Can I use the Modbus RTU port on the Webasto Unite to communicate with the gateway?

No. The Modbus RTU port on the Webasto Unite is intended exclusively for connecting external energy counters. All wallbox monitoring and control must use Modbus TCP over the Ethernet connection.

What data types are used for the energy and power registers?

The Energy Meter, Total Charge Active Power, and Set Charge Power registers are all uint32. Power values are expressed in kW. Make sure your gateway and template configuration use the correct data type to avoid misread values.

The gateway cannot reach the wallbox over Modbus TCP. What should I check?

Confirm that the wallbox is connected to the network and that Modbus TCP is enabled in its settings. Verify the IP address and ensure port 502 is not blocked by a firewall or VLAN segmentation.

How do I adjust the charging power remotely?

Use the Set Charge Power writable register exposed by this template. You can change the value from the ModbusCloud dashboard or through an automation rule to implement scheduled or dynamic load management.

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Free Modbus template: Webasto Unite 11kW | ModbusCloud

///Webasto Unite 11kW

Modbus TCP

Webasto Unite 11kW

Name: Webasto Unite 11kW
Brand: Webasto
SKU: a69ad957-ed67-4a22-85bb-aeee81d1c24a

Webasto

Controls and monitors Webasto Unite 11kW wallbox charging via Modbus TCP.

Overview

Template for the Webasto Unite 11kW wallbox via Modbus TCP. It reads charge point state, cable state, active power, and energy meter values. It also allows setting the charge power setpoint through a writable register.

Key readings

Charge Point State
Charge State
Cable State
Total Charge Active Power
Energy Meter

Available commands

Set Charge Power

Use cases

Monitor real-time charging power and cumulative energy consumption for each Webasto Unite wallbox on a cloud dashboard.
Set charge power setpoints remotely to implement dynamic load management across multiple EV chargers.
Create alerts when the cable state or charge point state changes unexpectedly, indicating a potential fault.
Track total energy delivered per charger to generate usage reports for tenants or fleet operators.
Verify charger availability and uptime across multiple customer sites from a single ModbusCloud account.

Installation

1Connect the Webasto Unite 11kW to the local network via Ethernet and verify that Modbus TCP is enabled in the wallbox configuration menu.
2Install the ModbusCloud gateway (MCG or MLP series) on the same local network as the wallbox and confirm connectivity.
3Note the IP address of the Webasto Unite and ensure port 502 (default Modbus TCP port) is reachable from the gateway.
4Import the Webasto Unite 11kW template from the ModbusCloud template library and assign the correct IP address of the wallbox.
5Do not connect the Modbus RTU port for wallbox communication, as it is reserved for external energy counters only.
6Verify that register values such as Charge Point State and Energy Meter appear correctly on the ModbusCloud dashboard after the first poll cycle.

Things to watch for

Can I use the Modbus RTU port on the Webasto Unite to communicate with the gateway?: No. The Modbus RTU port on the Webasto Unite is intended exclusively for connecting external energy counters. All wallbox monitoring and control must use Modbus TCP over the Ethernet connection.
What data types are used for the energy and power registers?: The Energy Meter, Total Charge Active Power, and Set Charge Power registers are all uint32. Power values are expressed in kW. Make sure your gateway and template configuration use the correct data type to avoid misread values.
The gateway cannot reach the wallbox over Modbus TCP. What should I check?: Confirm that the wallbox is connected to the network and that Modbus TCP is enabled in its settings. Verify the IP address and ensure port 502 is not blocked by a firewall or VLAN segmentation.
How do I adjust the charging power remotely?: Use the Set Charge Power writable register exposed by this template. You can change the value from the ModbusCloud dashboard or through an automation rule to implement scheduled or dynamic load management.

Registers (6)

5 read / 1 write

Name	Address	Function	Type	Unit	Access
Cable State	1004	FC04	uint16		R
Energy Meter	1036	FC04	uint32		R
Charge State	1001	FC04	uint16		R
Total Charge Active Power	1020	FC04	uint32	kW	R
Charge Point State	1000	FC04	uint16		R
Set Charge Power	5004	FC16	uint32	kW	W

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 TCP
Brand: Webasto
Registers: 6
Compatible models: Webasto Unite 11kW
Last updated: 17 April 2026

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