read | |||
| AI | 16 | Max HGP Lim Per Deviation | % | Read | ||
| AI | 17 | Max LGP Lim Per Deviation | % | Read | ||
| AI | 19 | Calc LGP Lim SP | Read | |||
| AI | 20 | Calc HGP Lim SP | Read | |||
| AI | 21 | User Entered Valve Name | Read | |||
| AI | 22 | Date Stamp | Read | |||
| AI | 23 | Valve Electronic SW Rev | Read | |||
| AImin | 24 | Num of Currently Active Alarms | Read | |||
| AI | 34 | Min Applicable Pressure | Read | |||
| AI | 35 | Max Applicable Pressure | Read | |||
| AImin | 36 | Current Pressure Mod Press Reading | Read | |||
| AI | 41 | Pressure Module Sensor 1 Ser Num | Read | |||
| AI | 42 | Pressure Module Sensor 2 Ser Num | Read | |||
| AI | 43 | Pressure Module Sensor 3 Ser Num | Read | |||
| AI | 44 | Valve Test Mode State | Read | |||
| AI | 45 | VPS Min Calc Vlv Pwr Tim Req | s | Read | ||
| AI | 48 | Valve 1 Max Leak Det dur Lst VPS Seq | Read | |||
| AI | 49 | Valve 2 Max Leak Det dur Lst VPS Seq | Read | |||
| AI | 50 | VPS Min Test Time Req | s | Read | ||
| AI | 52 | Op Prs Val for LGP Lim SP | Read | |||
| AI | 53 | Op Prs Val for HGP Lim SP | Read | |||
| AImin | 64 | Fault Code Of Most Recent Fault | Read | |||
| AI | 65 | Time Stamp Of Most Recent Fault | Read | |||
| AI | 66 | Cycle Count Of Most Recent Fault | Read | |||
| AI | 67 | Fault Code Of Previous Fault | Read | |||
| AI | 68 | Time Stamp Of Previous Fault | Read | |||
| AI | 69 | Cycle Count Of Previous Fault | Read | |||
| AI | 70 | Valve Accumulated Op Time | h | Read | ||
| AI | 71 | Valve Accumulated Number of Cycles | Read | |||
| AI | 72 | Valve 1 Accum Hours during last VPS | h | Read | ||
| AI | 73 | Valve 1 Accum Cycles during last VPS | Read | |||
| AI | 74 | Valve 2 Accum Hours during last VPS | h | Read | ||
| AI | 75 | Valve 2 Accum Cycles during last VPS | Read | |||
| AI | 77 | Preigniton Calbiration S1 | Read | |||
| AI | 78 | Preigniton Test S1 | Read | |||
| AI | 79 | Preigniton Calbiration Gain S2A | Read | |||
| AI | 80 | Preigniton Calbiration Gain S2B | Read | |||
| AI | 81 | Preigniton Test Gain S2A | Read | |||
| AI | 82 | Preigniton Test Gain S2B | Read | |||
| BI | 7 | Valve MV1/MV2 LED | Read | |||
| BI | 9 | VPS Disable/Enable Status | Read | |||
| BI | 13 | VPS Relay Polarity | Read | |||
| BI | 25 | Reset Button | Read | |||
| BImin | 26 | MV1 Open | Read | |||
| BImin | 27 | MV2 Open | Read | |||
| BI | 28 | Fuel/Air Module Comm OK | Read | |||
| BI | 29 | Pressure Module Comm OK | Read | |||
| BI | 30 | Fuel/Air Module Check Valve | Read | |||
| BI | 31 | Safety Param Verification Req | Read | |||
| BImin | 32 | Lockout | Read | |||
| BI | 33 | Valve Cycle Counter Lim Reached | Read | |||
| BV | 1 | Selectable Units for Temperature | Write | |||
| BV | 4 | Selectable Volumetric Units | Write | |||
| MI | 8 | Body Size of Attached Valve | Read | |||
| MI | 14 | LGP Limit Lockout Type | Read | |||
| MI | 15 | HGP Limit Lockout Type | Read | |||
| MI | 18 | LGP and HGP Setup Indication | Read | |||
| MImin | 37 | Pressure Module Status | Read | |||
| MI | 38 | Pressure Module Sensor 1 Status | Read | |||
| MI | 39 | Pressure Module Sensor 2 Status | Read | |||
| MI | 40 | Pressure Module Sensor 3 Status | Read | |||
| MI | 46 | VPS Valve 1 Status | Read | |||
| MI | 47 | VPS Valve 2 Status | Read | |||
| MI | 51 | Hi/Lo Gas Pressure Function Status | Read | |||
| MImin | 54 | Valve System States | Read | |||
| MI | 55 | Valve 1 Demand | Read | |||
| MI | 56 | Valve 2 Demand | Read | |||
| MI | 57 | Interlock String | Read | |||
| MI | 58 | Proof of Closure Feedback | Read | |||
| MI | 59 | Sol 1 Feedback – Full Power Mode | Read | |||
| MI | 60 | Sol 2 Feedback – Full Power Mode | Read | |||
| MI | 61 | Sol 1 Feedback – Power Save Mode | Read | |||
| MI | 62 | Sol 2 Feedback – Power Save Mode | Read | |||
| MI | 63 | Sol 1 Fb for MV1 Rel Test – Full Pwr | Read | |||
| MI | 76 | Safety Param Verification Status | Read | |||
| MV | 2 | Selectable Units for Pressure | Write | |||
| MV | 3 | Selectable Units for Volumetric Flow | Write |
No points match these filters.
Integration notes
- Each device 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 device'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 for the multistate inputs.
- Several objects span more than one Modbus register (e.g. the user-entered valve name, 40255-40259), and some multistate inputs are two-bit fields inside one register.
- Remote Reset Command is mapped as a read-only AI.
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 SV2 gas valve - 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 SV2 gas valve - ProtoNode
How many BACnet points does the Laars SV2 gas valve - ProtoNode have?
This list has 82 BACnet objects: 44 analog inputs, 12 binary inputs, 2 binary values, 22 multi-state inputs, 2 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Laars SV2 gas valve - ProtoNode BACnet points are writable?
4 of the 82 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 SV2 gas valve - 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 SV2 gas valve - ProtoNode?
Start with MI 54 Valve System States (Valve system state code); BI 26 MV1 Open (Main valve 1 open); BI 27 MV2 Open (Main valve 2 open); AI 36 Current Pressure Mod Press Reading (Current pressure module reading); MI 37 Pressure Module Status (Pressure module status code); BI 32 Lockout (Valve in lockout); AI 24 Num of Currently Active Alarms (Number of active alarms); AI 64 Fault Code Of Most Recent Fault (Fault code of the latest fault).
How do I check these points on the real SV2 gas valve - 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 Multiburner control - ProtoNode
Laars boilers with the Multiburner control, read through a ProtoNode FPC-N34 gateway (the document does not name the models).
Also known as: Multiburner, Laars Multiburner, Multi-burner, 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
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.