I see no data after connecting the meter. What should I check?

Verify that the optional Modbus RTU communication module is physically installed in the MULTICAL meter. Not all units ship with it by default. Also confirm that the RS-485 A and B wires are not swapped.

What baud rate and parity settings does this template expect?

The template is configured for 19200 baud with even parity (8E1). Make sure the meter's communication settings match. A mismatch will result in no response on the bus.

How are the float32 registers structured?

Each reading occupies two consecutive 16-bit Modbus registers in standard big-endian (ABCD) byte order. The template handles this automatically, so no manual byte-order configuration is required.

Can I connect multiple MULTICAL meters on the same RS-485 bus?

Yes. Assign each meter a unique Modbus slave address and add a separate device in ModbusCloud for each one, all using the same template. Keep the total bus length within RS-485 specifications and add a termination resistor at the last device.

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Free Modbus template: KAMSTRUP MULTICAL 403-603 | ModbusCloud

///KAMSTRUP MULTICAL 403-603

Modbus RTU

KAMSTRUP MULTICAL 403-603

Name: KAMSTRUP MULTICAL 403-603
Brand: Kamstrup
SKU: 2b826534-4f7b-49af-9158-c0966068464a

Kamstrup

Reads energy and flow data from Kamstrup MULTICAL heat meters via Modbus RTU.

Overview

Modbus RTU template for the Kamstrup MULTICAL 403 and MULTICAL 603 heat meters. It reads thermal energy, water flow, supply and return temperatures, differential temperature, and total energy consumed. All values are provided in real time via float32 registers.

Key readings

Actual Power (kW)
Current Water Flow (l/h)
Supply Temperature
Return Temperature
Temperature Differential
Total Energy Consumed (MWh)

Use cases

Monitor real-time heating power and water flow on a centralized cloud dashboard for multiple buildings.
Log total energy consumed per building to generate monthly or annual heating reports for tenants.
Create an alert when the temperature differential drops below a threshold, indicating a potential circulation issue.
Compare supply and return temperatures across multiple MULTICAL meters to identify underperforming heat exchangers.
Track water flow trends over time to detect leaks or abnormal consumption patterns in district heating networks.

Installation

1Connect the RS-485 A and B terminals of the Kamstrup MULTICAL communication module to the corresponding terminals on your ModbusCloud gateway (MCG or MLP series).
2Ensure the Modbus RTU communication module is installed and enabled on the MULTICAL 403 or 603 via the meter's configuration menu.
3Set the meter's Modbus slave address to a unique value on the bus and configure the baud rate to 19200 with even parity.
4In the ModbusCloud platform, add a new device and import the Kamstrup MULTICAL 403-603 template from the template library.
5Enter the configured Modbus slave address in the device settings and verify that live readings appear on the dashboard.

Things to watch for

I see no data after connecting the meter. What should I check?: Verify that the optional Modbus RTU communication module is physically installed in the MULTICAL meter. Not all units ship with it by default. Also confirm that the RS-485 A and B wires are not swapped.
What baud rate and parity settings does this template expect?: The template is configured for 19200 baud with even parity (8E1). Make sure the meter's communication settings match. A mismatch will result in no response on the bus.
How are the float32 registers structured?: Each reading occupies two consecutive 16-bit Modbus registers in standard big-endian (ABCD) byte order. The template handles this automatically, so no manual byte-order configuration is required.
Can I connect multiple MULTICAL meters on the same RS-485 bus?: Yes. Assign each meter a unique Modbus slave address and add a separate device in ModbusCloud for each one, all using the same template. Keep the total bus length within RS-485 specifications and add a termination resistor at the last device.

Registers (6)

6 read / 0 write

Name	Address	Function	Type	Unit	Access
Actual Power	4	FC03	float32	kW	R
Current Water Flow	0	FC03	float32	l/h	R
Temp. Impulsion	6	FC03	float32	°C	R
Temp. Differential	14	FC03	float32	°C	R
Return Temp.	8	FC03	float32	°C	R
Total Energy Consumed	20	FC03	float32	Mwh	R

Working with Modbus in your projects?

ModbusCloud is the hardware-plus-software platform that installers use to monitor, visualise and control Modbus devices from one portal. This template is one of hundreds you can use right away.

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Specifications

Protocol: Modbus RTU
Brand: Kamstrup
Registers: 6
Compatible models: MULTICAL 403MULTICAL 603
Last updated: 17 April 2026

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