'Invalid response from device'

[AlvinKleine]

Trying to create serial connection to Nilan, but getting error "invalid response from device".

Setup

• HA on Raspberry PI 4
• CTI USB-Nano-485 Interface Converter (connected to HA USB0)
• Nilan CTS602 with SW 2.38

...any thoughts?

Br
Beginner

[veista]

Most likely cause is wrong device path. Other is A and B wires connected opposite or missing termination resistor.

[veista]

Go to settings->system->hardware->"three dots"->all hardware

Find the correct usb adapter. Copy path.

[veista]

Missing ground wire could also be one cause.

[AlvinKleine]

Thank You! Issue solved. I had physical wire connection problem.

[veista]

Thank You! Issue solved. I had physical wire connection problem.

You are most welcome.

[veista]

I would be interested in your device bus version. If you could kindly report it here #9. Thanks.

[AlvinKleine]

I would be interested in your device bus version. If you could kindly report it here #9. Thanks.

reported, it's 19

Should one still be able to run following type of holding register services even your perfect HACS is active? Looking to build Nordpool sensor triggered automations w/o python skills, but e.g. below service does not turn PILP off:

service: modbus.write_register
data:
address: 1001
slave: 30
value: 0
hub: hub1