Easy BACnet- Home
- BACnet points lists
- Cambridge Air Solutions
- BACnet Controller - MAU
Make-up air heater controller · BACnet points list
Cambridge Air Solutions BACnet Controller - MAU BACnet points list
Updated 11 November 2026
Cambridge's BACnet Controller is a BTL-listed, programmable MS/TP controller mounted in the heater that runs the fan and burner and gives a BAS access to its points. The object list is mostly multistate values (statuses, commands, HOA, modes, alarms) and analog values (temperatures, setpoints, delays, runtimes), with four binary values for runtime/cycle-count resets. Operating mode (unit heat, make-up air, make-up air with reset, summer vent, off) is selected with the Normal and Override Mode MVs.
This page lists 77 BACnet objects for the Cambridge Air Solutions BACnet Controller - MAU — 42 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Cambridge Air Solutions’s own free documentation, linked below.
- Manufacturer
- Cambridge Air Solutions
- Model
- BACnet Controller - MAU
- Equipment
- Make-up air heater controller
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 77 (42 writable)
- Transport
- BACnet MS/TP
- Firmware
- 4.0.3.0012
- Also known as
- Cambridge MAU controller, Cambridge BACnet Controller, Cambridge heater BACnet, MAU Technical Manual 4.0.3.0012
Reference only, provided as-is: verify against Cambridge Air Solutions’s current documentation and the live device before use. Not official Cambridge Air Solutions information. Terms of use.
BMS integration notes: Cambridge Air Solutions BACnet Controller - MAU
Enable the unit with MV-3011 Unit Enable Mode, choose the operating mode with MV-50052 Normal Mode (MV-50053 Override Mode for the alternate mode) and command occupancy with MV-3021 Occupancy Override or the controller's own schedule. Adjust the zone and discharge setpoints, read MV-3001 Unit Status, the burner/fan status MVs and the fault MVs, and reset faults with MV-50058. The controller runs stand-alone on its defaults (unit heater mode, 160°F discharge, 65°F zone) if the network is lost, provided a zone sensor is connected.
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 |
|---|---|---|---|
| MV 3011 | Unit Enable Mode | Shutdown / enable | Write |
| MV 3021 | Occupancy Override | Occupied / unoccupied / standby from the BAS | Write |
| MV 50052 | Normal Mode | Unit heat, make-up air, summer vent or off | Write |
| AV 3037 | Discharge Air Set Point – Makeup Air Mode | Discharge setpoint in make-up air mode | Write |
| AV 3017 | Occupied Zone Heating Set Point | Zone temp the burner heats to when occupied | Write |
| MV 50058 | Reset Unit Fault | Network fault reset | Write |
| MV 3001 | Unit Status | Heating / satisfied / cooling / sensor unreliable | Read |
| AV 3011 | Effective Discharge Air Temperature | Supply air temp leaving the unit, °F | Read |
| MV 3018 | Burner Status | Burner proven on | Read |
| MV 50056 | Burner Fault | Burner alarm | Read |
Enable & remote start
MV-3011 Unit Enable Mode (1=Shutdown, 2=Enable). Fan and burner Hand/Off/Auto overrides are MV-50050 Supply Fan HOA and MV-11 Burner HOA; leave them in Auto (3) for normal control.
Sensors & values from the BMS
Network values can replace the wired sensors: AV-3038 Network Override Outdoor Air Temperature and AV-3045 Network Override Zone Temperature. MV-50064 ZN-T Remote Setpoint Enable selects no remote setpoint, hardware only, network only, or network with hardware backup. The manual gives no timeout for these.
Network setup
- MS/TP only, up to 76.8 kbaud; MAC address 4-127 (default 4), set from the local display (Controller > Network) or a MAP gateway (AV-3003).
- Baud rate defaults to Auto (follows the bus supervisor); the manual suggests 38400 when used with a Smart Building Hub.
- Device Object ID (AV-3004) must be unique; BACnet Encoding Type must match the rest of the network.
- Disconnect from the bus while changing network settings and cycle power afterwards.
- An EOL terminator is needed when the controller is at either end of the MS/TP trunk.
Watch out for
- The heating lockout (AV-3010) stops the burner whenever outdoor temperature is above it, even with a heating call.
- In summer vent mode with SF Bypass = No, the fan will not run if outdoor temperature is above zone temperature.
- Continuous Fan Operation in Occupied (MV-50065) decides whether the fan keeps running when the zone is satisfied in the reset & on/off mode.
- Some faults also need a reset from the local display (Commissioning > Overrides > Unit Reset) or MV-50058.
Cambridge Air Solutions BACnet Controller - MAU 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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AV | 3032 | Supply Fan Output (optional) | Hardware point AO:2 | % | Read | |
| AV | 3039 | Filter pressure (optional) | Hardware point AI:5 | in. w.c. | Read | |
| MV | 50051 | Filter status (optional) | Hardware point BI:7 | Read | 0=Normal, 1=Alarm | |
| MV | 50055 | Mode Switch (optional) | Hardware point BI:4 | Read | 0=Normal, 1=Override | |
| BV | 0 | Burner Runtime Reset | Write | 0=Off, 1=Reset | ||
| BV | 1 | Burner Cycle Count Reset | Write | 0=Off, 1=Reset | ||
| BV | 2 | Supply Fan Runtime Reset | Write | 0=Off, 1=Reset | ||
| BV | 3 | Supply Fan Cycle Count Reset | Write | 0=Off, 1=Reset | ||
| MV | 11 | Burner HOA | Write | 1=Hand, 2=Off, 3=Auto | ||
| MV | 1577 | Burner Modulation Mode | Write | 1=Auto, 2=Manual | ||
| MVmin | 3001 | Unit Status | Read | 1=Heating, 2=Satisfied, 3=Cooling, 4=Temperature Unreliable | ||
| MV | 3006 | Units | Write | 1=IP, 2=SI | ||
| MV | 3007 | FCB Baud Rate | Write | 1=Auto, 2=1200, 3=9600, 4=19200, 5=38400, 6=76800 | ||
| MV | 3008 | Operating Baud Rate | Baud rate in use (see FCB Baud Rate states) | Read | ||
| MV | 3009 | PID Tuning Reset | Write | 1=Off, 2=Reset | ||
| MV | 3010 | Occupancy Schedule | Occupancy schedule reference | Write | ||
| MVmin | 3011 | Unit Enable Mode | Write | 1=Shutdown, 2=Enable | ||
| MV | 3012 | Effective Occupancy | Read | Occupied / Unoccupied | ||
| MV | 3016 | Supply Fan Status | Hardware point BI:2 | Read | 1=Off, 2=On | |
| MV | 3017 | Unit Reset Fault | Hardware point BI:3 | Read | 1=Normal, 2=Alarm | |
| MVmin | 3018 | Burner Status | Hardware point BI:1 | Read | 1=Off, 2=On | |
| MV | 3019 | Burner Command | Hardware point BO:4 | Read | 1=Off, 2=On | |
| MV | 3020 | Supply Fan Command | Hardware point BO:5 | Read | 1=Off, 2=On | |
| MVmin | 3021 | Occupancy Override | Write | 1=Occupied, 2=UnOccupied, 3=Bypass, 4=Standby, 5=Not Set | ||
| MV | 3022 | Emergency Heat Enabled | Read | 1=Inactive, 2=Active | ||
| MV | 50050 | Supply Fan HOA | Write | 1=Hand, 2=Off, 3=Auto | ||
| MVmin | 50052 | Normal Mode | Write | 1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off | ||
| MV | 50053 | Override Mode | Write | 1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off | ||
| MV | 50054 | Effective Mode | Read | 1=Unit Heat, 2=Makeup Air, 3=Makeup Air w/Reset, 4=Makeup Air w/Reset & On-Off, 5=Summer Vent, 6=Off | ||
| MVmin | 50056 | Burner Fault | Read | 1=Normal, 2=Alarm | ||
| MV | 50057 | Supply Fan Fault | Read | 1=Normal, 2=Alarm | ||
| MVmin | 50058 | Reset Unit Fault | Write | 1=Off, 2=Reset | ||
| MV | 50059 | Zone Temperature Sensor Failure | Read | 1=Normal, 2=Alarm | ||
| MV | 50060 | Supply Air Temperature Sensor Failure | Read | 1=Normal, 2=Alarm | ||
| MV | 50061 | Outdoor Air Temperature Sensor Failure | Read | 1=Normal, 2=Alarm | ||
| MV | 50062 | DAT Low Temperature Alarm | Read | 1=Normal, 2=Lockout | ||
| MV | 50063 | Heater Lockout Alarm | Read | 1=Normal, 2=Lockout | ||
| MV | 50064 | ZN-T Remote Setpoint Enable | Write | 1=No remote Setpoint, 2=Hardware Only, 3=Network Only, 4=Network with Hardware Backup | ||
| MV | 50065 | Continuous Fan Operation in Occupied | Write | 1=No, 2=Yes | ||
| MV | 50066 | SF Bypass | Write | 1=No, 2=Yes | ||
| AV | 130 | Zone Low Limit + Differential | °F | Write | ||
| AV | 756 | Discharge Air Set Point – Unit Heat Mode | °F | Read | ||
| AV | 1382 | Burner Modulation Set Point | % | Read | ||
| AV | 3003 | Device Address | Write | |||
| AV | 3004 | Device Object ID | Write | |||
| AV | 3007 | Zone Low Limit Set Point | °F | Write | ||
| AV | 3008 | Effective Cooling Set Point | °F | Read | ||
| AV | 3009 | Effective Heating Set Point | °F | Read | ||
| AV | 3010 | Heating Lockout Set Point | °F | Write | ||
| AVmin | 3011 | Effective Discharge Air Temperature | Hardware point AI:6 | °F | Read | |
| AV | 3012 | Discharge Air High Set Point | °F | Write | ||
| AV | 3014 | Discharge Air Low Set Point | °F | Write | ||
| AV | 3015 | Occupied Zone Cooling Set Point | °F | Write | ||
| AV | 3016 | Unoccupied Zone Cooling Set Point | °F | Write | ||
| AVmin | 3017 | Occupied Zone Heating Set Point | °F | Write | ||
| AV | 3018 | Unoccupied Zone Heating Set Point | °F | Write | ||
| AV | 3019 | Effective Outdoor Temperature | Hardware point AI:8 | °F | Read | |
| AV | 3020 | Effective Zone Temperature | Hardware point AI:9 | °F | Read | |
| AV | 3026 | Modulated Burner Control | Hardware point AO:1 | % | Read | |
| AV | 3029 | Application Software Version | Read | |||
| AV | 3030 | Effective Discharge Air Set Point | °F | Read | ||
| AV | 3031 | Supply Fan Speed (optional) | % | Write | ||
| AV | 3033 | Burner Runtime | hours | Read | ||
| AV | 3034 | Burner Cycle Count | Read | |||
| AV | 3035 | Supply Fan Runtime | hours | Read | ||
| AV | 3036 | Supply Fan Cycle Count | Read | |||
| AVmin | 3037 | Discharge Air Set Point – Makeup Air Mode | °F | Write | ||
| AV | 3038 | Network Override Outdoor Air Temperature | °F | Write | ||
| AV | 3040 | Filter Pressure Offset | in. w.c. | Write | ||
| AV | 3041 | Fan Fault Delay | seconds | Write | ||
| AV | 3042 | Burner Fault Delay | seconds | Write | ||
| AV | 3043 | Low Temperature Cutout Setpoint | °F | Write | ||
| AV | 3044 | Low Temperature Cutout Delay | seconds | Write | ||
| AV | 3045 | Network Override Zone Temperature | °F | Write | ||
| AV | 3046 | Zone Differential | °F | Write | ||
| AV | 7018 | AI1 Max Value | in. w.c. | Write | ||
| AV | 7019 | AI1 Output Range High | in. w.c. | Write |
No points match these filters.
Object ID lookup: Cambridge Air Solutions MAU Controller point IDs by name
AV3032Supply Fan Output (optional)AV3039Filter pressure (optional)MV50051Filter status (optional)MV50055Mode Switch (optional)BV0Burner Runtime ResetBV1Burner Cycle Count ResetBV2Supply Fan Runtime ResetBV3Supply Fan Cycle Count ResetMV11Burner HOAMV1577Burner Modulation ModeMV3001Unit StatusMV3006UnitsMV3007FCB Baud RateMV3008Operating Baud RateMV3009PID Tuning ResetMV3010Occupancy ScheduleMV3011Unit Enable ModeMV3012Effective OccupancyMV3016Supply Fan StatusMV3017Unit Reset FaultMV3018Burner StatusMV3019Burner CommandMV3020Supply Fan CommandMV3021Occupancy OverrideMV3022Emergency Heat EnabledMV50050Supply Fan HOAMV50052Normal ModeMV50053Override ModeMV50054Effective ModeMV50056Burner FaultMV50057Supply Fan FaultMV50058Reset Unit FaultMV50059Zone Temperature Sensor FailureMV50060Supply Air Temperature Sensor FailureMV50061Outdoor Air Temperature Sensor FailureMV50062DAT Low Temperature AlarmMV50063Heater Lockout AlarmMV50064ZN-T Remote Setpoint EnableMV50065Continuous Fan Operation in OccupiedMV50066SF BypassAV130Zone Low Limit + DifferentialAV756Discharge Air Set Point – Unit Heat ModeAV1382Burner Modulation Set PointAV3003Device AddressAV3004Device Object IDAV3007Zone Low Limit Set PointAV3008Effective Cooling Set PointAV3009Effective Heating Set PointAV3010Heating Lockout Set PointAV3011Effective Discharge Air TemperatureAV3012Discharge Air High Set PointAV3014Discharge Air Low Set PointAV3015Occupied Zone Cooling Set PointAV3016Unoccupied Zone Cooling Set PointAV3017Occupied Zone Heating Set PointAV3018Unoccupied Zone Heating Set PointAV3019Effective Outdoor TemperatureAV3020Effective Zone TemperatureAV3026Modulated Burner ControlAV3029Application Software VersionAV3030Effective Discharge Air Set PointAV3031Supply Fan Speed (optional)AV3033Burner RuntimeAV3034Burner Cycle CountAV3035Supply Fan RuntimeAV3036Supply Fan Cycle CountAV3037Discharge Air Set Point – Makeup Air ModeAV3038Network Override Outdoor Air TemperatureAV3040Filter Pressure OffsetAV3041Fan Fault DelayAV3042Burner Fault DelayAV3043Low Temperature Cutout SetpointAV3044Low Temperature Cutout DelayAV3045Network Override Zone TemperatureAV3046Zone DifferentialAV7018AI1 Max ValueAV7019AI1 Output Range High
Integration notes
- Optional points (mode switch, filter status/pressure, supply fan output and speed) exist only on units with those options.
- Rows from the input/output tables point to the same MV/AV objects as the value tables; hardware terminal numbers are kept in the description.
- The input/output tables show binary states as 0/1 while the MV table shows the same objects as 1/2; both are kept as printed.
- MV-50052/50053/50054 share one mode state list in the source (merged cell).
- Temperatures in °F by default (MV-3006 selects IP/SI); filter pressure in in. w.c.
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 BACnet Controller - MAU 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 Cambridge Air Solutions BACnet Controller - MAU
How many BACnet points does the Cambridge Air Solutions BACnet Controller - MAU have?
This list has 77 BACnet objects: 39 analog values, 4 binary values, 34 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Cambridge Air Solutions BACnet Controller - MAU BACnet points are writable?
42 of the 77 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.
Where is the official Cambridge Air Solutions BACnet Controller - MAU BACnet documentation?
The source is Operating Instructions - BACnet Controller - MAU (BACnet Controller MAU Technical Manual) (Version 4.0.3.0012), revision 2022-11-30, published free by Cambridge Air Solutions at https://www.cambridge-eng.com/Portals/0/Operating%20Instructions%20v4_0_3_0012.pdf.
What are the minimum BACnet points to integrate the Cambridge Air Solutions BACnet Controller - MAU?
Start with MV 3011 Unit Enable Mode (Shutdown / enable); MV 3021 Occupancy Override (Occupied / unoccupied / standby from the BAS); MV 50052 Normal Mode (Unit heat, make-up air, summer vent or off); AV 3037 Discharge Air Set Point – Makeup Air Mode (Discharge setpoint in make-up air mode); AV 3017 Occupied Zone Heating Set Point (Zone temp the burner heats to when occupied); MV 50058 Reset Unit Fault (Network fault reset); MV 3001 Unit Status (Heating / satisfied / cooling / sensor unreliable); AV 3011 Effective Discharge Air Temperature (Supply air temp leaving the unit, °F); MV 3018 Burner Status (Burner proven on); MV 50056 Burner Fault (Burner alarm).
How do I enable BMS control of the Cambridge Air Solutions BACnet Controller - MAU?
MV-3011 Unit Enable Mode (1=Shutdown, 2=Enable). Fan and burner Hand/Off/Auto overrides are MV-50050 Supply Fan HOA and MV-11 Burner HOA; leave them in Auto (3) for normal control.
Can the BMS supply sensor values to the Cambridge Air Solutions BACnet Controller - MAU?
Network values can replace the wired sensors: AV-3038 Network Override Outdoor Air Temperature and AV-3045 Network Override Zone Temperature. MV-50064 ZN-T Remote Setpoint Enable selects no remote setpoint, hardware only, network only, or network with hardware backup. The manual gives no timeout for these.
How do I check these points on the real BACnet Controller - MAU?
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 Cambridge Air Solutions BACnet points lists
Source: Operating Instructions - BACnet Controller - MAU (BACnet Controller MAU Technical Manual) · Version 4.0.3.0012 · rev. 2022-11-30. Object names, instances and units are reproduced as published; descriptions are our own.