Wavin Sentio Modbus

Hi all.

I have installed Modbus Binding

I succes in connect with my `Wavin Sentio master for flor heat control. it is online

I have set the master up so that i can read and write

But now i need a little help in how i setup the thermostats and valve.

Hope someone can help me :slight_smile:

regards Christian

You should provide a lot more information.

Since Modbus:

  • RTU or TCP?
  • Slave addresses
  • register / coil addressen
  • Documentation about your hardware

Cheers :slight_smile:


Sorry for the late answer - I have now found Documentation about the hardware.

Slave adddresses - Is this the ip on the network?
Register / coil addresses - Need more explanation

Here is the documentation.
Sentio Modbus Values_SW_Ver_6.pdf (207.5 KB)


1 Like

For TCP, you will need to know the IP address of your target device.
That comes in nn.nn.nn.nn form

But Modbus-TCP devices also have (at least one) slave address aka slave id aka slave number. It’s just a simple number between 1 - 250
For most TCP devices it’s just 1 though.

But you’re already past this point??

Bit confused because the doc you show us talks about serial settings, implying its a Modbus-RTU device probably ove RS485 serial wiring

The holding registers are the ones that you can write to from OH. .
I expect the ones you are interested in will be the room modes and setpoints.

Hi Christian

How did you find this document and how did you know how to connect to the Modbus tcp.
I own a Wavin sentio and all I can find is what port I need to connect to if I want to use it.

no standard ip configuration and it is for sure not setup as dhcp from start.

  • Allan

Comment; a lot of Modbus-TCP devices just don’t do DHCP at all, by design.
Modbus-TCP is reliant on IP address, no mechanism for naming etc., so fixed manually assigned IP is the order of the day.

yes I know but then there will be a standard IP adresse to connect to in the manual.
but I have found now that this system got Modbus RTU because you have to setup the baud rate and etc in the setup screen. and TCP it is ip adresses and port numbers.

it was confusing because the Modbus port is a normal ethernet lan port.

Ah, yes, RJ45 connectors get used for RS485 too.
Next challenge will be pinout …