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WattsOn-Mark II -M2 power meter (BACnet MS/TP)

Power and energy meter (submeter) · BACnet points list

Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) BACnet points list

Updated 6 November 2026

Short answer

The -M2 version of the WattsOn-Mark II replaces the Modbus/RTU port with native BACnet MS/TP. It exposes 87 read-only Analog Inputs (totals and per-phase power, voltage, current, power factor, angles, energy by quadrant and device info) and 42 writable Analog Values for CT/PT ratios, demand window, relay alarms, locking and energy reset. The instance scheme is not the same as the -E4 BACnet IP version.

This page lists 129 BACnet objects for the Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) — 42 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Elkor’s own free documentation, linked below.

Manufacturer: Elkor
Model: WattsOn-Mark II -M2 power meter (BACnet MS/TP)
Equipment: Power and energy meter (submeter)
Equipment type: Thermostats, sensors & meters
BACnet objects: 129 (42 writable)
Transport: BACnet MS/TP
Firmware: Firmware V10.60, application V1.300 (PICS, November 2015)
Default device instance: 28xxxxx (xxxxx = serial number)
Also known as: WattsOn-Mark II, W2-M2, WattsOn Mk II BACnet MS/TP, Elkor WattsOn BACnet MS/TP
Source document: WattsOn-Mark II BACnet MS/TP (-M2) Addendum · rev. 2015-11 (Revision 1)

Download CSV 129 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

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

BMS integration notes: Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP)

Integration in brief

Set the MAC, baud and device instance, then write the CT and PT ratios (AV 0-15) to match the installation. Read total kW, imported kWh, demand, power factor, average current and voltage.

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
AI 4	kW_Total	Total real power, kW	Read
AI 45	kWh_Import_Ttl	Imported energy total, kWh	Read
AI 43	kWh_Net_Ttl	Net energy total, kWh	Read
AI 42	kW_Demand	Sliding-window kW demand	Read
AI 10	PF_Total	Total power factor	Read
AI 9	Current_Avg	Average current, A	Read
AI 7	Volts_LN_Avg	Average line-to-neutral voltage, V	Read
AI 11	Frequency	Line frequency, Hz	Read

Network setup

Baud 9600-115200, default 76800; no parity, 1 stop bit.
MAC 1-15 on the address switch, or 0-127 set in software with the switch on 'F'; default 1. Switch position 0 is invalid.
Device instance 0-4,194,302, default 28 followed by the serial number; Max Master default 127; device name up to 16 characters.
Settings are changed on the optional display (then Commit) or with Elkor's configuration utility over the expansion bus; a reset applies them.
Segmentation is not supported.

Watch out for

Reset_Energy only acts on 42405 (0xA5A5); Reboot_Device only on 43605 (0xAA55).
An invalid baud, MAC or instance written through the configuration registers stops the MS/TP port at start-up; there is no error check.
Object instances differ from the -E4 BACnet IP model; don't reuse a -E4 mapping.

Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) 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.

129 of 129 shown

Type

Access

Units

Show

Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) BACnet Points List
			Description
AI	1	Uptime	Time since power-up	s	Read
AImin	4	kW_Total		kW	Read
AI	5	kVAR_Total		kvar	Read
AI	6	kVA_Total		kVA	Read
AImin	7	Volts_LN_Avg		V	Read
AI	8	Volts_LL_Avg		V	Read
AImin	9	Current_Avg		A	Read
AImin	10	PF_Total			Read
AImin	11	Frequency		Hz	Read
AI	12	Volts_Angle_Avg		°	Read
AI	13	Quadrant_Total			Read
AI	14	Volts_AN		V	Read
AI	15	Volts_BN		V	Read
AI	16	Volts_CN		V	Read
AI	17	Volts_AB		V	Read
AI	18	Volts_BC		V	Read
AI	20	Volts_AC		V	Read
AI	21	Current_A		A	Read
AI	22	Current_B		A	Read
AI	23	Current_C		A	Read
AI	24	kW_A		kW	Read
AI	25	kW_B		kW	Read
AI	26	kW_C		kW	Read
AI	27	kVAR_A		kvar	Read
AI	28	kVAR_B		kvar	Read
AI	29	kVAR_C		kvar	Read
AI	30	kVA_A		kVA	Read
AI	31	kVA_B		kVA	Read
AI	32	kVA_C		kVA	Read
AI	33	PF_A			Read
AI	34	PF_B			Read
AI	35	PF_C			Read
AI	36	Volts_Angle_AB		°	Read
AI	37	Volts_Angle_BC		°	Read
AI	38	Volts_Angle_AC		°	Read
AI	39	Quadrant_A			Read
AI	40	Quadrant_B			Read
AI	41	Quadrant_C			Read
AImin	42	kW_Demand		kW	Read
AImin	43	kWh_Net_Ttl		kWh	Read
AI	44	kVAh_Net_Ttl		kVAh	Read
AImin	45	kWh_Import_Ttl		kWh	Read
AI	46	kWh_Export_Ttl		kWh	Read
AI	47	kVAh_Import_Ttl		kVAh	Read
AI	48	Q1_VARh_Ttl		kvarh	Read
AI	49	Q2_VARh_Ttl		kvarh	Read
AI	50	Q3_VARh_Ttl		kvarh	Read
AI	51	Q4_VARh_Ttl		kvarh	Read
AI	52	Q1+Q2_VARh_Ttl		kvarh	Read
AI	53	Q3+Q4_VARh_Ttl		kvarh	Read
AI	54	kWh_Net_A		kWh	Read
AI	55	kWh_Net_B		kWh	Read
AI	56	kWh_Net_C		kWh	Read
AI	57	kVA_Net_A		kVAh	Read
AI	58	kVA_Net_B		kVAh	Read
AI	59	kVA_Net_C		kVAh	Read
AI	60	kWh_Import_A		kWh	Read
AI	61	kWh_Import_B		kWh	Read
AI	62	kWh_Import_C		kWh	Read
AI	63	kWh_Export_A		kWh	Read
AI	64	kWh_Export_B		kWh	Read
AI	65	kWh_Export_C		kWh	Read
AI	66	kVA_Import_A		kVAh	Read
AI	67	kVA_Import_B		kVAh	Read
AI	68	kVA_Import_C		kVAh	Read
AI	69	kVA_Export_A		kVAh	Read
AI	70	kVA_Export_B		kVAh	Read
AI	71	kVA_Export_C		kVAh	Read
AI	72	kVARh_Q1_A		kvarh	Read
AI	73	kVARh_Q1_B		kvarh	Read
AI	74	kVARh_Q1_C		kvarh	Read
AI	75	kVARh_Q2_A		kvarh	Read
AI	76	kVARh_Q2_B		kvarh	Read
AI	77	kVARh_Q2_C		kvarh	Read
AI	78	kVARh_Q3_A		kvarh	Read
AI	79	kVARh_Q3_B		kvarh	Read
AI	80	kVARh_Q3_C		kvarh	Read
AI	81	kVARh_Q4_A		kvarh	Read
AI	82	kVARh_Q4_B		kvarh	Read
AI	83	kVARh_Q4_C		kvarh	Read
AV	0	CT_Primary_All	CT primary for all three phases		Write
AV	1	CT_Secondary_All	CT secondary for all three phases		Write
AV	2	CT_Primary_A			Write
AV	3	CT_Secondary_A			Write
AV	4	CT_Primary_B			Write
AV	5	CT_Secondary_B			Write
AV	6	CT_Primary_C			Write
AV	7	CT_Secondary_C			Write
AV	8	PT_Primary_All	PT primary for all three phases		Write
AV	9	PT_Secondary_All	PT secondary for all three phases		Write
AV	10	PT_Primary_A			Write
AV	11	PT_Secondary_A			Write
AV	12	PT_Primary_B			Write
AV	13	PT_Secondary_B			Write
AV	14	PT_Primary_C			Write
AV	15	PT_Secondary_C			Write
AV	16	Phase_Comp_All	Phase compensation, all phases		Write
AV	17	Phase_Comp_A			Write
AV	18	Phase_Comp_B			Write
AV	19	Phase_Comp_C			Write
AV	20	Window_Length	Sliding-window demand sub-interval, s	s	Write
AV	21	Window_Count	Number of sliding-window sub-intervals		Write
AV	22	Window_Sync	Resets the sliding-window demand timer		Write
AV	23	Freq_Auto	Auto-select voltage channel for frequency		Write
AV	24	Freq_Channel	Voltage channel for frequency (0 A, 1 B, 2 C)		Write
AV	25	PF_Sign_Mode	How the power factor sign is calculated		Write
AI	100	Serial_Number	Factory serial number		Read
AI	101	Debug_Register	Always reads 1234.567 (comms check)		Read
AI	102	Hardware_Ver			Read
AI	103	Firmware_Ver			Read
AI	104	Bootloader_Ver			Read
AI	105	Model_Number	Model code; 19762 = M2		Read
AI	106	Input_Config	CT type: 1 mA, 2 mV, 3 5 A, 4 Rogowski, 0 custom		Read
AV	26	K1_Reg_Offset			Write
AV	27	K1_Trigger_Type			Write
AV	28	K1_Upper_Bound			Write
AV	29	K1_Lower_Bound			Write
AV	30	K1_Min_Duration			Write
AV	31	K1_Active_Mode			Write
AV	32	K2_Reg_Offset			Write
AV	33	K2_Trigger_Type			Write
AV	34	K2_Upper_Bound			Write
AV	35	K2_Lower_Bound			Write
AV	36	K2_Min_Duration			Write
AV	37	K2_Active_Mode			Write
AV	38	Passcode	Passcode entry for lock/unlock		Write
AV	39	Lock	Lock state; write 0 unlock, 1 lock, 2 change passcode		Write
AV	40	Reset_Energy	Write 42405 (0xA5A5) to zero the energy totals		Write
AV	41	Reboot_Device	Write 43605 (0xAA55) to reboot; reads 0		Write

Object ID lookup: Elkor WattsOn-Mark II -M2 power meter point IDs by name

AI1Uptime
AI4kW_Total
AI5kVAR_Total
AI6kVA_Total
AI7Volts_LN_Avg
AI8Volts_LL_Avg
AI9Current_Avg
AI10PF_Total
AI11Frequency
AI12Volts_Angle_Avg
AI13Quadrant_Total
AI14Volts_AN
AI15Volts_BN
AI16Volts_CN
AI17Volts_AB
AI18Volts_BC
AI20Volts_AC
AI21Current_A
AI22Current_B
AI23Current_C
AI24kW_A
AI25kW_B
AI26kW_C
AI27kVAR_A
AI28kVAR_B
AI29kVAR_C
AI30kVA_A
AI31kVA_B
AI32kVA_C
AI33PF_A
AI34PF_B
AI35PF_C
AI36Volts_Angle_AB
AI37Volts_Angle_BC
AI38Volts_Angle_AC
AI39Quadrant_A
AI40Quadrant_B
AI41Quadrant_C
AI42kW_Demand
AI43kWh_Net_Ttl
AI44kVAh_Net_Ttl
AI45kWh_Import_Ttl
AI46kWh_Export_Ttl
AI47kVAh_Import_Ttl
AI48Q1_VARh_Ttl
AI49Q2_VARh_Ttl
AI50Q3_VARh_Ttl
AI51Q4_VARh_Ttl
AI52Q1+Q2_VARh_Ttl
AI53Q3+Q4_VARh_Ttl
AI54kWh_Net_A
AI55kWh_Net_B
AI56kWh_Net_C
AI57kVA_Net_A
AI58kVA_Net_B
AI59kVA_Net_C
AI60kWh_Import_A
AI61kWh_Import_B
AI62kWh_Import_C
AI63kWh_Export_A
AI64kWh_Export_B
AI65kWh_Export_C
AI66kVA_Import_A
AI67kVA_Import_B
AI68kVA_Import_C
AI69kVA_Export_A
AI70kVA_Export_B
AI71kVA_Export_C
AI72kVARh_Q1_A
AI73kVARh_Q1_B
AI74kVARh_Q1_C
AI75kVARh_Q2_A
AI76kVARh_Q2_B
AI77kVARh_Q2_C
AI78kVARh_Q3_A
AI79kVARh_Q3_B
AI80kVARh_Q3_C
AI81kVARh_Q4_A
AI82kVARh_Q4_B
AI83kVARh_Q4_C
AV0CT_Primary_All
AV1CT_Secondary_All
AV2CT_Primary_A
AV3CT_Secondary_A
AV4CT_Primary_B
AV5CT_Secondary_B
AV6CT_Primary_C
AV7CT_Secondary_C
AV8PT_Primary_All
AV9PT_Secondary_All
AV10PT_Primary_A
AV11PT_Secondary_A
AV12PT_Primary_B
AV13PT_Secondary_B
AV14PT_Primary_C
AV15PT_Secondary_C
AV16Phase_Comp_All
AV17Phase_Comp_A
AV18Phase_Comp_B
AV19Phase_Comp_C
AV20Window_Length
AV21Window_Count
AV22Window_Sync
AV23Freq_Auto
AV24Freq_Channel
AV25PF_Sign_Mode
AI100Serial_Number
AI101Debug_Register
AI102Hardware_Ver
AI103Firmware_Ver
AI104Bootloader_Ver
AI105Model_Number
AI106Input_Config
AV26K1_Reg_Offset
AV27K1_Trigger_Type
AV28K1_Upper_Bound
AV29K1_Lower_Bound
AV30K1_Min_Duration
AV31K1_Active_Mode
AV32K2_Reg_Offset
AV33K2_Trigger_Type
AV34K2_Upper_Bound
AV35K2_Lower_Bound
AV36K2_Min_Duration
AV37K2_Active_Mode
AV38Passcode
AV39Lock
AV40Reset_Energy
AV41Reboot_Device

Integration notes

AI 19 is not used; Volts_AC is AI 20.
Energy objects are printed with the kWh unit code, but the table says the real units of the kVAh and kVARh objects are kVAh and kVARh; those units are used here.
The unit text for kVAR and kVA is swapped in the table; units here follow the BACnet unit codes (12 = kvar, 9 = kVA).
In this -M2 list all settings (including Lock, Freq_Auto and the relay trigger/mode settings) are Analog Values; the -E4 BACnet IP list uses other types and instances.
Source: WattsOn-Mark II BACnet MS/TP (-M2) Addendum, Revision 1 (November 2015), section 4.

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 WattsOn-Mark II -M2 power meter (BACnet MS/TP) 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 Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP)

How many BACnet points does the Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) have?

This list has 129 BACnet objects: 87 analog inputs, 42 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) BACnet points are writable?

42 of the 129 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 Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP) BACnet documentation?

The source is WattsOn-Mark II BACnet MS/TP (-M2) Addendum, revision 2015-11 (Revision 1), published free by Elkor at https://www.elkor.net/pdfs/W2-BACnet_MSTP_Guide.pdf.

What are the minimum BACnet points to integrate the Elkor WattsOn-Mark II -M2 power meter (BACnet MS/TP)?

Start with AI 4 kW_Total (Total real power, kW); AI 45 kWh_Import_Ttl (Imported energy total, kWh); AI 43 kWh_Net_Ttl (Net energy total, kWh); AI 42 kW_Demand (Sliding-window kW demand); AI 10 PF_Total (Total power factor); AI 9 Current_Avg (Average current, A); AI 7 Volts_LN_Avg (Average line-to-neutral voltage, V); AI 11 Frequency (Line frequency, Hz).

How do I check these points on the real WattsOn-Mark II -M2 power meter (BACnet MS/TP)?

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 Elkor BACnet points lists

Source: WattsOn-Mark II BACnet MS/TP (-M2) Addendum · rev. 2015-11 (Revision 1). Object names, instances and units are reproduced as published; descriptions are our own.