The gateway cannot communicate with the E2618. What should I check?

Verify that the RS-485 wiring is correct (A to A, B to B) and that termination resistors are placed at both ends of the bus if the cable run exceeds a few meters. Confirm the baud rate is set to 9600 with 8 data bits, no parity, and 1 stop bit.

Can I change the slave ID without physically accessing the sensor?

Yes. The slave ID is stored in register address 4 and is writable. You can change it from the ModbusCloud platform, but make sure you update the template configuration to match the new address immediately afterwards.

What does the sensor status register indicate?

The sensor status register reports the operational state of the CO sensing element. A non-zero or unexpected value typically signals a fault condition such as element degradation. Consult the Evikon E2618 datasheet for the specific status codes.

How many E2618 sensors can I connect to one gateway?

You can connect multiple sensors on a single RS-485 bus, each with a unique slave ID. Practical limits depend on cable length and electrical loading, but Modbus RTU supports up to 247 devices on one bus.

How it works Pricing

Try the demo Shop

Dutch company. EU-hosted. GDPR-compliant.

Product

Gateway
Shop
Diagnostics
How it works
Pricing
Try the demo

Company

About us
Knowledge Base
Templates
Contact

Legal

Privacy policy
Terms and conditions
Data Processing Agreement
Cookies
Impressum

Free Modbus template: Evikon E2618 CO | ModbusCloud

///Evikon E2618 CO

Modbus RTU

Evikon E2618 CO

Name: Evikon E2618 CO
Brand: Evikon
SKU: b7d99e72-43be-4f9c-811c-82827b0a38f4

Evikon

Monitors CO gas concentration and temperature for garage ventilation control

Overview

Modbus RTU template for the Evikon E2618 CO sensor. Reads carbon monoxide concentration in ppm and ambient temperature. Also exposes sensor status, hardware version, serial number, and output units.

Key readings

Gas concentration (ppm)
Temperature
Sensor status
Hardware version
Serial number
Output units code

Available commands

Slave ID

Restarts counter

Use cases

Monitor CO concentration in an underground parking garage and display live values on a cloud dashboard.
Create an alert when CO levels exceed a defined ppm threshold for more than five minutes.
Log temperature and CO readings over time to generate compliance reports for building inspections.
Remotely verify sensor status and hardware version to plan preventive maintenance visits.
Track the restarts counter to detect unexpected power cycles or communication issues on the RS-485 bus.

Installation

1Wire the Evikon E2618 sensor to the RS-485 terminals (A, B, GND) of the ModbusCloud gateway (MCG or MLP series).
2Set the sensor baud rate to 9600, 8N1, which is the factory default for the E2618.
3Assign a unique Modbus slave ID to each E2618 on the bus by writing to register address 4, or use the default address if only one sensor is connected.
4Power on the gateway and import the Evikon E2618 CO template from the ModbusCloud template library.
5Configure the slave ID in the template to match the address set on the physical sensor.
6Verify that CO concentration and temperature values appear on the ModbusCloud dashboard before closing the enclosure.

Things to watch for

The gateway cannot communicate with the E2618. What should I check?: Verify that the RS-485 wiring is correct (A to A, B to B) and that termination resistors are placed at both ends of the bus if the cable run exceeds a few meters. Confirm the baud rate is set to 9600 with 8 data bits, no parity, and 1 stop bit.
Can I change the slave ID without physically accessing the sensor?: Yes. The slave ID is stored in register address 4 and is writable. You can change it from the ModbusCloud platform, but make sure you update the template configuration to match the new address immediately afterwards.
What does the sensor status register indicate?: The sensor status register reports the operational state of the CO sensing element. A non-zero or unexpected value typically signals a fault condition such as element degradation. Consult the Evikon E2618 datasheet for the specific status codes.
How many E2618 sensors can I connect to one gateway?: You can connect multiple sensors on a single RS-485 bus, each with a unique slave ID. Practical limits depend on cable length and electrical loading, but Modbus RTU supports up to 247 devices on one bus.

Registers (8)

7 read / 2 write

Name	Address	Function	Type	Unit	Access
HW_ver	1	FC03	uint16		R
Gas concentration	259	FC03	uint16	ppm	R
Slave ID	4	FC03	uint16		R/W
Serial number	3	FC03	uint16		R
Sensor status	255	FC03	uint16		R
Temperature	258	FC03	uint16	°C	R
Output units code	152	FC03	uint16		R
Restarts counter	17	FC06	uint16	count	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.

See the live demo How it works

More RTU templates

Alnor HRU-P

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls Alnor HRU-P heat recovery ventilation units via Modbus RTU.

49 registers7

Alnor HRU

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTU

Controls and monitors Alnor heat recovery ventilation units via Modbus RTU.

29 registers13

Wattsonic - Schmachtl Sun Energy Box

Wattsonic

Modbus RTU

Monitors Schmachtl Wattsonic hybrid inverter via Modbus RTU

92 registers72

Heidelberg Wallbox Energy Control

AMPERFIED GmbH

Modbus RTU

Controls and monitors Heidelberg Wallbox Energy Control EV charger via Modbus RTU.

22 registers67

connecdoor.controller

connecdoor

Modbus RTU

Controls and monitors smart door access points via RS485

0 registers53

Belimo Air-Water Actuator Modbus RTU

Belimo

Modbus RTU

Controls communicative damper and valve actuators via Modbus RTU.

20 registers46

Specifications

Protocol: Modbus RTU
Brand: Evikon
Registers: 8
Compatible models: E2618
Last updated: 2 April 2026

Want to professionalise your projects?

EU-hosted

Data in the Netherlands and Germany

Open standard

Based on Modbus RTU/TCP

Free to browse

No account or payment required

European company

Based in the Netherlands