Humidifier controller · BACnet points list

DriSteem Vapor-logic 6 BACnet points list

Updated 28 October 2026

Short answer

Vapor-logic 6 is the DriSteem humidifier control board. Modbus is standard; BACnet MS/TP (terminal P7) or BACnet/IP (Ethernet) is an option enabled with an unlock code matched to the serial number. One shared object table covers all humidifier types, so many objects only apply to a specific product (marked GTS, XT, HPS, LMH, WM, XV or STS in the name).

This page lists 136 BACnet objects for the DriSteem Vapor-logic 6 — 85 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from DriSteem’s own free documentation, linked below.

Manufacturer: DriSteem
Model: Vapor-logic 6
Equipment: Humidifier controller
Equipment type: Humidifiers
BACnet objects: 136 (85 writable)
Transport: BACnet MS/TP, BACnet IP
Firmware: Not stated
Default device instance: 255
Also known as: Vapor-logic, Vapor-logic version 6, VL6, Vaporlogic, DriSteem humidifier controller
Source document: Vapor-logic Version 6 Installation, Operation, and Maintenance Manual (Table 75-1 Interoperability variable and object names) · VL6-IOM-EN-REVH-0225 · rev. 2025-02 (Rev H)

Download CSV 136 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: DriSteem Vapor-logic 6

Integration in brief

Unlock and enable BACnet on the keypad, set the device instance and MS/TP station or IP settings, and set 'BACnet controlled' to Yes under Control via BACnet if the BMS will send the demand. Then write the demand to AV 9 (percent) or AV 8 (mass), or let the controller run its own PID on SpaceRHSetPoint (AV 5), and use MSV 1 RunMode for auto/standby/drain.

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 1	RunMode	Run mode: auto, local/system standby, manual drain	Write
AV 9	FieldbusDemandPcnt	Demand from the BMS in % of capacity	Write
AV 5	SpaceRHSetPoint	Space RH setpoint when Vapor-logic does the control	Write
BV 4	ClearAllActiveAlarms	Write 1 to clear all active faults	Write
AI 1	SpaceRH	Space RH measured by the humidifier	Read
AV 2	SteamOutputPercent	Estimated steam output %	Read
AI 5	SteamDemandPercent	Demand the unit is acting on, % of capacity	Read
BV 60	MainEnableOpen	Main enable input open (demand ignored)	Write
BV 3	ActiveManualClearAlarmsExist	A manual-clear alarm exists	Read

Enable & remote start

The humidifier must have its Main Enable input (P20) closed or jumpered (J402 shunt), otherwise the demand is ignored (message BV 60). RunMode (MSV 1) switches between Auto, Local standby, System standby and Manual drain; to let BACnet supply the demand, set Setup > Control via BACnet > BACnet controlled = Yes (default No).

Sensors & values from the BMS

No BMS-writable sensor values are listed: space RH, dew point and duct RH are read-only AIs from the controller's own transmitters. The BMS can instead send a demand (AV 8 FieldbusDemandMass or AV 9 FieldbusDemandPcnt, write-only) and setpoints (AV 5 space RH, AV 6 dew point, AV 7 duct high limit).

Network setup

Device instance defaults to 255 (0-4194303); MS/TP station 1, Max masters 127, Max info frames 1.
BACnet comm channel defaults to 19200 MS/TP; options run from BACnet IP up to 76800 MS/TP; MS/TP wiring lands on terminal P7.
BACnet/IP uses UDP 47808 by default (1024-65535); default IP 192.168.1.195/24, gateway 192.168.1.1, DHCP off.
Device instance and comm settings are set from the keypad/display; some items are not available in the web interface.

Watch out for

FieldbusDemandMass/Pcnt are write-only; a request above capacity runs the unit at 100 %.
Many objects only apply to one humidifier type; unused ones may read 0.
WaterUntilADS/WaterUntilService scale differently on Modbus (x100) than on BACnet (1 lb or kg).
Retrofitting BACnet needs a purchased unlock code tied to the unit serial number.

DriSteem Vapor-logic 6 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.

136 of 136 shown

Type

Multi-state

Access

Units

Show

DriSteem Vapor-logic 6 BACnet Points List
			Description			States
AImin	1	SpaceRH	Relative humidity content of the air in the space being humidified	%	Read
AI	2	SpaceDewPoint	Dew point of the air in the space being humidified	°F or °C	Read
AI	3	DuctRH	Relative humidity content of air in the duct	%	Read
AI	4	SteamDemandMass	Steam demand in pounds or kilograms per hour	lbs/hr or kg/h	Read
AImin	5	SteamDemandPercent	Steam demand as a percentage of the humidifier’s total capacity	%	Read
AI	6	AuxTemp	Temperature of auxiliary temperature sensor	°F or °C	Read
AI	7	TankTemperature / WaterTemperature (HPS)	Temperature of the water in the humidifier’s evaporating chamber	°F or °C	Read
AV	1	SteamOutputMass	Estimated amount of steam the humidifier is producing in pounds or kilograms...	lbs/hr or kg/h	Read
AVmin	2	SteamOutputPercent	Estimated amount of steam the humidifier is producing as a percentage of...	%	Read
AV	3	WaterUntilADS	Pounds or kilograms of water remaining to be converted to steam before...	lbs or kg	Write
AV	4	WaterUntilService	Pounds or kilograms of water remaining to be converted to steam before...	lbs or kg	Write
AI	8	MTSteamDemandMass	MT steam demand mass	lbs/hr or kg/h	Read
AI	9	MTSteamDemandPercent	MT steam demand percent	%	Read
AI	10	XTBottle1Current (XT)	XT operating current	A	Read
AI	11	XTBottle2Current (XT)	XT operating current, right cylinder	A	Read
AI	12	InPressure (HPS)	Input (supply) pressure	psi or bar	Read
AI	13	OutPressure (HPS)	Output pressure	psi or bar	Read
AI	14	CurrentTankCOC (WM)	Current tank COC		Read
AI	15	SupplyWaterConductivity (WM)	Supply water conductivity in µS	µS	Read
AI	16	Stage1Temperature (WM)	Stage 1 temperature	°F or °C	Read
AI	17	Stage2Temperature (WM)	Stage 2 temperature	°F or °C	Read
AI	18	WM: Stage3Temperature / GTS: FlueTemperature	Stage 3 temperature (WM) Temperature of the LX flue box (GTS)	°F or °C	Read
AI	19	WM: SupplyAirTemperature / GTS: DrainTemperature	Supply air temperature (WM) Temperature of the water in the drain block...	°F or °C	Read
AI	20	Stage1MediaEffectiveness (WM)	Stage 1 media effectiveness	%	Read
AI	21	Stage2MediaEffectiveness (WM)	Stage 2 media effectiveness	%	Read
AI	22	Stage3MediaEffectiveness (WM)	Stage 3 media effectiveness	%	Read
AI	23	OutputTemperature (WM)	Output temperature	°F or °C	Read
AI	24	WetbulbTemperature (WM)	Wetbulb temperature	°F or °C	Read
AI	25	StoragePressure (LMH)	Storage pressure	psi or bar	Read
AI	26	PumpRuntimeHours (HPS, LMH)	Pump runtime hours	hours	Read
AI	27	TDS (LMH)	TDS		Read
AI	28	HPASActivePumpStationNumber (HPS)	Active pump station number		Read
MVmin	1	RunMode	Mode of the unit or system		Write	1=Auto, 2=Local standby, 3=System standby, 4=Manual drain, 5=Test outputs, 6=Test run
MV	2	MTRunMode	MT run mode		Write	1=System standby, 2=System auto
AVmin	5	SpaceRHSetPoint	Humidity set point for the space being humidified	%	Write
AV	6	SpaceDewPointSetPoint	Dew point set point for the space being humidified	°F or °C	Write
AV	7	DuctHighLimitSetPoint	Duct high limit set point	%	Write
AV	8	FieldbusDemandMass	Steam output (as demanded via fieldbus) in pounds or kilograms per hour	lbs/hr or kg/h	Write
AVmin	9	FieldbusDemandPcnt	Steam output (as demanded via the fieldbus) as a percentage of the...	%	Write
AV	10	PIDBand	PID band	%	Write
AV	11	PIDKp	PID-Kp (proportional gain) factor		Write
AV	12	PIDKi	PID-Ki (integral gain) factor		Write
AV	13	PIDKd	PID-Kp (derivative gain) factor		Write
AV	14	MTSteamOutputReqMass	MT fieldbus request for steam in pounds or kilograms per hour	lbs/hr or kg/h	Write
AV	15	MTSteamOutputReqPcnt	MT fieldbus request for steam in percentage of system capacity	%	Write
AV	16	Pumps1RuntimeHours (HPS, LMH)	Number of hours pump 1 has run since reset	hours	Write
AV	17	Pump2RuntimeHours (HPS)	Number of hours pump 2 has run since reset	hours	Write
AV	18	TargetCOC (WM)	Desired cycles at concentration		Write
AV	19	HPASPumpSelected (HPS)	Selected pump (HPS systems only)		Write	0=Pump 1, 1=Pump 2
BI	1	AirflowProvingSwitch			Read	0=Open, 1=Closed
BI	2	DuctHLSwitch			Read	0=Open, 1=Closed
BI	3	SafetyInterlock			Read	0=Open, 1=Closed
BI	4	GTS: CombustionAirDamper / HPS: Stage1Active			Read	0=Damper Closed, 1=Damper Open
BI	5	GTS: FluePressureSwitch / HPS: Stage2Active / LMH: InletPressureSwitch			Read	GTS/LMH: 0=Open, 1=Closed; HPS: 0=Closed, 1=Open
BI	6	GTS: PowerVentSwitch / HPS: Stage3Active / STS: XVHeaderEmptyOrExternalDemand			Read	GTS: 0=Off, 1=On; HPS: 0=Closed, 1=Open; STS: 0=Not ready, 1=Ready
BI	7	LowWaterSensorOrOvertempLoop (GTS)			Read	0=No Water, 1=Water
BI	8	MTActiveFaultInSystem			Read	0=No, 1=Yes
BI	9	MTActiveMessageInSystem			Read	0=No, 1=Yes
BI	10	HighWaterSensor (XT)			Read	0=No Water, 1=Water
BI	11	HighWaterSensor2 (XT)			Read	0=No Water, 1=Water
BI	12	HPASVFDDriveFault (HPS)			Read	0=No Fault, 1=Fault
BI	13	XV2PositionValveEndSwitch (XV)			Read	0=Open, 1=Closed
BI	14	XVFloatSwitch (XV)			Read	0=Empty, 1=Full
BV	1	ProgOutput1StatusNO-1	Programmable dry contact 1 status		Read	0=Open, 1=Closed
BV	2	ProgOutput2StatusNO-2	Programmable dry contact 2 status		Read	0=Open, 1=Closed
BVmin	3	ActiveManualClearAlarmsExist	Flag that a manual clear alarm exists in the system		Read
BVmin	4	ClearAllActiveAlarms	When set will clear all active faults		Write
BV	5	TankTempSensorFailed / WaterTempSensorFailed (HPS)	Alarm flag (see Alarms menu table)		Write
BV	6	TankOvertemp-UnitRebootRequired	Alarm flag (see Alarms menu table)		Write
BV	7	SignalAtRHInputOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	8	DuctRHSignalOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	9	AuxTempSenseOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	10	WaterProbeMiswired	Alarm flag (see Alarms menu table)		Write
BV	11	FaultyWaterProbe / VFDFault (HPS)	Alarm flag (see Alarms menu table)		Write
BV	12	ExcessiveFillTime	Alarm flag (see Alarms menu table)		Write
BV	13	ExcessiveRefillTime	Alarm flag (see Alarms menu table)		Write
BV	14	TankNotDraining / CheckHumidifierFloats (LMH)	Alarm flag (see Alarms menu table)		Write
BV	15	ExcessiveBoilTime-UnitRebootRequired	Alarm flag (see Alarms menu table)		Write
BV	16	NoSDUAirflow	Alarm flag (see Alarms menu table)		Write
BV	17	GTS: NoPowerVentAirflow / STS: XVHeaderFlooded	Alarm flag (see Alarms menu table)		Write
BV	18	NoCombustionAirflow (GTS)	Alarm flag (see Alarms menu table)		Write
BV	19	BlockedFlue (GTS)	Alarm flag (see Alarms menu table)		Write
BV	20	Burner1Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	21	Burner2Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	22	Burner3Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	23	Burner4Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	24	GTS: IgnitionModule1Fault / WM: Stage1EfficiencyBelow50Percent	Alarm flag (see Alarms menu table)		Write
BV	25	GTS: IgnitionModule2Fault / WM: Stage2EfficiencyBelow50Percent	Alarm flag (see Alarms menu table)		Write
BV	26	GTS: IgnitionModule3Fault / WM: Stage3EfficiencyBelow50Percent	Alarm flag (see Alarms menu table)		Write
BV	27	IgnitionModule4Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	28	GTS: Blower1Fault / WM: TempSensorStage1Fault	Alarm flag (see Alarms menu table)		Write
BV	29	GTS: Blower2Fault / WM: TempSensorStage2Fault	Alarm flag (see Alarms menu table)		Write
BV	30	GTS: Blower3Fault / WM: TempSensorStage3Fault	Alarm flag (see Alarms menu table)		Write
BV	31	GTS: Blower4Fault / WM: TempSensorFault	Alarm flag (see Alarms menu table)		Write
BV	32	GasValve1Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	33	GasValve2Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	34	GasValve3Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	35	GasValve4Fault (GTS)	Alarm flag (see Alarms menu table)		Write
BV	36	GTS: LowWaterOrOvertemp / Electric/LMH: OvertempCutoutUnitRebootRequired	Alarm flag (see Alarms menu table)		Write
BV	37	XT: ExcessiveFoaming2 / HPS/LMH: LowInletPressure / GTS: ReplaceIgnitorsNow!	Alarm flag (see Alarms menu table)		Write
BV	51	CurrentSensorOutOfRange (XT)	Alarm flag (see Alarms menu table)		Write
BV	52	XT: CurrentSensorOutOfRange (XT) / HPS: ROSensorOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	53	XT: Overcurrent / HPS: HighInletPressure	Alarm flag (see Alarms menu table)		Write
BV	54	XT: SupplyWaterFailure / HPS: LowInletWaterTemp	Alarm flag (see Alarms menu table)		Write
BV	55	XT: ExcessiveFoaming / HPS: HighPumpPressure / GTS: FoamingFault	Alarm flag (see Alarms menu table)		Write
BV	57	XT: Overcurrent2 / HPS: HighInletWaterTemp	Alarm flag (see Alarms menu table)		Write
BV	58	XT: SupplyWater2Failure / HPS: LowPumpPressure	Alarm flag (see Alarms menu table)		Write
BV	61	LowInletPressure (LMH)	Alarm flag (see Alarms menu table)		Write
BV	62	HighOutletPressure (LMH)	Alarm flag (see Alarms menu table)		Write
BV	63	HPS: InletSensorOutOfRange / LMH: StorageSensorOutOfRange / GTS: FlueSensorOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	64	ExcessiveTDSAlarm (LMH)	Alarm flag (see Alarms menu table)		Write
BV	66	PumpStationCannonRun (HPS)	HPS redundant system cannot run		Write
BV	68	XVCondensateClearingFailure (XV)	XV has failed to clear the header of condensate		Write
BV	69	XV2PositionValveFailure (XV)	XV 2 position valve end switch failed to close while the valve...		Write
BV	70	HPS: PumpSensorOutOfRange / LMH: InletSensorOutOfRange / GTS: DrainSensorOutOfRange	Alarm flag (see Alarms menu table)		Write
BV	38	GTS: ReplaceIgnitorsSoon / Electric/LMH: ReplaceContactors / WM: ReplaceUV Lamp	Message flag (see Diagnostics menu table)		Write
BV	39	ServiceUnit	Message flag (see Diagnostics menu table)		Write
BV	40	DrainPending	Message flag (see Diagnostics menu table)		Write
BV	41	NoAirflow	Message flag (see Diagnostics menu table)		Write
BV	42	InterlockOpen	Message flag (see Diagnostics menu table)		Write
BV	43	FreezeDrain	Message flag (see Diagnostics menu table)		Write
BV	44	EndOfSeasonDrainActive	Message flag (see Diagnostics menu table)		Write
BV	45	TempCompOn	Message flag (see Diagnostics menu table)		Write
BV	46	CleanProbes	Message flag (see Diagnostics menu table)		Write
BV	47	DuctHLTrip	Message flag (see Diagnostics menu table)		Write
BV	48	DuctHLSpan	Message flag (see Diagnostics menu table)		Write
BV	49	InsufficientWaterFlow	Message flag (see Diagnostics menu table)		Write
BV	50	BoilingTempCalibrated	Message flag (see Diagnostics menu table)		Write
BV	56	XT: CheckCylinderEndOfLife / HPS: LowInletWaterTempMessage	Message flag (see Diagnostics menu table)		Write
BV	59	CheckCylinder2EndOfLife (XT)	Message flag (see Diagnostics menu table)		Write
BVmin	60	MainEnableOpen	Message flag (see Diagnostics menu table)		Write
BV	65	ExcessiveTDSDuringFill (LMH)	Message flag (see Diagnostics menu table)		Write
BV	67	XVClearingCondensate (XV)	XV is attempting to clear condensate out of the header		Read
BV	101	FillValve			Read	0=Closed, 1=Open
BV	102	DrainValve			Read	0=Not Draining, 1=Draining
BV	103	XV: 2 position shutoff valve			Read	0=Valve not powered, 1=Valve powered

Integration notes

Object names prefixed with GTS:, HPS:, XT:, WM:, LMH:, STS: or XV: only apply to that humidifier type; where two types share an instance the names are joined with ' / '.
BACnet must be purchased/unlocked: Setup > Tank Setup > Communication > BACnet, enter the unlock code, choose the comm channel, then cycle power.
Units follow the controller's I-P or SI setting (e.g. lbs/hr or kg/h, °F or °C, psi or bar).
Fault and message BVs (BV 5-70) are listed RW in the manual; see the controller's alarm and diagnostics tables for their meaning.

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 Vapor-logic 6 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 DriSteem Vapor-logic 6

How many BACnet points does the DriSteem Vapor-logic 6 have?

This list has 136 BACnet objects: 28 analog inputs, 19 analog values, 14 binary inputs, 73 binary values, 2 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which DriSteem Vapor-logic 6 BACnet points are writable?

85 of the 136 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 DriSteem Vapor-logic 6 BACnet documentation?

The source is Vapor-logic Version 6 Installation, Operation, and Maintenance Manual (Table 75-1 Interoperability variable and object names) (VL6-IOM-EN-REVH-0225), revision 2025-02 (Rev H), published free by DriSteem at https://d2tsmyh31fn7w8.cloudfront.net/public-documents/docs/iom/vapor-logic/VL6-IOM-EN.pdf.

What are the minimum BACnet points to integrate the DriSteem Vapor-logic 6?

Start with MV 1 RunMode (Run mode: auto, local/system standby, manual drain); AV 9 FieldbusDemandPcnt (Demand from the BMS in % of capacity); AV 5 SpaceRHSetPoint (Space RH setpoint when Vapor-logic does the control); BV 4 ClearAllActiveAlarms (Write 1 to clear all active faults); AI 1 SpaceRH (Space RH measured by the humidifier); AV 2 SteamOutputPercent (Estimated steam output %); AI 5 SteamDemandPercent (Demand the unit is acting on, % of capacity); BV 60 MainEnableOpen (Main enable input open (demand ignored)); BV 3 ActiveManualClearAlarmsExist (A manual-clear alarm exists).

How do I enable BMS control of the DriSteem Vapor-logic 6?

Can the BMS supply sensor values to the DriSteem Vapor-logic 6?

How do I check these points on the real Vapor-logic 6?

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: Vapor-logic Version 6 Installation, Operation, and Maintenance Manual (Table 75-1 Interoperability variable and object names) · VL6-IOM-EN-REVH-0225 · rev. 2025-02 (Rev H). Object names, instances and units are reproduced as published; descriptions are our own.