Could you provide local IP settings?
I guess that you have wrong netwotrk settings.
I was refering to this in the documentation of your converter :
2.3.2. VCOM ApplicationUser can download VCOM software from http://www.usriot.com/usr-vcom-virtual-serial-software/.Through this software user can set up connection between TCP232-304 and virtual serial to solve the problem that traditional equipment PC software used in serial port communication way.
And you should keep in mind that modbus protocol is not the same in serial line and in IP.
It did not help :
2020-09-13 09:08:46 ERROR (SyncWorker_35) [pymodbus.client.sync] Connection to (192.168.1.230, 8234) failed: [Errno 111] Connection refused
2020-09-13 09:08:46 ERROR (SyncWorker_29) [pymodbus.client.sync] Connection to (192.168.1.230, 8234) failed: [Errno 111] Connection refused
2020-09-13 09:08:46 ERROR (SyncWorker_22) [pymodbus.client.sync] Connection to (192.168.1.230, 8234) failed: [Errno 111] Connection refused
And :
Whereas with the 20208 port, the Ip of HA is displayed :
And in the log :
2020-09-13 09:14:09 DEBUG (SyncWorker_9) [pymodbus.client.sync] New Transaction state 'SENDING'
2020-09-13 09:14:09 DEBUG (SyncWorker_30) [pymodbus.client.sync] New Transaction state 'SENDING'
2020-09-13 09:14:09 DEBUG (SyncWorker_48) [pymodbus.client.sync] New Transaction state 'SENDING'
My boiler is a âbi-masterâ Modbus, which means slave for 5 seconds, and master for 5 seconds.
May be it is the problem ?
Very strange, because a apache/php server and the adapted page, is able to display the following page, and I even can change my boiler temperature, through this page :
I cannot believe HA not to be able to do that too âŚ
To answer your last question, the solution you are refering to is a dedicated solution for De Dietrich boiler based on an Apache server. The communication system is adapted to the remote serial port over Ethernet. Home Assistant is much more versatile, thow not adapted to your setup.
But i made a few research and i think you could make some test based on this github issue : https://github.com/riptideio/pymodbus/issues/382 focusing on this linux command :
sudo socat pty,link=/dev/virtualcom12,raw tcp:192.168.0.7:8899
In short it is based on a virtual device on your home assistant platform that forwards the data in and out to a remote IP/socket equipment.
I never experimented this but it looks like an option.
Oh, Iâll try that,
And once again, thanks for your interest.
Hi everyone! Did you get the communication with De Dietrich Boiler working now? I was wondering if it is possible to do it over ESPhome, like for example it is working with SDM630.
I didnât get it to work 
For me it is working perfect from a direct connection to my Home Assistant host; they are sitting nearby. Your idea to use it with ESPhome is a good idea if you can see the ESPHome as a remote serial from your host. You will need to use a TTL to RS485 converter.
I was able to get it working on my USR-TCP232-304, with my systemair and modbus control:
modbus:
- name: Systemair
type: rtuovertcp
port: 2020
host: 172.16.16.116
1 Like
I just tested again, but no way to get it work.
Thanks anyway for your help.
Hello,
The adapter shouldnât decode modbus itself, serial mode is enough.
But you donât receive anything, I think you have an issue with your wiring.
Have a look here:
[Diematic_to_MQTT/ModBusMiniDinConnection.png at f38d845c2e8fb0e07000af12135423ac94e342b0 ¡ Benoit3/Diematic_to_MQTT ¡ GitHub]here)
On my side itâs work perfectly with settings you have.
Regards
1 Like
Hi,
There seems not to be a issue with wiring, because I can interact with the heater, through a homemade html page :
I just need to integrate it properly in HA, in order to create automations, buttons, aso.
Nice to hear it! how did you get it to work? My friend could help me integrate the values to HA. If you have it on your custom html page, this mean, there should be an easy way to get it shown in HA. Could you describe how do you connect, what hardware/software are you using?
Yes, everithing is detailed here in the link given above.
Thanks to Benoit3 for his work.
Hi,
I am in the same situation here : I am trying to hook up My De Dietrich Diematic 3 Boiler to Home Assistant.
Using a waveshare RS485 to ethernet adapter, I am able to read out the modbus registers correctly, using the âAVReporter Modbus Communication Testerâ software tool. So the hardware/cabling is okay.
Now I am trying read the registers via Home assistant.
Can some share their configuration.yaml? Because the sensor values are not appearing in home assistant for me. (What is the best way to check if the sensors are available?). There are no error log entries.
My config :
modbus:
- name: "Waveshare"
type: rtuovertcp
host: 192.168.2.245
port: 20108
sensor:
- platform: modbus
scan_interval: 10 # in seconds
registers:
- name: "My_hours"
hub: "Waveshare"
slave: 10
register: 4
Count: 1
register_type: holding
data_type: int
- name: "My_minutes"
hub: "Waveshare"
slave: 10
register: 5
count: 1
register_type: holding
data_type: int
I have made some progress.
With this configuration : 1 temperature value sometimes is captured (I get a value), and a little later it is unavailable again. I donât understand why. With the âAVReport Modbus Communication testerâ, I can read any register always correctly and instantaniously (< 100ms).
If I define multiple sensors, some get read and they switch back and forth to readable and unavailble. Also the values get mixed between the sensors.
Iâve played around with timeouts, lazy_error_counts, scan_interval, retries,⌠but nothing helps.
I feel like Iâm close, but canât find a good working configuration.
modbus:
- name: Waveshare
type: rtuovertcp
host: 192.168.2.245
port: 20108
retry_on_empty: true
close_comm_on_error: false
retries: 10
timeout: 15
delay: 2
sensors:
- name: Temperatuur_badkamer
slave: 10
address: 18
count: 1
input_type: holding
data_type: int16
lazy_error_count: 5
scale: 0.1
precision: 1
unit_of_measurement: '°C'
device_class: "temperature"
scan_interval: 20