Iskra WM3M4

Name: Iskra WM3M4
Brand: Iskra
SKU: d1874e02-8d54-47ca-85a3-346008ac8b9b

MID energy meter for charging stations with energy counters and signed charging sessions.

The Iskra WM3M4 is a MID certified three phase energy meter for EV charging stations, and the WM3M4C version also signs each charging session. This Modbus RTU template reads voltage, current, power, energy counters and charging session values in ModbusCloud, and lets you change communication, display and clock settings.

Protocol: Modbus RTU
Connection: RS485, 115200 baud
Registers: 1088, read and write

Brand: Iskra
Key readings: Voltage per phase · Current per phase · Active power · Energy counters · Charging session energy · Signature status
Available commands: Modbus address and baud rate · Display settings · Charging session commands · Clock and time zone
Compatible models: WM3M4 · WM3M4C (with digital signature)
Last updated: 19 October 2026

Registers (1088)

1079 read, 50 write

Name	Unit	Access
Device Group		Read
Model Number		Read
Serial Number		Read
Software Reference		Read
Hardware Reference		Read
Calibration Voltage	mV	Read
Calibration Current	mA	Read
Accuracy Class		Read
COM1 Communication Type		Read
Calibration Time Stamp		Read
MID Lock Status		Read
MID Unlock Counter		Read
FW Upgrade Counter		Read
Software CheckSum HI		Read
Phase Module 1 Software Reference		Read
Phase Module 2 Software Reference		Read
Phase Module 3 Software Reference		Read
Phase Module 1 CheckSum		Read
Phase Module 2 CheckSum		Read
Phase Module 3 CheckSum		Read
Phase Module 1 Calibration CheckSum		Read
Phase Module 2 Calibration CheckSum		Read
Phase Module 3 Calibration CheckSum		Read
CheckSum Params		Read
CheckSum Main Firmware		Read
Active Communication Port		Read
Modbus Max Registers per Read		Read
Phase Valid Measurement		Read
Frequency	Hz	Read
Voltage U1	V	Read
Voltage U2	V	Read
Voltage U3	V	Read
Voltage Uavg LN	V	Read
Angle U1 U2	°	Read
Angle U2 U3	°	Read
Angle U3 U1	°	Read
Voltage U12	V	Read
Voltage U23	V	Read
Voltage U31	V	Read
Voltage Uavg LL	V	Read
Current I1	A	Read
Current I2	A	Read
Current I3	A	Read
Neutral Current Inc	A	Read
Neutral Current Inm	A	Read
Current Iavg	A	Read
Current Sum	A	Read
Active Power Total	W	Read
Active Power L1	W	Read
Active Power L2	W	Read
Active Power L3	W	Read
Reactive Power Total	var	Read
Reactive Power L1	var	Read
Reactive Power L2	var	Read
Reactive Power L3	var	Read
Apparent Power Total	VA	Read
Apparent Power L1	VA	Read
Apparent Power L2	VA	Read
Apparent Power L3	VA	Read
Power Factor Total		Read
Power Factor L1		Read
Power Factor L2		Read
Power Factor L3		Read
Power Angle Total	°	Read
Power Angle L1	°	Read
Power Angle L2	°	Read
Power Angle L3	°	Read
Internal Temperature	°C	Read
THD U1	%	Read
THD U2	%	Read
THD U3	%	Read
THD U12	%	Read
THD U23	%	Read
THD U31	%	Read
THD I1	%	Read
THD I2	%	Read
THD I3	%	Read
CheckSum Status		Read
Current Active Tariff		Read
Energy Counter 1 Exponent		Read
Energy Counter 2 Exponent		Read
Energy Counter 3 Exponent		Read
Energy Counter 4 Exponent		Read
Energy Counter 1		Read
Energy Counter 2		Read
Energy Counter 3		Read
Energy Counter 4		Read
Energy Counter 1 x1000		Read
Energy Counter 2 x1000		Read
Energy Counter 3 x1000		Read
Energy Counter 4 x1000		Read
Run Time		Read
Average Interval Duration	s	Read
Time Since Last Average	s	Read
Average Measurements Counter		Read
Average Timestamp Run Time		Read
Average Frequency	Hz	Read
Average Voltage U1	V	Read
Average Voltage U2	V	Read
Average Voltage U3	V	Read
Average Voltage Uavg LN	V	Read
Average Angle U1 U2	°	Read
Average Angle U2 U3	°	Read
Average Angle U3 U1	°	Read
Average Voltage U12	V	Read
Average Voltage U23	V	Read
Average Voltage U31	V	Read
Average Voltage Uavg LL	V	Read
Average Current I1	A	Read
Average Current I2	A	Read
Average Current I3	A	Read
Average Neutral Current Inc	A	Read
Average Neutral Current Inm	A	Read
Average Current Iavg	A	Read
Average Current Sum	A	Read
Average Active Power Total	W	Read
Average Active Power L1	W	Read
Average Active Power L2	W	Read
Average Active Power L3	W	Read
Average Reactive Power Total	var	Read
Average Reactive Power L1	var	Read
Average Reactive Power L2	var	Read
Average Reactive Power L3	var	Read
Average Apparent Power Total	VA	Read
Average Apparent Power L1	VA	Read
Average Apparent Power L2	VA	Read
Average Apparent Power L3	VA	Read
Average Power Factor Total		Read
Average Power Factor L1		Read
Average Power Factor L2		Read
Average Power Factor L3		Read
Average Power Angle Total	°	Read
Average Power Angle L1	°	Read
Average Power Angle L2	°	Read
Average Power Angle L3	°	Read
Average Internal Temperature	°C	Read
Average THD U1	%	Read
Average THD U2	%	Read
Average THD U3	%	Read
Average THD U12	%	Read
Average THD U23	%	Read
Average THD U31	%	Read
Average THD I1	%	Read
Average THD I2	%	Read
Average THD I3	%	Read
Max Frequency	Hz	Read
Max Voltage U1	V	Read
Max Voltage U2	V	Read
Max Voltage U3	V	Read
Max Voltage Uavg LN	V	Read
Max Angle U1 U2	°	Read
Max Angle U2 U3	°	Read
Max Angle U3 U1	°	Read
Max Voltage U12	V	Read
Max Voltage U23	V	Read
Max Voltage U31	V	Read
Max Voltage Uavg LL	V	Read
Max Current I1	A	Read
Max Current I2	A	Read
Max Current I3	A	Read
Max Neutral Current Inc	A	Read
Max Neutral Current Inm	A	Read
Max Current Iavg	A	Read
Max Current Sum	A	Read
Max Active Power Total	W	Read
Max Active Power L1	W	Read
Max Active Power L2	W	Read
Max Active Power L3	W	Read
Max Reactive Power Total	var	Read
Max Reactive Power L1	var	Read
Max Reactive Power L2	var	Read
Max Reactive Power L3	var	Read
Max Apparent Power Total	VA	Read
Max Apparent Power L1	VA	Read
Max Apparent Power L2	VA	Read
Max Apparent Power L3	VA	Read
Max Power Factor Total		Read
Max Power Factor L1		Read
Max Power Factor L2		Read
Max Power Factor L3		Read
Max Power Angle Total	°	Read
Max Power Angle L1	°	Read
Max Power Angle L2	°	Read
Max Power Angle L3	°	Read
Max Internal Temperature	°C	Read
Max THD U1	%	Read
Max THD U2	%	Read
Max THD U3	%	Read
Max THD U12	%	Read
Max THD U23	%	Read
Max THD U31	%	Read
Max THD I1	%	Read
Max THD I2	%	Read
Max THD I3	%	Read
Min Frequency	Hz	Read
Min Voltage U1	V	Read
Min Voltage U2	V	Read
Min Voltage U3	V	Read
Min Voltage Uavg LN	V	Read
Min Angle U1 U2	°	Read
Min Angle U2 U3	°	Read
Min Angle U3 U1	°	Read
Min Voltage U12	V	Read
Min Voltage U23	V	Read
Min Voltage U31	V	Read
Min Voltage Uavg LL	V	Read
Min Current I1	A	Read
Min Current I2	A	Read
Min Current I3	A	Read
Min Neutral Current Inc	A	Read
Min Neutral Current Inm	A	Read
Min Current Iavg	A	Read
Min Current Sum	A	Read
Min Active Power Total	W	Read
Min Active Power L1	W	Read
Min Active Power L2	W	Read
Min Active Power L3	W	Read
Min Reactive Power Total	var	Read
Min Reactive Power L1	var	Read
Min Reactive Power L2	var	Read
Min Reactive Power L3	var	Read
Min Apparent Power Total	VA	Read
Min Apparent Power L1	VA	Read
Min Apparent Power L2	VA	Read
Min Apparent Power L3	VA	Read
Min Power Factor Total		Read
Min Power Factor L1		Read
Min Power Factor L2		Read
Min Power Factor L3		Read
Min Power Angle Total	°	Read
Min Power Angle L1	°	Read
Min Power Angle L2	°	Read
Min Power Angle L3	°	Read
Min Internal Temperature	°C	Read
Min THD U1	%	Read
Min THD U2	%	Read
Min THD U3	%	Read
Min THD U12	%	Read
Min THD U23	%	Read
Min THD U31	%	Read
Min THD I1	%	Read
Min THD I2	%	Read
Min THD I3	%	Read
Logger Measurement Parameter		Read
Logger Time Interval	min	Read
Logger Valid Results		Read
Logger Last Result Time	min	Read
Logger Value 001	%	Read
Logger Value 002	%	Read
Logger Value 003	%	Read
Logger Value 004	%	Read
Logger Value 005	%	Read
Logger Value 006	%	Read
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User Password		Write
Level 1 User Password		Write
Level 2 User Password		Write
Active Access Level		Read and write
Manual Password Activation		Write
Operator Command		Write
Reset Command 1		Write
Digital Output State		Read and write
Description		Read and write
Location		Read and write
LCD Cycling Period	s	Read and write
Operation Mode		Read and write
Modbus Address		Read and write
Baud Rate		Read and write
Stop Bits		Read and write
Parity		Read and write
Data Bits		Read and write
Active Tariff Setting		Read
Common Energy Counter Exponent		Read
Total Energy Calculation		Read
Energy Counter 1 Parameter		Read
Energy Counter 1 Configuration		Read
Energy Counter 1 Divider		Read
Energy Counter 1 Tariff Selector		Read
Energy Counter 2 Parameter		Read
Energy Counter 2 Configuration		Read
Energy Counter 2 Divider		Read
Energy Counter 2 Tariff Selector		Read
Energy Counter 3 Parameter		Read
Energy Counter 3 Configuration		Read
Energy Counter 3 Divider		Read
Energy Counter 3 Tariff Selector		Read
Energy Counter 4 Parameter		Read
Energy Counter 4 Configuration		Read
Energy Counter 4 Divider		Read
Energy Counter 4 Tariff Selector		Read
Pulse LED Number of Pulses		Read
Pulse LED Energy Unit		Read
Pulse LED Pulse Length	ms	Read
Auto Freeze Interval	min	Read and write
Time to Freeze	s	Read and write
Time from Freeze	s	Read
Freeze Status		Read and write
Snapshot Active Tariff		Read
Snapshot Energy Counter 1		Read
Snapshot Energy Counter 2		Read
Snapshot Energy Counter 1 x1000		Read
Snapshot Energy Counter 2 x1000		Read
Interval Duration	s	Read and write
Time to Calculate Interval	s	Read and write
Cable Resistance Log Size		Read
Cable Resistance Log Used		Read
Cable Resistance Log 1 Timestamp		Read
Cable Resistance Log 1 New Value		Read
Cable Resistance Log 1 Old Value		Read
Cable Resistance Log 2 Timestamp		Read
Cable Resistance Log 2 New Value		Read
Cable Resistance Log 2 Old Value		Read
Cable Resistance Log 3 Timestamp		Read
Cable Resistance Log 3 New Value		Read
Cable Resistance Log 3 Old Value		Read
Cable Resistance Log 4 Timestamp		Read
Cable Resistance Log 4 New Value		Read
Cable Resistance Log 4 Old Value		Read
Cable Resistance Log 5 Timestamp		Read
Cable Resistance Log 5 New Value		Read
Cable Resistance Log 5 Old Value		Read
Cable Resistance Log 6 Timestamp		Read
Cable Resistance Log 6 New Value		Read
Cable Resistance Log 6 Old Value		Read
Cable Resistance Log 7 Timestamp		Read
Cable Resistance Log 7 New Value		Read
Cable Resistance Log 7 Old Value		Read
Cable Resistance Log 8 Timestamp		Read
Cable Resistance Log 8 New Value		Read
Cable Resistance Log 8 Old Value		Read
Cable Resistance Log 9 Timestamp		Read
Cable Resistance Log 9 New Value		Read
Cable Resistance Log 9 Old Value		Read
Cable Resistance Log 10 Timestamp		Read
Cable Resistance Log 10 New Value		Read
Cable Resistance Log 10 Old Value		Read
Cable Resistance Log 11 Timestamp		Read
Cable Resistance Log 11 New Value		Read
Cable Resistance Log 11 Old Value		Read
Cable Resistance Log 12 Timestamp		Read
Cable Resistance Log 12 New Value		Read
Cable Resistance Log 12 Old Value		Read
Cable Resistance Log 13 Timestamp		Read
Cable Resistance Log 13 New Value		Read
Cable Resistance Log 13 Old Value		Read
Cable Resistance Log 14 Timestamp		Read
Cable Resistance Log 14 New Value		Read
Cable Resistance Log 14 Old Value		Read
Cable Resistance Log 15 Timestamp		Read
Cable Resistance Log 15 New Value		Read
Cable Resistance Log 15 Old Value		Read
Cable Resistance Log 16 Timestamp		Read
Cable Resistance Log 16 New Value		Read
Cable Resistance Log 16 Old Value		Read
Cable Resistance Log 17 Timestamp		Read
Cable Resistance Log 17 New Value		Read
Cable Resistance Log 17 Old Value		Read
Cable Resistance Log 18 Timestamp		Read
Cable Resistance Log 18 New Value		Read
Cable Resistance Log 18 Old Value		Read
Cable Resistance Log 19 Timestamp		Read
Cable Resistance Log 19 New Value		Read
Cable Resistance Log 19 Old Value		Read
Cable Resistance Log 20 Timestamp		Read
Cable Resistance Log 20 New Value		Read
Cable Resistance Log 20 Old Value		Read
Cable Resistance Log 21 Timestamp		Read
Cable Resistance Log 21 New Value		Read
Cable Resistance Log 21 Old Value		Read
Cable Resistance Log 22 Timestamp		Read
Cable Resistance Log 22 New Value		Read
Cable Resistance Log 22 Old Value		Read
Cable Resistance Log 23 Timestamp		Read
Cable Resistance Log 23 New Value		Read
Cable Resistance Log 23 Old Value		Read
Cable Resistance Log 24 Timestamp		Read
Cable Resistance Log 24 New Value		Read
Cable Resistance Log 24 Old Value		Read
Cable Resistance Log 25 Timestamp		Read
Cable Resistance Log 25 New Value		Read
Cable Resistance Log 25 Old Value		Read
Cable Resistance Log 26 Timestamp		Read
Cable Resistance Log 26 New Value		Read
Cable Resistance Log 26 Old Value		Read
Cable Resistance Log 27 Timestamp		Read
Cable Resistance Log 27 New Value		Read
Cable Resistance Log 27 Old Value		Read
Cable Resistance Log 28 Timestamp		Read
Cable Resistance Log 28 New Value		Read
Cable Resistance Log 28 Old Value		Read
Cable Resistance Log 29 Timestamp		Read
Cable Resistance Log 29 New Value		Read
Cable Resistance Log 29 Old Value		Read
Cable Resistance Log 30 Timestamp		Read
Cable Resistance Log 30 New Value		Read
Cable Resistance Log 30 Old Value		Read
Cable Resistance Log 31 Timestamp		Read
Cable Resistance Log 31 New Value		Read
Cable Resistance Log 31 Old Value		Read
Cable Resistance Log 32 Timestamp		Read
Cable Resistance Log 32 New Value		Read
Cable Resistance Log 32 Old Value		Read
Cable Loss Config Log Size		Read
Cable Loss Config Log Used		Read
Cable Loss Config Log 1 Timestamp		Read
Cable Loss Config Log 1 New Value		Read
Cable Loss Config Log 1 Old Value		Read
Cable Loss Config Log 2 Timestamp		Read
Cable Loss Config Log 2 New Value		Read
Cable Loss Config Log 2 Old Value		Read
Cable Loss Config Log 3 Timestamp		Read
Cable Loss Config Log 3 New Value		Read
Cable Loss Config Log 3 Old Value		Read
Cable Loss Config Log 4 Timestamp		Read
Cable Loss Config Log 4 New Value		Read
Cable Loss Config Log 4 Old Value		Read
Cable Loss Config Log 5 Timestamp		Read
Cable Loss Config Log 5 New Value		Read
Cable Loss Config Log 5 Old Value		Read
Cable Loss Config Log 6 Timestamp		Read
Cable Loss Config Log 6 New Value		Read
Cable Loss Config Log 6 Old Value		Read
Cable Loss Config Log 7 Timestamp		Read
Cable Loss Config Log 7 New Value		Read
Cable Loss Config Log 7 Old Value		Read
Cable Loss Config Log 8 Timestamp		Read
Cable Loss Config Log 8 New Value		Read
Cable Loss Config Log 8 Old Value		Read
Cable Loss Config Log 9 Timestamp		Read
Cable Loss Config Log 9 New Value		Read
Cable Loss Config Log 9 Old Value		Read
Cable Loss Config Log 10 Timestamp		Read
Cable Loss Config Log 10 New Value		Read
Cable Loss Config Log 10 Old Value		Read
Cable Loss Config Log 11 Timestamp		Read
Cable Loss Config Log 11 New Value		Read
Cable Loss Config Log 11 Old Value		Read
Cable Loss Config Log 12 Timestamp		Read
Cable Loss Config Log 12 New Value		Read
Cable Loss Config Log 12 Old Value		Read
Cable Loss Config Log 13 Timestamp		Read
Cable Loss Config Log 13 New Value		Read
Cable Loss Config Log 13 Old Value		Read
Cable Loss Config Log 14 Timestamp		Read
Cable Loss Config Log 14 New Value		Read
Cable Loss Config Log 14 Old Value		Read
Cable Loss Config Log 15 Timestamp		Read
Cable Loss Config Log 15 New Value		Read
Cable Loss Config Log 15 Old Value		Read
Cable Loss Config Log 16 Timestamp		Read
Cable Loss Config Log 16 New Value		Read
Cable Loss Config Log 16 Old Value		Read
Cable Loss Config Log 17 Timestamp		Read
Cable Loss Config Log 17 New Value		Read
Cable Loss Config Log 17 Old Value		Read
Cable Loss Config Log 18 Timestamp		Read
Cable Loss Config Log 18 New Value		Read
Cable Loss Config Log 18 Old Value		Read
Cable Loss Config Log 19 Timestamp		Read
Cable Loss Config Log 19 New Value		Read
Cable Loss Config Log 19 Old Value		Read
Cable Loss Config Log 20 Timestamp		Read
Cable Loss Config Log 20 New Value		Read
Cable Loss Config Log 20 Old Value		Read
Cable Loss Config Log 21 Timestamp		Read
Cable Loss Config Log 21 New Value		Read
Cable Loss Config Log 21 Old Value		Read
Cable Loss Config Log 22 Timestamp		Read
Cable Loss Config Log 22 New Value		Read
Cable Loss Config Log 22 Old Value		Read
Cable Loss Config Log 23 Timestamp		Read
Cable Loss Config Log 23 New Value		Read
Cable Loss Config Log 23 Old Value		Read
Cable Loss Config Log 24 Timestamp		Read
Cable Loss Config Log 24 New Value		Read
Cable Loss Config Log 24 Old Value		Read
Cable Loss Config Log 25 Timestamp		Read
Cable Loss Config Log 25 New Value		Read
Cable Loss Config Log 25 Old Value		Read
Cable Loss Config Log 26 Timestamp		Read
Cable Loss Config Log 26 New Value		Read
Cable Loss Config Log 26 Old Value		Read
Cable Loss Config Log 27 Timestamp		Read
Cable Loss Config Log 27 New Value		Read
Cable Loss Config Log 27 Old Value		Read
Cable Loss Config Log 28 Timestamp		Read
Cable Loss Config Log 28 New Value		Read
Cable Loss Config Log 28 Old Value		Read
Cable Loss Config Log 29 Timestamp		Read
Cable Loss Config Log 29 New Value		Read
Cable Loss Config Log 29 Old Value		Read
Cable Loss Config Log 30 Timestamp		Read
Cable Loss Config Log 30 New Value		Read
Cable Loss Config Log 30 Old Value		Read
Cable Loss Config Log 31 Timestamp		Read
Cable Loss Config Log 31 New Value		Read
Cable Loss Config Log 31 Old Value		Read
Cable Loss Config Log 32 Timestamp		Read
Cable Loss Config Log 32 New Value		Read
Cable Loss Config Log 32 Old Value		Read
Start Counter 4 Squared Current		Read
Stop Counter 4 Squared Current		Read
Consumption 4 Squared Current		Read
Cable Loss Export	Wh	Read
Consumption Export Plus Cable Loss	Wh	Read
Start Counter 3 Squared Current		Read
Stop Counter 3 Squared Current		Read
Consumption 3 Squared Current		Read
Cable Loss Import	Wh	Read
Consumption Import Minus Cable Loss	Wh	Read
Cable Resistance During Charging		Read
Measurement Status		Read
Transaction Duration	s	Read
Transaction Consumption	Wh	Read
Transaction Active Power Total	W	Read
Transaction Date and Time		Read
Tariff Changes Count		Read
Intermediate Readings Count		Read
Fiscal Readings Count		Read
Signatures Count		Read
Start Timestamp		Read
Start Counter Value	Wh	Read
Stop Timestamp		Read
Stop Counter Value	Wh	Read
Tariff Change Timestamp		Read
Tariff Change Counter Value	Wh	Read
Intermediate Reading Timestamp		Read
Intermediate Reading Counter Value	Wh	Read
Fiscal Reading Timestamp		Read
Fiscal Reading Counter Value	Wh	Read
Hold Measurements Timestamp		Read
Hold Measurements Counter Value	Wh	Read
Suspend Timestamp		Read
Suspend Counter Value	Wh	Read
Start Counter 2 Value	Wh	Read
Stop Counter 2 Value	Wh	Read
Consumption 2	Wh	Read
Power Up Count		Read
Command Register		Write
Signature Status		Read
UTC Time Offset	min	Read and write
Set Date and Time		Write
Input Message Length		Read and write
Output Message Length		Read
Signature Length		Read
Signature Format		Read and write
Signature Algorithm		Read
Backlight		Read and write
LCD Parameters		Read and write
LCD Custom String		Read and write
LCD Custom Label		Read and write
OCMF Format Version		Read
Transaction Reset Command		Read and write
Synchronisation Status		Read and write
Synchronisation Timeout	min	Read and write
UTC Time Use		Read and write
Time Adjustment	s	Read and write
Display MID Info Screen	s	Write
TX Value in End Block		Read and write
Output Message Options		Read and write
Output Message Config		Read and write
Cable Loss Energy Config		Read and write
Cable Resistance		Read and write
OBIS Control		Read
Change Lock Control		Read and write
Change Setting Control		Read and write
Energy Counters Resolution		Read and write
Input Message Part 1		Read and write
Input Message Part 2		Read and write
Input Message Part 3		Read and write
Input Message Part 4		Read and write
Input Message Part 5		Read and write
Output Message Part 1		Read
Output Message Part 2		Read
Output Message Part 3		Read
Output Message Part 4		Read
Output Message Part 5		Read
Public Key		Read
Signature Raw		Read
Signature ASN1 Part 1		Read
Signature ASN1 Part 2		Read
Binary Output Message Length		Read
Binary Output Message		Read

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Send your device list

If a device is not in the library yet, we build the template for free as soon as we have the register data.

Use cases

Read the energy counters of every charging point and use them for monthly billing per car park or tenant.
Watch current per phase to see whether chargers load the phases evenly and stay within the connection capacity.
Follow charging session energy and duration over a year of history per charging point.
Get an alert when the signature status reports an error on a WM3M4C.
Compare voltage per phase across charging points to find a weak supply cable.

Installation

Connect terminals A (16) and B (15) to the RS485 port of the ModbusCloud Gateway, with termination at both ends of the bus.
Give each meter its own Modbus address, since all meters leave the factory with address 33.
Add a Modbus device in ModbusCloud with 115200 baud, no parity and 1 stop bit, or the values you set, and import this template.
Check that voltage, current and the energy counters come in before you add charging points to a dashboard.
After changing a setting, write 1 to the operator command so the meter keeps it after a power cut.

Things to watch for

No meter answers on the bus. What should I check?

The factory address is 33 on every meter, so two new meters on one bus collide. Connect them one at a time, give each a unique address and check the baud rate, which is 115200 from the factory. Also check the A and B wires on terminals 16 and 15.

My changed setting is gone after a restart. Why?

The meter only stores settings permanently after the save command: write 1 to the operator command register. Without it, the old settings return at the next power up.

Voltages and powers show very large numbers. How do I read them?

The meter sends these values with the decimal exponent packed into the same word, so the raw number is not the value in volts or watts. Use the energy counters for billing, and treat the raw measurements as a trend until you convert them with the meter's own formula.

Why can I not change the cable resistance or display settings?

Several WM3M4C settings, such as cable resistance, cable loss and the display selection, can be written only once and are locked after that. Cable resistance can also only be written when no charging session is active.

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