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Rooftop unit / air handler controller (gateway) · BACnet points list
AAON VCM Controller (legacy, via PT-Link II BACnet gateway) BACnet points list
Updated 6 November 2026
AAON's PT-Link II BACnet5 gateway connects AAON controller loops to a BACnet MS/TP network. For the VCM controller it exposes 104 objects: setpoints, offsets and the schedule force as writable AVs, plus read-only temperatures, humidity, pressures, damper and VFD signals, unit mode, control status, enable flags and alarms.
This page lists 104 BACnet objects for the AAON VCM Controller (legacy, via PT-Link II BACnet gateway) — 21 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from AAON’s own free documentation, linked below.
- Manufacturer
- AAON
- Model
- VCM Controller (legacy, via PT-Link II BACnet gateway)
- Equipment
- Rooftop unit / air handler controller (gateway)
- Equipment type
- Rooftop units, AHUs & DOAS
- BACnet objects
- 104 (21 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 50000 + MS/TP MAC address
- Also known as
- VCM, AAON VCM, PT-Link II, PT-Link BACnet5, G114680
Reference only, provided as-is: verify against AAON’s current documentation and the live device before use. Not official AAON information. Terms of use.
BMS integration notes: AAON VCM Controller (legacy, via PT-Link II BACnet gateway)
Wire the PT-Link II to the AAON controller loop and to the BACnet MS/TP trunk, set its MAC address and baud rate, and check the device instance. The BAS schedules the unit with SchdFrc (AV 66) and adjusts the occupied and supply air setpoints; status, temperatures and alarms are read-only objects.
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 66 | SchdFrc | Occupancy: 0 auto, 1 forced on, 2 forced off | Write |
| AV 42 | OcpClSt | Occupied cooling mode enable setpoint | Write |
| AV 43 | OcpHtSt | Occupied heating mode enable setpoint | Write |
| AV 77 | SaClSt | Supply air cooling setpoint | Write |
| AV 78 | SaHtSt | Supply air heating setpoint | Write |
| AI 123 | UnitMode | Occupancy mode in effect | Read |
| AI 4 | CtrlSts | Control status bits (demand, enables) | Read |
| AI 72 | SpcTp | Space temperature | Read |
| AI 83 | SaTp | Supply air temperature | Read |
| AI 1 | AlmSts | Summary of active alarm groups | Read |
Enable & remote start
SchdFrc (AV 66) sets occupancy: 0 = auto/unoccupied (the controller's own schedule and inputs decide), 1 = forced on, 2 = forced off.
Network setup
- MS/TP MAC address must be 1-127; baud 9600, 19200, 38400 or 76800 is set on the PT-Link.
- Device instance = Device Instance ID (default 50,000) + MS/TP MAC address; change the ID on the PT-Link web Configuration page.
- The PT-Link web page defaults to 192.168.1.24 (user admin, password on the ProtoCessor label); AAON supports BACnet MS/TP only.
Watch out for
- Alarm group and relay objects are bit-coded; decode them with the bit tables in the guide.
- Points for MODGAS, REHEAT, preheat and expansion boards report only when that hardware is connected.
AAON VCM Controller (legacy, via PT-Link II BACnet gateway) 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 | |||||
|---|---|---|---|---|---|---|
| AI | 99 | AppVer | Application Software Version | Read | ||
| AI | 7 | ClSt | Occupied Mode Enable Cooling Setpoint Mirror | Read | ||
| AI | 31 | HtSt | Occupied Mode Enable Heating Setpoint Mirror | Read | ||
| AI | 55 | OaWtbl | Outdoor Air Wetbulb | Read | ||
| AI | 84 | TpDmnd | Temperature Demand | Read | ||
| AImin | 72 | SpcTp | Space Temperature | Read | ||
| AImin | 83 | SaTp | Supply Air Temperature | Read | ||
| AI | 64 | RaTp | Return Air Temperature | Read | ||
| AI | 54 | OaTp | Outdoor Air Temperature | Read | ||
| AI | 14 | DuctPr | Duct Static Pressure | Read | ||
| AI | 52 | OaRh | Outdoor Air Humidity | Read | ||
| AImin | 123 | UnitMode | Unit Mode | Read | 0=Unoccupied, 1=Remote Contact Occupied, 2=Normal Schedule Occupied, 3=Push Button or Zone Override, 4=Holiday Mode Active, 5=Unoccupied Zone Demand, 6=Remote Schedule Override, 7=Current Output Force Mode, 8=SAT High or Low Cut Off, 9=CO2 Override In Progress, 10=Purge Mode Active | |
| AImin | 4 | CtrlSts | Control Status | Read | ||
| BI | 5 | ClDmnd | Cooling Demand | Read | ||
| BI | 29 | HtDmnd | Heating Demand | Read | ||
| BI | 113 | DehmDmnd | Dehumidification Demand | Read | ||
| BI | 6 | ClEnbl | Cooling Enabled | Read | ||
| BI | 30 | HtEnbl | Heating Enabled | Read | ||
| BI | 15 | EcoEnbl | Economizer Enabled | Read | ||
| BI | 25 | FanDly | Fan Start Up Delay | Read | ||
| BI | 90 | WmupDmnd | Warm Up Mode Active | Read | ||
| BI | 57 | PofCfg | Proof of Flow Configured | Read | ||
| BI | 3 | CO2Cfg | CO Sensor Installed 2 | Read | ||
| BI | 39 | MdHt2Ins | MODGAS II Connected | Read | ||
| BI | 58 | Rt2Ins | REHEAT II Connected | Read | ||
| AI | 44 | OnRlys | On Board Relays | Read | ||
| AI | 111 | ExRlys12 | External Relays 1-2 | Read | ||
| AI | 112 | ExRlys34 | External Relays 3-4 | Read | ||
| AI | 16 | EcoPos | Economizer Position | Read | ||
| AI | 88 | VfdBwPos | VFD Blower Fan | Read | ||
| AI | 89 | VfdExPos | VFD Relief Fan | Read | ||
| AImin | 1 | AlmSts | Alarm Status | Read | ||
| AI | 104 | AlrmGrp1 | Alarm Group 1 | Read | ||
| AI | 105 | AlrmGrp2 | Alarm Group 2 | Read | ||
| AI | 106 | AlrmGrp3 | Alarm Group 3 | Read | ||
| BI | 2 | SaTpAlm | Bad Supply Air Sensor | Read | ||
| BI | 117 | OaTpAlm | Outdoor Air Temperature Lost | Read | ||
| BI | 101 | SpcTpAlm | Space Temperature Sensor Lost | Read | ||
| BI | 94 | MchClAlm | Mechanical Cooling Alarm | Read | ||
| BI | 95 | MchHtAlm | Mechanical Heating Alarm | Read | ||
| BI | 26 | PofAlm | Fan Proving Alarm | Read | ||
| BI | 96 | DrtFlAlm | Dirty Filter Detected | Read | ||
| BI | 119 | SmokeAlm | Smoke Detector Alarm | Read | ||
| BI | 37 | LoSaAlm | Low Supply Air Temperature Alarm | Read | ||
| BI | 33 | HiSaAlm | High Supply Air Temperature Alarm | Read | ||
| BI | 108 | CtrlTpCF | Control Temperature Cool Failure | Read | ||
| BI | 109 | CtrlTpHF | Control Temperature Heat Failure | Read | ||
| AI | 9 | CtrlTp | Control Temperature | Read | ||
| AI | 67 | InRh | Indoor Humidity | Read | ||
| AI | 114 | InRhStM | Indoor RH Setpoint Mirror | Read | ||
| AI | 110 | DptStM | Dewpoint Setpoint Mirror | Read | ||
| AI | 115 | MdClPos | Modulating Cool Position | Read | ||
| AI | 116 | MdHtPos | Modulating Heat Position | Read | ||
| AI | 38 | MdHt2Pos | Modulating Gas Valve Position | Read | ||
| AI | 60 | Rt2Pos | Reheat Value Position | Read | ||
| AVmin | 42 | OcpClSt | Occupied Mode Enable Cooling Setpoint (limits 0 to 99) | Write | ||
| AVmin | 43 | OcpHtSt | Occupied Mode Enable Heating Setpoint (limits 0 to 99) | Write | ||
| AV | 124 | UnClOst | Unoccupied Cooling Offset (limits 0 to 30) | Write | ||
| AV | 125 | UnHtOst | Unoccupied Heating Offset (limits 0 to 30) | Write | ||
| AV | 92 | WtblSt | Wet Bulb Setpoint (limits 0 to 80) | Write | ||
| AVmin | 77 | SaClSt | SAT/Reset Source Cooling Setpoint (limits 40 to 80) | Write | ||
| AVmin | 78 | SaHtSt | SAT/Reset Source Heating Setpoint (limits 40 to 200) | Write | ||
| AV | 91 | WmupSt | Warm Up Setpoint (limits 50 to 90) | Write | ||
| AV | 71 | SpcTpOst | Space Sensor Offset (limits -100 to 100) | Write | ||
| AV | 80 | SaTpOst | Supply Air Sensor Offset (limits -100 to 100) | Write | ||
| AV | 65 | RaTpOst | Return Air Sensor Offset (limits -100 to 100) | Write | ||
| AV | 53 | OaTpOst | Outdoor Air Sensor Offset (limits -100 to 100) | Write | ||
| AV | 107 | CoilTpSt | Coil Temperature Setpoint (limits 35 to 70) | Write | ||
| AV | 13 | DptSt | Dewpoint Setpoint (limits 35 to 80) | Write | ||
| AV | 120 | InRhSt | Indoor Humidity Setpoint (limits 0 to 100) | Write | ||
| AV | 152 | DuctPrSt | Static Pressure Setpoint (limits 0.01 to 3) | Write | ||
| AV | 118 | RfPrSt | Relief Pressure Setpoint (limits -0.2 to 0.2) | Write | ||
| AVmin | 66 | SchdFrc | Schedule Force (limits 0 to 2) | Write | 0=Auto/Unoccupied Mode, 1=Forced On, 2=Forced Off | |
| BI | 127 | OnRly1 | On Board Relay 1 | Read | ||
| BI | 128 | OnRly2 | On Board Relay 2 | Read | ||
| BI | 129 | OnRly3 | On Board Relay 3 | Read | ||
| BI | 130 | OnRly4 | On Board Relay 4 | Read | ||
| BI | 131 | OnRly5 | On Board Relay 5 | Read | ||
| BI | 133 | ExRly1 | Expansion Relay 1 | Read | ||
| BI | 134 | ExRly2 | Expansion Relay 2 | Read | ||
| BI | 135 | ExRly3 | Expansion Relay 3 | Read | ||
| BI | 136 | ExRly4 | Expansion Relay 4 | Read | ||
| BI | 137 | ExRly5 | Expansion Relay 5 | Read | ||
| BI | 138 | ExRly6 | Expansion Relay 6 | Read | ||
| BI | 139 | ExRly7 | Expansion Relay 7 | Read | ||
| BI | 140 | ExRly8 | Expansion Relay 8 | Read | ||
| BI | 141 | ExRly9 | Expansion Relay 9 | Read | ||
| BI | 142 | ExRly10 | Expansion Relay 10 | Read | ||
| BI | 143 | ExRly11 | Expansion Relay 11 | Read | ||
| BI | 144 | ExRly12 | Expansion Relay 12 | Read | ||
| BI | 145 | ExRly13 | Expansion Relay 13 | Read | ||
| BI | 146 | ExRly14 | Expansion Relay 14 | Read | ||
| BI | 147 | ExRly15 | Expansion Relay 15 | Read | ||
| BI | 148 | ExRly16 | Expansion Relay 16 | Read | ||
| AV | 149 | CO2St | CO Setpoint 2 (limits 0 to 3000) | Write | ||
| AV | 151 | MinEcoSt | Minimum Outdoor Air Setpoint (limits 1 to 100) | Write | ||
| AI | 150 | CO2Level | Return Air CO Level 2 | Read | ||
| AI | 153 | ByPasDmp | Bypass Damper Position | Read | ||
| AI | 154 | RaDmp | Return Damper Position | Read | ||
| AI | 62 | RfPr | Relief Pressure | Read | ||
| AI | 47 | OaDwpt | Outdoor Air Dewpoint | Read | ||
| AI | 181 | CoilTp | Coil Temperature | Read | ||
| AI | 82 | SaTpStM | Current Supply Air Setpoint | Read | ||
| AV | 196 | PreHtSp | Preheater Setpoint (limits 0 to 100) | Write |
No points match these filters.
Object ID lookup: AAON VCM (PT-Link II) point IDs by name
AI99AppVerAI7ClStAI31HtStAI55OaWtblAI84TpDmndAI72SpcTpAI83SaTpAI64RaTpAI54OaTpAI14DuctPrAI52OaRhAI123UnitModeAI4CtrlStsBI5ClDmndBI29HtDmndBI113DehmDmndBI6ClEnblBI30HtEnblBI15EcoEnblBI25FanDlyBI90WmupDmndBI57PofCfgBI3CO2CfgBI39MdHt2InsBI58Rt2InsAI44OnRlysAI111ExRlys12AI112ExRlys34AI16EcoPosAI88VfdBwPosAI89VfdExPosAI1AlmStsAI104AlrmGrp1AI105AlrmGrp2AI106AlrmGrp3BI2SaTpAlmBI117OaTpAlmBI101SpcTpAlmBI94MchClAlmBI95MchHtAlmBI26PofAlmBI96DrtFlAlmBI119SmokeAlmBI37LoSaAlmBI33HiSaAlmBI108CtrlTpCFBI109CtrlTpHFAI9CtrlTpAI67InRhAI114InRhStMAI110DptStMAI115MdClPosAI116MdHtPosAI38MdHt2PosAI60Rt2PosAV42OcpClStAV43OcpHtStAV124UnClOstAV125UnHtOstAV92WtblStAV77SaClStAV78SaHtStAV91WmupStAV71SpcTpOstAV80SaTpOstAV65RaTpOstAV53OaTpOstAV107CoilTpStAV13DptStAV120InRhStAV152DuctPrStAV118RfPrStAV66SchdFrcBI127OnRly1BI128OnRly2BI129OnRly3BI130OnRly4BI131OnRly5BI133ExRly1BI134ExRly2BI135ExRly3BI136ExRly4BI137ExRly5BI138ExRly6BI139ExRly7BI140ExRly8BI141ExRly9BI142ExRly10BI143ExRly11BI144ExRly12BI145ExRly13BI146ExRly14BI147ExRly15BI148ExRly16AV149CO2StAV151MinEcoStAI150CO2LevelAI153ByPasDmpAI154RaDmpAI62RfPrAI47OaDwptAI181CoilTpAI82SaTpStMAV196PreHtSp
Integration notes
- Objects are served by the AAON PT-Link II gateway, which reads the controller over its RS-485 loop; object names are the PT-Link data names (SchdFrc, SpcTp and so on).
- Per the guide, AI and BI objects are read-only and AV objects are read/write; sensor inputs are read-only. No units column; AV limits are added to descriptions.
- Unit Mode and Control Status enumerations are listed in the guide's property identifier page; alarm group and relay objects are bit strings described there.
- The VCM is the legacy controller; its Control Status object is a bit string rather than an enumeration.
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 VCM Controller (legacy, via PT-Link II BACnet gateway) 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 AAON VCM Controller (legacy, via PT-Link II BACnet gateway)
How many BACnet points does the AAON VCM Controller (legacy, via PT-Link II BACnet gateway) have?
This list has 104 BACnet objects: 38 analog inputs, 21 analog values, 45 binary inputs. The exact set on a given unit depends on its firmware, installed options and configuration.
Which AAON VCM Controller (legacy, via PT-Link II BACnet gateway) BACnet points are writable?
21 of the 104 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 AAON VCM Controller (legacy, via PT-Link II BACnet gateway) BACnet documentation?
The source is PT-Link II BACnet5 Technical Guide - BACnet Properties and PT-Link Data Array Cross Reference for VCM (G114680 Rev A), revision 2022-10-12, published free by AAON at https://23126496.fs1.hubspotusercontent-na1.net/hubfs/23126496/G114680_PTLinkII_BACnet5_vA_221012.pdf.
What are the minimum BACnet points to integrate the AAON VCM Controller (legacy, via PT-Link II BACnet gateway)?
Start with AV 66 SchdFrc (Occupancy: 0 auto, 1 forced on, 2 forced off); AV 42 OcpClSt (Occupied cooling mode enable setpoint); AV 43 OcpHtSt (Occupied heating mode enable setpoint); AV 77 SaClSt (Supply air cooling setpoint); AV 78 SaHtSt (Supply air heating setpoint); AI 123 UnitMode (Occupancy mode in effect); AI 4 CtrlSts (Control status bits (demand, enables)); AI 72 SpcTp (Space temperature); AI 83 SaTp (Supply air temperature); AI 1 AlmSts (Summary of active alarm groups).
How do I enable BMS control of the AAON VCM Controller (legacy, via PT-Link II BACnet gateway)?
SchdFrc (AV 66) sets occupancy: 0 = auto/unoccupied (the controller's own schedule and inputs decide), 1 = forced on, 2 = forced off.
How do I check these points on the real VCM Controller (legacy, via PT-Link II BACnet gateway)?
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 AAON BACnet points lists
- Rooftop unit / air handler controller
AAON Touchscreen Controller
AAON packaged units fitted with the AAON Touchscreen unit controller.
Also known as: AAON Touchscreen, Touch Screen Controller, AAON TS controller - Rooftop unit controller (zoning)
AAON Auto-Zone 3 (AZ 3) Controller
AAON packaged units run by the Auto-Zone 3 controller, alone or with AZ 3 VAV/zone dampers.
Also known as: AZ 3, AZ3, Auto-Zone 3, AAON AZ3, G071000, SS8014, SS8015, Orion AZ3 - General-purpose BACnet I/O controller
AAON BACnet General Controller (BGC)
AAON BGC general-purpose controller with 8 analog inputs, 8 binary inputs, 8 relays and 4 analog outputs.
Also known as: AAON BGC, BGC Controller, AAON BACnet General Controller, G042460, AAON general purpose I/O controller - DX chiller controller
AAON DX Chiller Controller
AAON packaged DX chillers (non-Turbocor compressors) with the Main DX Chiller Controller, refrigerant modules and optional waterside economizer and evaporative condenser modules.
Also known as: AAON DX Chiller Controller, Main DX Chiller Controller, G054280, SS1149, AAON DX chiller BACnet - DX chiller controller
AAON LF Chiller Controller
AAON LF series one- or two-circuit DX chillers with the LF Chiller Main Controller, optional pumping package and waterside economizer.
Also known as: AAON LF Chiller, LF Chiller Main Controller, G059100, SS1131, DT005683-001, LF chiller BACnet - DX chiller controller
AAON Main DX Barrel Chiller Controller
AAON DX barrel chillers with the Main DX Barrel Chiller Controller, up to two barrels and three refrigerant circuits per barrel, with optional pumping, WSE, evaporative condenser and vestibule modules.
Also known as: AAON DX Barrel Chiller, Main DX Barrel Chiller Controller, G070300, SS1140, DX barrel chiller BACnet - Air handler preheat controller
AAON PREHEAT-X Controller
AAON PREHEAT-X controllers that stage and modulate electric (SCR/SSR) preheat on AAON units and air handlers.
Also known as: PREHEAT-X, PREHEATX, Preheat-X, G086640, AAON preheat controller, Orion PREHEAT-X - Rooftop unit / air handler controller (gateway)
AAON SA Controller (via PT-Link II BACnet gateway)
AAON units with the SA (single-zone) controller, reached through the AAON PT-Link II BACnet MS/TP gateway.
Also known as: SA controller, AAON SA, PT-Link II, PT-Link BACnet5, G114680 - Rooftop unit / air handler controller
AAON Stratus Unit Manager (Stratus controls)
AAON units built with Stratus controls (Stratus Unit Manager, software 1.3.3).
Also known as: Stratus, AAON Stratus, Stratus Unit Manager, Stratus BACnet Points Guide, Stratus controller, Stratus Series - VAV / zone controller
AAON VAV/Zone BACnet Controller (VAVZB)
Pressure-independent and pressure-dependent VAV boxes and zone dampers controlled by the AAON VAV/Zone BACnet controller.
Also known as: VAVZB, VAV/Zone Controller, ASM02426, ASM02427, ASM02661, ASM02662, SS1116, SS1146, G067750 - Rooftop unit / air handler controller
AAON VCB-X Controller
AAON packaged rooftop units, air handlers, DOAS and water-source units controlled by the Orion VCB-X (OE335-26B-VCBX) unit controller.
Also known as: VCBX, VCB-X, Orion VCB-X, OE335-26B-VCBX, V28940, WattMaster VCB-X, AAON VCB-X BACnet - Rooftop unit / air handler controller
AAON VCCX-454 Controller
AAON rooftop units, air handlers, DOAS and self-contained units built for R-454B and controlled by the VCCX-454 unit controller with RM454 refrigerant modules.
Also known as: VCCX-454, VCCX 454, ASM07503, SS1188, AAON VCCX-454 controller, R-454B unit controller - Rooftop unit / air handler controller
AAON VCCX-454-GH Controller (grow house)
AAON R-454B units for indoor agriculture (grow rooms) controlled by the VCCX-454-GH controller.
Also known as: VCCX-454-GH, VCCX454-GH, ASM07792, SS1207, AAON grow house controller, indoor agriculture HVAC controller - Rooftop unit / air handler controller
AAON VCCX2 Controller
AAON rooftop units, air handlers and DOAS units controlled by the VCCX2 (ASM01698) unit controller.
Also known as: VCC-X2, VCCX, VCC-X, ASM01698, Orion VCCX2, SS1088 - Rooftop unit / air handler controller (gateway)
AAON VCM-X Controller (via PT-Link II BACnet gateway)
AAON rooftop units, air handlers and other equipment with the VCM-X controller, reached through the AAON PT-Link II BACnet MS/TP gateway.
Also known as: VCM-X, VCMX, PT-Link II, PT-Link BACnet5, G114680
Source: PT-Link II BACnet5 Technical Guide - BACnet Properties and PT-Link Data Array Cross Reference for VCM · G114680 Rev A · rev. 2022-10-12. Object names, instances and units are reproduced as published; descriptions are our own.