LM und Daikin RTD-W - Modbus

[mkoermer]

Hello everybody,

has any of you already successfully connected the Daikin RTD-W to the LM?
Regardless of which Modbus address I give the device, it is not found by the LM - manual integration does not work either, as there is no connection to the device.

Here is the page for the Daikin RTD-W device:
https://www.daikin.de/de_de/produkte/RTD-W.html

maybe someone knows some advice?

Best regards
Michael

[admin]

Have you tried using another RS485 port? Maybe A/B are swapped? You can also try USB-RS485 adapter and connect to your PC to check if it works. Maybe the serial port settings are wrong?

[mkoermer]

Hello,
I activated RTU1 and set the settings for this connection to the values ​​according to the manual - unfortunately without success.
I also tested all other options, but the device cannot be found.

I tried different Modbus addresses - from 1 to 8 everything already tested, but without success.

I don't have an RS485 / USB adapter yet ...

still have an idea? ;-)


Best regards
Michael

[Daniel]

How do you test? Do you use RTU read test?

[alexll]

Be aware about the connection settings:

Mode Modbus RTU Slave
Baud rate 9600
Parity None
Stop bits 1
Registry base 0

From https://www.acae.es/catalogos/daikin/fie...268899.pdf (in Spanish)

[mkoermer]

have made these settings ... unfortunately no improvement ...

... no device is found.

[Daniel]

Are you using RTU SCAN? This can work only if you already have valid profile. Use RTU read test and try to read individual registry.

[mkoermer]

Yes, I used RTU Scan without having a profile for it - now I have acc. want to read out the holding register H0001 according to the instructions - the following error message ;-(

[Daniel]

Do you have documentation in EN?
Check cable and make sure GND is connected.

[mkoermer]

yes ;-)
look here:
http://www.realtime-controls.co.uk/rtd/D...0-1.07.pdf

(Link)

thank you for your help!

---

Do you have documentation in EN?
Check cable and make sure GND is connected.

HI Daniel,

cable is ok, and GND ist connected!


Best regards
Michael

[Daniel]

Doc is in DE so I partially understand it. Did you change the default RTU settings? Do not use address 0, change it to 1 at last.

[mkoermer]

Doc is in DE so I partially understand it. Did you change the default RTU settings? Do not use address 0, change it to 1 at last.

sorry, look here:
http://tinlavir.ro/parteneri/2_VRV/4_Con...0-1.07.pdf

Link

you mean the Modbus address of the device? currently only DIP 8 is on = Modbus address 1.

I get the following error message when I manually integrate the device - I created a profile with a template.

[Daniel]

Do I understand it right that the same interface is used for D-bus and for Modbus? If yes then somehow it must be switched over. Manual says nothing about it. Do not use address 0 as in default change to 1. For testing use holding registers, int16.

[admin]

Please provide your profile

[mkoermer]

Short intermediate result, if I now query a holding register under RTU read test z. B. H0001 (i.e. 1) I also get an answer from the device!

Here is the picture.

d. H. but that the connection to the device works right?

But then why the error message?

---

Please provide your profile

Code:

{
  "product_code": "RT",
  "manufacturer": "Realtime",
  "name": "RTD-W Control",
  "product_range": "Realtime Modbus",
  "description": "Realtime Modbus RT ",
  "mapping": [
    {
      "name": "Sollwert Wasservorlauf Heizen",
      "address": "H0001",
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad",
      "read_swap": "n"
    },
    {
      "name": "Sollwert Wasservorlauf Kuehlen",
      "address": "H0002",
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad",
      "read_swap": "n"
    },
    {
      "name": "Betrieb ein/aus",
      "address": "H0004",
      "bus_datatype": 1,
      "datatype": "bool",
      "type": "register",
      "units": "",
      "read_swap": "n"
    },
    {
      "name": "Auslesen Betrieb ein/aus",
      "address": "I0070",
      "bus_datatype": 1,
      "datatype": "bool",
      "type": "register",
      "units": ""
    }
  ]
}

[admin]

address field must be a number, not a string

[Daniel]

Datatype is not bool this device support only registers which are int16 or uint16. You must add scaling of 0.01 for your temp. Read swap is not needed.

[mkoermer]

HI,
Thanks for your help!!!

Look here:

Code:

{
  "product_code": "RT",
  "manufacturer": "Realtime",
  "name": "RTD-W Control",
  "product_range": "Realtime Modbus",
  "description": "Realtime Modbus RT ",
  "mapping": [
    {
      "name": "Sollwert Wasservorlauf Heizen",
      "address": 1,
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad"
    },
    {
      "name": "Sollwert Wasservorlauf Kuehlen",
      "address": 2,
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad"
    }
  ]
}

would it be ok?

[Daniel]

You still missing "value_multiplier": 0.01, as those two are temps.

[mkoermer]

so?

Code:

{
  "product_code": "RT",
  "manufacturer": "Realtime",
  "name": "RTD-W Control",
  "product_range": "Realtime Modbus",
  "description": "Realtime Modbus RT ",
  "mapping": [
    {
      "name": "Sollwert Wasservorlauf Heizen",
      "address": 1,
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad",
      "value_multiplier": "0.01"
    },
    {
      "name": "Sollwert Wasservorlauf Kuehlen",
      "address": 2,
      "bus_datatype": 7,
      "datatype": "uint16",
      "type": "register",
      "units": "Grad",
      "value_multiplier": "0.01"
    }
  ]
}