Why does the gateway fail to communicate with the Olimpia Splendid unit directly over RS-485?

The B0686 electronics use Modbus ASCII, not Modbus RTU. You must install a Cel-Mar ADA-4040PC1 converter between the gateway and the B0686 board to translate between the two protocols.

What baud rate and parity settings should I use?

Set all devices on the bus to 9600 baud with odd parity. This includes the ModbusCloud gateway, the Cel-Mar converter, and the B0686 electronics.

Which Olimpia Splendid models are supported by this template?

The template supports models B0372, B0375, and B0685. The B0686 is the electronics communication board used by these units, not a standalone model.

Can I control multiple Olimpia Splendid units on the same RS-485 bus?

Yes, as long as each unit has a unique Modbus device address. Ensure all units share the same baud rate and parity settings on the bus.

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Free Modbus template: Olimpia Splendid | ModbusCloud

///Olimpia Splendid

Modbus RTU

Olimpia Splendid

Name: Olimpia Splendid
Brand: Olimpia Splendid
SKU: 1c98368e-eefc-43bc-9af5-19021a5285b4

Controls Olimpia Splendid heating and cooling systems via Modbus RTU

Overview

This template integrates Olimpia Splendid heating and cooling systems via Modbus RTU. It reads device status and ambient temperature, and allows writing temperature setpoints. A Modbus ASCII to RTU converter is required between the gateway and the B0686 electronics.

Key readings

Status Registers
Device Address

Available commands

Status Registers
Temperature Setpoint
Temperature Ambiente

Use cases

Monitor the operating status of Olimpia Splendid heating and cooling units on a live cloud dashboard.
Adjust temperature setpoints remotely without requiring an on-site visit to the installation.
Create an alert when ambient temperature deviates from the configured setpoint for a defined period.
Log historical temperature and status data to identify trends and optimize comfort settings.
Verify correct device communication after initial installation by checking status registers in real time.

Installation

1Wire the ModbusCloud gateway (MCG or MLP series) RS-485 output to the Cel-Mar ADA-4040PC1 Modbus ASCII to RTU converter.
2Connect the Cel-Mar ADA-4040PC1 converter output to the Olimpia Splendid B0686 electronics board using the appropriate RS-485 cabling.
3Configure the baud rate to 9600 and parity to odd on the gateway, the converter, and the B0686 electronics to ensure all devices match.
4Set the correct Modbus device address on the Olimpia Splendid unit, ensuring it does not conflict with other devices on the bus.
5Import the Olimpia Splendid template in the ModbusCloud platform and assign it to the configured gateway and device address.
6Verify communication by checking that status registers and ambient temperature values appear correctly on the ModbusCloud dashboard.

Things to watch for

Why does the gateway fail to communicate with the Olimpia Splendid unit directly over RS-485?: The B0686 electronics use Modbus ASCII, not Modbus RTU. You must install a Cel-Mar ADA-4040PC1 converter between the gateway and the B0686 board to translate between the two protocols.
What baud rate and parity settings should I use?: Set all devices on the bus to 9600 baud with odd parity. This includes the ModbusCloud gateway, the Cel-Mar converter, and the B0686 electronics.
Which Olimpia Splendid models are supported by this template?: The template supports models B0372, B0375, and B0685. The B0686 is the electronics communication board used by these units, not a standalone model.
Can I control multiple Olimpia Splendid units on the same RS-485 bus?: Yes, as long as each unit has a unique Modbus device address. Ensure all units share the same baud rate and parity settings on the bus.

Registers (4)

2 read / 3 write

Name	Address	Function	Type	Access
Status Registers	101	FC03	uint16	R/W
Address	200	FC03	uint16	R
Temperature Setpoint	102	FC06	uint16	W
Temperature Ambiente	103	FC06	uint16	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 RTU
Brand: Olimpia Splendid
Registers: 4
Compatible models: B0372B0375B0685B0686
Last updated: 17 April 2026

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