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Boiler cascade controller via ProtoNode gateway · BACnet points list
Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) BACnet points list
Updated 28 October 2026
Hamilton Engineering's BDB-CDB control is read over Modbus RTU by a ProtoNode FPC-N54 and served on BACnet IP or BACnet MS/TP. The 99-object profile has writable central heating, DHW, indirect DHW, pool and spa setpoints, cascade sensor readings and an anomaly code, then a 9-object block for each of BCB1 to BCB8. This file lists the cascade objects and the BCB1 block.
This page lists 36 BACnet objects for the Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) — 18 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Hamilton Engineering’s own free documentation, linked below.
- Manufacturer
- Hamilton Engineering
- Model
- BDB-CDB (ProtoNode FPC-N54)
- Equipment
- Boiler cascade controller via ProtoNode gateway
- Equipment type
- Boilers & water heaters
- BACnet objects
- 36 (18 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 50032 (Node_Offset default 50,000 + the BDB-CDB Node-ID 32)
- Also known as
- BDB-CDB, BDB, CDB, ProtoNode FPC-N54, FPC-N54-1776, Hamilton ProtoNode
BMS integration notes: Hamilton Engineering BDB-CDB (ProtoNode FPC-N54)
Wire the BDB-CDB Modbus port (9600, 8N1) to the ProtoNode R1 port, pick BACnet IP or BACnet MS/TP in the Web Configurator, add the BDB-CDB profile with Node-ID 32, and discover the device at 50032. Setpoints are the writable analog values; status and fault information comes from the cascade anomaly and the per-board working status and anomaly codes.
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 2 | CH Requests | Central heating request; values not defined in the guide | Write |
| AV 11 | Boiler For Heating Setpoint | Boiler setpoint for the heating load | Write |
| AV 12 | Dhw SP Temp | Domestic hot water setpoint | Write |
| AI 31 | BCB1 Working Status | BCB1 working status | Read |
| AI 21 | Cascade S1 Temp Sensor Value | Cascade sensor S1 temperature | Read |
| AI 27 | Cascade Anomaly | Cascade-level anomaly (fault) code | Read |
| AI 32 | BCB1 Anom Code 1 | BCB1 anomaly code | Read |
Network setup
- Device instance = Node_Offset (default 50,000) + Node-ID; the BDB-CDB profile uses Node-ID 32, so 50032 by default.
- Modbus side (R1 port): Modbus RTU 9600, 8N1. BMS RS-485 on the R2 port; bias resistors are DIP switches on each port.
- Default IP 192.168.1.24 (255.255.255.0); the field protocol is chosen with the Protocol Selector in the Web Configurator.
- Each ProtoNode on a subnet needs its own BACnet Network Number (default 50001).
Watch out for
- Boiler blocks repeat every 9 instances (BCB n = BCB1 + 9 x (n - 1)); only BCB1 is listed here.
- The guide gives no units, ranges or code tables; confirm values with Hamilton Engineering.
Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) 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 | System Configuration | System configuration value | Read | ||
| AVmin | 2 | CH Requests | Central heating requests | Write | ||
| AV | 3 | CH SP / CH Offset 1 | CH setpoint or CH offset 1 | Write | ||
| AV | 4 | CH SP / CH Offset 2 | CH setpoint or CH offset 2 | Write | ||
| AV | 5 | CH SP / CH Offset 3 | CH setpoint or CH offset 3 | Write | ||
| AV | 6 | CH SP / CH Offset 4 | CH setpoint or CH offset 4 | Write | ||
| AV | 7 | CH SP / CH Offset 5 | CH setpoint or CH offset 5 | Write | ||
| AV | 8 | CH SP / CH Offset 6 | CH setpoint or CH offset 6 | Write | ||
| AV | 9 | CH SP / CH Offset 7 | CH setpoint or CH offset 7 | Write | ||
| AV | 10 | CH SP / CH Offset 8 | CH setpoint or CH offset 8 | Write | ||
| AVmin | 11 | Boiler For Heating Setpoint | Boiler setpoint for heating | Write | ||
| AVmin | 12 | Dhw SP Temp | Domestic hot water setpoint | Write | ||
| AV | 13 | Recirculation SP For Cascade Reg | Recirculation setpoint for cascade regulation | Write | ||
| AV | 14 | Idhw SP Temp | Indirect DHW setpoint | Write | ||
| AV | 15 | Boiler For Idhw Load Setpoint | Boiler setpoint for indirect DHW load | Write | ||
| AV | 16 | Ispa SP Temp | Spa setpoint | Write | ||
| AV | 17 | Boiler For Pool Load Setpoint | Boiler setpoint for pool load | Write | ||
| AV | 18 | Ipool SP Temp | Pool setpoint | Write | ||
| AV | 19 | Boiler For Spa Load Setpoint | Boiler setpoint for spa load | Write | ||
| AI | 20 | Cascade Temp Sensors State | Cascade sensor status | Read | ||
| AImin | 21 | Cascade S1 Temp Sensor Value | Cascade sensor S1 temperature | Read | ||
| AI | 22 | Cascade S2 Temp Sensor Value | Cascade sensor S2 temperature | Read | ||
| AI | 23 | Cascade S3 Temp Sensor Value | Cascade sensor S3 temperature | Read | ||
| AI | 24 | Cascade S4 Temp Sensor Value | Cascade sensor S4 temperature | Read | ||
| AI | 25 | Cascade S5 Temp Sensor Value | Cascade sensor S5 temperature | Read | ||
| AI | 26 | Cascade S6 Temp Sensor Value | Cascade sensor S6 temperature | Read | ||
| AImin | 27 | Cascade Anomaly | Cascade anomaly (fault) code | Read | ||
| AI | 28 | BCB1 Temp Sensors State | BCB1 sensor status | Read | ||
| AI | 29 | BCB1 T1 Temp Sensor Value | BCB1 sensor T1 temperature | Read | ||
| AI | 30 | BCB1 T2 Temp Sensor Value | BCB1 sensor T2 temperature | Read | ||
| AImin | 31 | BCB1 Working Status | BCB1 working status | Read | ||
| AImin | 32 | BCB1 Anom Code 1 | BCB1 anomaly code 1 | Read | ||
| MI | 33 | BCB1 Anom Code 2 Prefix | BCB1 anomaly code 2, prefix | Read | ||
| MI | 34 | BCB1 Anom Code 2 Suffix | BCB1 anomaly code 2, suffix | Read | ||
| AI | 35 | BCB1 Fan Modulation Relative Per | BCB1 fan modulation, relative | % | Read | |
| AI | 36 | BCB1 Fan Modulation Absolute Per | BCB1 fan modulation, absolute | % | Read |
No points match these filters.
Integration notes
- Per-boiler blocks repeat every 9 objects: BCB n = the BCB1 instance + 9 x (n - 1), so BCB2 is AI/MI 37-45 and BCB8 is AI/MI 91-99.
- The guide only names the device BDB-CDB and does not expand BCB; it does not say which Hamilton products use it.
- The table has no read/write column, units or state texts; access is inferred from object type (AV writable, AI/MI read only).
- The two anomaly code 2 parts are multistate inputs; their state texts are not given.
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 BDB-CDB (ProtoNode FPC-N54) 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 Hamilton Engineering BDB-CDB (ProtoNode FPC-N54)
How many BACnet points does the Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) have?
This list has 36 BACnet objects: 16 analog inputs, 18 analog values, 2 multi-state inputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) BACnet points are writable?
18 of the 36 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 Hamilton Engineering BDB-CDB (ProtoNode FPC-N54) BACnet documentation?
The source is ProtoNode FPC-N54 Start-up Guide for Interfacing Hamilton Engineering Products: BDB-CDB (Document Revision 2.A (Web Configurator Template Revision 3)), revision 2019-06, published free by Hamilton Engineering at https://hamiltonengineering.com/wp-content/uploads/ProtoNode-FPC-N54-Start-up-Guide-06.19.pdf.
What are the minimum BACnet points to integrate the Hamilton Engineering BDB-CDB (ProtoNode FPC-N54)?
Start with AV 2 CH Requests (Central heating request; values not defined in the guide); AV 11 Boiler For Heating Setpoint (Boiler setpoint for the heating load); AV 12 Dhw SP Temp (Domestic hot water setpoint); AI 31 BCB1 Working Status (BCB1 working status); AI 21 Cascade S1 Temp Sensor Value (Cascade sensor S1 temperature); AI 27 Cascade Anomaly (Cascade-level anomaly (fault) code); AI 32 BCB1 Anom Code 1 (BCB1 anomaly code).
How do I check these points on the real BDB-CDB (ProtoNode FPC-N54)?
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 FPC-N54 Start-up Guide for Interfacing Hamilton Engineering Products: BDB-CDB · Document Revision 2.A (Web Configurator Template Revision 3) · rev. 2019-06. Object names, instances and units are reproduced as published; descriptions are our own.