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BW437-RTU-LX rooftop unit wall controller (Onyxx LX)

Rooftop unit controller (wall-mount) · BACnet points list

Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) BACnet points list

Updated 12 November 2026Unofficial source

Short answer

The BW437-RTU-LX is a wall-mounted thermostat-style controller with built-in room temperature, humidity, CO2 and motion sensing that runs a rooftop unit or heat pump from preset applications (MSV 127). On BACnet MS/TP it exposes its seven relays, four analog outputs and inputs, setpoints, demands, economizer and humidity settings, and a long list of configuration multi-states.

This page lists 106 BACnet objects for the Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) — 65 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Lynxspring’s documentation hosted by Cochrane Supply, not by Lynxspring itself, so treat it as unofficial.

Manufacturer: Lynxspring
Model: BW437-RTU-LX rooftop unit wall controller (Onyxx LX)
Equipment: Rooftop unit controller (wall-mount)
Equipment type: Rooftop units, AHUs & DOAS
BACnet objects: 106 (65 writable)
Transport: BACnet MS/TP
Firmware: Onyxx LX UI software 4.0 or later, firmware 1.058 or later
Also known as: BW437-RTU-LX, BW437-RTU, BW437RTU, Onyxx LX BW437 RTU, Onyxx LX RTU wall controller
Source document: BW437-RTU-LX Wall Controller Quick Guide (unofficial copy, hosted by Cochrane Supply)

Download CSV 106 rows Download EDE B.I.G.-EU JSON Source PDF (unofficial copy) ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Lynxspring’s current documentation and the live device before use. Not official Lynxspring information. Terms of use.

BMS integration notes: Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX)

Integration in brief

Pick the application in MSV 127, then command occupancy (MSV 6), system mode (MSV 3) and fan mode (MSV 4) from the BMS and adjust the occupied setpoints. Read room temperature, effective occupancy, supply air temperature and the help/alarm message.

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 3	MODE	System mode (Off/Auto/Cool/Heat)	Write
MV 6	Loc-Occ	Occupancy command	Write
MV 4	FAN	Fan mode (On/Auto)	Write
AV 35	OccCLSP	Occupied cooling setpoint	Write
AV 36	OccHTSP	Occupied heating setpoint	Write
MV 5	Eff_Occ	Effective occupancy mode	Read
AI 5	RoomT	Room temperature	Read
AV 16	SATemp	Supply air temperature	Read
BV 7	Freeze_Status	Freeze condition active	Read
MV 100	HELP_mess	Help/alarm message (fan lock, frozen, filter)	Read

Network setup

Network settings are entered in CONFIG MODE on the controller keypad.
A jumper sets the end-of-line termination on the last MS/TP node.
Firmware updates use the supplied USB-COM adapter or a USB to MS/TP converter cable.

Watch out for

Changing MSV 127 (application preset) reassigns the outputs and their descriptions.
Outdoor air temperature (AV 29) needs a sensor input or external value assigned in MSV 27.

Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) 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.

106 of 106 shown

Type

Multi-state

Access

Units

Show

Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) BACnet Points List
			Description			States
AI	1	AI_1	Analog input 1		Read
AI	2	AI_2	Analog input 2		Read
AI	3	AI_3	Analog input 3		Read
AI	4	AI_4	Analog input 4		Read
AImin	5	RoomT	Room temperature	°F	Read
AI	6	RoomRH	Room humidity	%	Read
AI	7	RoomCO2	Room CO2	ppm	Read
AO	1	AO_ECM	Based on MSV127 config	%	Read
AO	2	AO_2	Based on MSV127 config	%	Read
AO	3	AO_3	Based on MSV127 config	%	Read
AO	4	AO_4	Based on MSV127 config	%	Read
BI	1	Motion	Motion detection		Read	0=Off, 1=Active
BO	1	BO_1	Based on MSV127 config		Read	0=Off, 1=On
BO	2	BO_2	Based on MSV127 config		Read	0=Off, 1=On
BO	3	BO_3	Based on MSV127 config		Read	0=Off, 1=On
BO	4	BO_4	Based on MSV127 config		Read	0=Off, 1=On
BO	5	BO_5	Based on MSV127 config		Read	0=Off, 1=On
BO	6	BO_6	Based on MSV127 config		Read	0=Off, 1=On
BO	7	BO_7	Based on MSV127 config		Read	0=Off, 1=On
AV	1	RoomTSP	Room Temperature setpoint	°F	Write
AV	6	HTG_Dem	Heating demand	%	Read
AV	7	CLG_Dem	Cooling demand	%	Read
AV	9	Eff_T	Effective temperature used for control	°F	Read
AVmin	16	SATemp	Supply air temperature	°F	Read
AV	19	SATFRSP_Set	Set supply freezing temperature	°F	Read
AV	21	ECM_min_Set	Fan analog min. output	%	Write
AV	24	Fan_MinOn_Time	Fan minimum ON time	min	Write
AV	27	OvrTime_Set	Set occupancy override time	min	Write
AV	29	OATemp	Outdoor air temperature	°F	Read
AV	31	CO2_SP_Set	Set CO2 Setpoint	ppm	Write
AV	33	MinCLSP	Set minimum cooling setpoint	°F	Write
AV	34	MaxHTSP	Set maximum heating setpoint	°F	Write
AVmin	35	OccCLSP	Set occupied cooling setpoint	°F	Write
AVmin	36	OccHTSP	Set occupied heating setpoint	°F	Write
AV	37	SP_DB_Set	Set deadband	°F	Write
AV	38	Unoc_CL_Set	Set unoccupied cooling setpoint	°F	Write
AV	39	Unoc_HT_Set	Set unoccupied heating setpoint	°F	Write
AV	40	STBCoolOffset	Set standby cooling offset (+)	°F	Write
AV	41	STBHeatOffset	Set standby heating offset (-)	°F	Write
AV	42	EffCLSP	Effective cooling setpoint		Read
AV	43	EffHTSP	Effective heating setpoint		Read
AV	50	RT_Cal	Room temperature calib	°F	Write
AV	51	Eff_RH	Effective humidity used for control	%	Read
AV	52	HUM_SP	Set humidity setpoint	%	Write
AV	53	SAH	Supply humidity reading	%	Read
AV	54	SAH_HL_Set	Supply humidity high limit setpoint	%	Write
AV	55	DEH_SP	Set dehum setpoint	%	Write
AV	56	SAT_HL_Set	Set supply air high limit setpoint	°F	Write
AV	57	SAT_CTR_Set	Set supply air neutral setpoint	°F	Write
AV	58	SAT_LL_Set	Set supply air low limit setpoint	°F	Write
AV	59	Eff_SAT	Effective supply air calc. setpoint	°F	Read
AV	60	ComprLockout	Compressor Lockout	°F	Write
AV	65	EconoMin_Pos	Eco min position	%	Write
AV	66	EconoMaxCO2Pos	Econo max position (for CO2)	%	Write
AV	67	OATheatOutAuth	Heating authorization (from OAT)	°F	Write
AV	68	OATeconOutAuth	Economizer authorization (from OAT)	°F	Write
AV	75	OAH	Outside air humidity	%	Read
AV	76	OAE	Outside air enthalpy	BTU/lb	Read
AV	77	EnthSP	Enthalpy setpoint	BTU/lb	Write
AV	78	MatSP	Mixed air temperature for economizer	°F	Write
AV	79	MAT	Mixed air temperature	°F	Read
BV	2	OVRSTAT	Occupancy override status		Read	0=Normal, 1=Overrid
BV	3	Mot_Det	Motion detection		Read	0=None, 1=Moving
BV	4	AutogenDesc	Autogenerate I/O descriptions		Write	0=Off, 1=On
BV	5	Occ_Sch	System occupancy schedule		Read	0=Off, 1=On
BVmin	7	Freeze_Status	Freeze condition status		Read	0=Normal, 1=Active
BV	8	Free_CL_Status	Free cooling authorization status		Read	0=No, 1=Yes
BV	21	EnthalpyAuth	Enthalpy Authorize		Read	0=No, 1=Yes
MV	1	CFGSens	Remote thermistor 10K		Write	1=Type 3, 2=Type 2
MV	2	AI_RS	Select room temperature input		Write	1=Intern, 2=AI-1, 3=AI_2, 4=AI-3, 5=AI-4
MVmin	3	MODE	System mode		Write	1=Off, 2=Auto, 3=Cool, 4=Heat
MVmin	4	FAN	Set fan mode		Write	1=On, 2=Auto
MVmin	5	Eff_Occ	Effective occupancy mode		Read	1=Occupied, 2=Unoccup, 3=TempOcc, 4=Standby
MVmin	6	Loc-Occ	Occupancy command		Write	1=Loc_Occ, 2=Occupied, 3=Unoccup
MV	7	CFG_Y1	Set cooling output 1 operation		Write	1=None, 2=Off-On, 3=0-10V D(direct), 4=0-10V R(reversed), 5=2-10V D(direct), 6=2-10V R(reversed), 7=Pulsed D(direct), 8=Pulsed R(reversed)
MV	8	CFG_Y2	Set cooling output 2 operation		Write	1=None, 2=Off-On, 3=0-10V D(direct), 4=0-10V R(reversed), 5=2-10V D(direct), 6=2-10V R(reversed), 7=Pulsed D(direct), 8=Pulsed R(reversed)
MV	9	CFG_Y3	Set cooling output 3 operation		Write	1=None, 2=Off-On
MV	10	CFG_Y4	Set cooling output 4 operation		Write	1=None, 2=Off-On
MV	16	CFG_W1	Set heating output 1 operation		Write	1=None, 2=Off-On, 3=0-10V D(direct), 4=0-10V R(reversed), 5=2-10V D(direct), 6=2-10V R(reversed), 7=Pulsed D(direct), 8=Pulsed R(reversed), 9=O (O/B), 10=B (O/B)
MV	17	CFG_W2	Set heating output 2 operation		Write	1=None, 2=Off-On, 3=0-10V D(direct), 4=0-10V R(reversed), 5=2-10V D(direct), 6=2-10V R(reversed), 7=Pulsed D(direct), 8=Pulsed R(reversed), 9=O (O/B), 10=B (O/B)
MV	18	CFG_W3	Set heating output 3 operation		Write	1=None, 2=Off-On
MV	19	CFG_W4	Set heating output 4 operation		Write	1=None, 2=Off-On
MV	23	CFG_FAN	Select fan output		Write	1=BO1, 2=BO2, 3=AO1, 4=AO2, 5=BO1_AO1, 6=BO1_AO2
MV	27	AI_OAT	Select outside air temp. input		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External
MV	28	AI_SAT	Select supply air temp. input		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External
MV	30	AO_ECO	Select economizer output		Write	1=None, 2=BO-5, 3=BO-6, 4=BO-7, 5=AO-1, 6=AO-2, 7=AO-3, 8=AO-4
MV	32	CFG_EXH	Select power exhaust output		Write	1=None, 2=BO-6, 3=BO-7, 4=AO-4, 5=BO-6 & AO-4, 6=BO-7 & AO-4
MV	44	BI_PIR	Select PIR Motion sensor input		Write	1=NO, AI1 (BI), 2=NC, AI1 (BI), 3=NO, AI2 (BI), 4=NC, AI2 (BI), 5=NO, AI3 (BI), 6=NC, AI3 (BI), 7=NO, AI4 (BI), 8=NC, AI4 (BI), 9=External, 10=Intern
MV	45	BI_SCH_Input	Select schedule input		Write	1=None (Off), 2=None (On), 3=Scheduler, 4=AI-1, 5=AI-2, 6=AI-3, 7=AI-4, 8=External
MV	48	BO_HUM	Select humidifier BO output		Write	1=None, 2=BO-2, 3=BO-3, 4=BO-4, 5=BO-5, 6=BO-6, 7=BO-7, 8=BO-5+BO-6 (2stages), 9=BO-6+BO-7 (2stages)
MV	49	AO_HUM	Select humidifier AO output		Write	1=None, 2=AO-1, 3=AO-2, 4=AO-3, 5=AO-4
MV	52	AI_RH	Select room humidity input		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External, 7=Intern
MV	54	AI_SRH	Select supply humidity input		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External
MV	55	AIC_SRH	Set supply humidity input signal		Write	1=0-10V, 2=2-10V
MV	57	OAH_Loc	Outside humidity physical input loc.		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External, 7=Intern
MV	58	MAT_OCC	Mixed air temperature sensor loc.		Write	1=None, 2=AI-1, 3=AI-2, 4=AI-3, 5=AI-4, 6=External
MV	62	CFGSetp	Room setpoint displayed		Write	1=Heat SP, 2=Center, 3=Cool SP
MV	64	CFGUnit	Unit configuration		Write	1=Metric, 2=Imper(ial)
MV	65	BO_OCC	Select occupied output		Write	1=None, 2=BO2, 3=BO3, 4=BO4, 5=BO5, 6=BO6, 7=BO7, 8=AO1, 9=AO2, 10=AO3
MV	66	AI1_CFG	Select predefined AI1 logic		Write	1=None, 2=NSB, 3=OVR, 4=FILTER, 5=SERVICE, 6=FANLOCK
MV	67	AI2_CFG	Select predefined AI2 logic		Write	1=None, 2=NSB, 3=OVR, 4=FILTER, 5=SERVICE, 6=FANLOCK
MV	68	BO_DEHU	Select dehumidification output		Write	1=None, 2=BO-2, 3=BO-3, 4=BO-4, 5=BO-5, 6=BO-6, 7=BO-7
MV	70	PB	CFG Heating/cooling proportional band		Write	1=3F 1.2C, 2=4F 1.7C, 3=5F 2.2C, 4=6F 2.8C, 5=7F 3.3C, 6=8F 3.5C, 7=9F 5.0C, 8=10F 5.6C
MV	75	KeyLock	SCFG Keypad lock level		Write	1=None, 2=Fan, 3=Mode, 4=FanMode, 5=All
MVmin	100	HELP_mess	Help message		Read	1=Normal, 2=Fanlock, 3=Supply Frozen, 4=Service, 5=Filter, 6=Rem NSB Ovr
MV	127	Preset	Select application		Write	1=RT 2STG, 2=RT ECON, 3=HP 2STG, 4=RT IAQ, 5=RT MOD, 6=HP DEH, 7=HUM-DEH, 8=RT 3STG, 9=RT 4STG, 10=HP 3STG

Object ID lookup: Lynxspring BW437-RTU-LX rooftop unit wall controller point IDs by name

AI1AI_1
AI2AI_2
AI3AI_3
AI4AI_4
AI5RoomT
AI6RoomRH
AI7RoomCO2
AO1AO_ECM
AO2AO_2
AO3AO_3
AO4AO_4
BI1Motion
BO1BO_1
BO2BO_2
BO3BO_3
BO4BO_4
BO5BO_5
BO6BO_6
BO7BO_7
AV1RoomTSP
AV6HTG_Dem
AV7CLG_Dem
AV9Eff_T
AV16SATemp
AV19SATFRSP_Set
AV21ECM_min_Set
AV24Fan_MinOn_Time
AV27OvrTime_Set
AV29OATemp
AV31CO2_SP_Set
AV33MinCLSP
AV34MaxHTSP
AV35OccCLSP
AV36OccHTSP
AV37SP_DB_Set
AV38Unoc_CL_Set
AV39Unoc_HT_Set
AV40STBCoolOffset
AV41STBHeatOffset
AV42EffCLSP
AV43EffHTSP
AV50RT_Cal
AV51Eff_RH
AV52HUM_SP
AV53SAH
AV54SAH_HL_Set
AV55DEH_SP
AV56SAT_HL_Set
AV57SAT_CTR_Set
AV58SAT_LL_Set
AV59Eff_SAT
AV60ComprLockout
AV65EconoMin_Pos
AV66EconoMaxCO2Pos
AV67OATheatOutAuth
AV68OATeconOutAuth
AV75OAH
AV76OAE
AV77EnthSP
AV78MatSP
AV79MAT
BV2OVRSTAT
BV3Mot_Det
BV4AutogenDesc
BV5Occ_Sch
BV7Freeze_Status
BV8Free_CL_Status
BV21EnthalpyAuth
MV1CFGSens
MV2AI_RS
MV3MODE
MV4FAN
MV5Eff_Occ
MV6Loc-Occ
MV7CFG_Y1
MV8CFG_Y2
MV9CFG_Y3
MV10CFG_Y4
MV16CFG_W1
MV17CFG_W2
MV18CFG_W3
MV19CFG_W4
MV23CFG_FAN
MV27AI_OAT
MV28AI_SAT
MV30AO_ECO
MV32CFG_EXH
MV44BI_PIR
MV45BI_SCH_Input
MV48BO_HUM
MV49AO_HUM
MV52AI_RH
MV54AI_SRH
MV55AIC_SRH
MV57OAH_Loc
MV58MAT_OCC
MV62CFGSetp
MV64CFGUnit
MV65BO_OCC
MV66AI1_CFG
MV67AI2_CFG
MV68BO_DEHU
MV70PB
MV75KeyLock
MV100HELP_mess
MV127Preset

Integration notes

The guide has no read/write column; access is inferred from its tags (Status = read-only; Cfg, User and Cmd = writable).
Binary and analog output descriptions are generated from the application chosen in MSV 127 (refreshed when BV 4 is on).
MSV 7-10, 16-19, 23, 27, 28, 30, 32, 44, 45, 48, 49, 52, 54, 55, 65 and 68 are for custom applications; set MSV 127 to custom before changing them.
A JP2 jumper selects whether the seventh output is BO 7 or AO 1 (ECM fan).
Temperature units are listed as °F; the guide prints °F and °C ranges and the controller can be set to metric.

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 BW437-RTU-LX rooftop unit wall controller (Onyxx LX) 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 Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX)

How many BACnet points does the Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) have?

This list has 106 BACnet objects: 7 analog inputs, 4 analog outputs, 42 analog values, 1 binary input, 7 binary outputs, 7 binary values, 38 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) BACnet points are writable?

65 of the 106 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 Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX) BACnet documentation?

Lynxspring does not publish it on its own website. This list comes from BW437-RTU-LX Wall Controller Quick Guide, a copy hosted by Cochrane Supply at https://www.cochranesupply.com/media/assets/product/documents/Lynxspring/BW437-RTU-quick-guide.pdf. Ask Lynxspring or its representative for the current revision.

What are the minimum BACnet points to integrate the Lynxspring BW437-RTU-LX rooftop unit wall controller (Onyxx LX)?

Start with MV 3 MODE (System mode (Off/Auto/Cool/Heat)); MV 6 Loc-Occ (Occupancy command); MV 4 FAN (Fan mode (On/Auto)); AV 35 OccCLSP (Occupied cooling setpoint); AV 36 OccHTSP (Occupied heating setpoint); MV 5 Eff_Occ (Effective occupancy mode); AI 5 RoomT (Room temperature); AV 16 SATemp (Supply air temperature); BV 7 Freeze_Status (Freeze condition active); MV 100 HELP_mess (Help/alarm message (fan lock, frozen, filter)).

How do I check these points on the real BW437-RTU-LX rooftop unit wall controller (Onyxx LX)?

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 Lynxspring BACnet points lists

Source: BW437-RTU-LX Wall Controller Quick Guide. Object names, instances and units are reproduced as published; descriptions are our own.