Modbus TCP configuration switches

Configuration
1

Hi all, I have a question related to the modbus TCP integration home assistant.
I have Relay Board PLC from aliexpress Relay Board PLC RS485
And i can control switch via modbus poll like:
open 01 06 00 01 01 00
close 01 06 00 01 02 00
where slave id: 01
function code: 06
channel number: 00 01
command: 01 00 or 02 00

But I couldn’t connect to Relay via Home Assistant.

modbus:    
type: tcp    
host: 192.168.20.60    
port: 502    

- platform: modbus    
  registers:    
  - name: Register1MB    
    slave: 0    
    register: 1    
    command_on: 1    
    command_off: 2    
 - name: Register3    
   slave: 1    
   register: 2    
   command_on: 1    
   command_off: 2

Can anybody help?
And how to debug modbus?

homeassistant.components.modbus: debug

Doesn’t help.

2

I test coonect via modpool tool and get this.

linux_x86-64/modpoll -m enc -a1 -r4 -c1 -t4:hex 192.168.20.60
modpoll 3.6 - FieldTalk™ Modbus® Master Simulator
Copyright © 2002-2018 proconX Pty Ltd
Visit https://www.modbusdriver.com for Modbus libraries and tools.
Protocol configuration: Encapsulated RTU over TCP
Slave configuration…: address = 1, start reference = 4, count = 1
Communication…: 192.168.20.60, port 502, t/o 1.00 s, poll rate 1000 ms
Data type…: 16-bit register (hex), output (holding) register table
– Polling slave… (Ctrl-C to stop)
[4]: 0x0001

I read 4 register from slaveID:1. BUT it worked only with
-m enc Encapsulated Modbus RTU over TCP

3

Hi @Yury_Pavlovsky,

have you been able to control the relay via Home Assistant now?

4

No, it was a test. And I don’t use this relay now.

5

You need to read the Modbus docs and Modbus switch

The important part for you is that…A valid modbus Hub needs to be configured and you need to take a look at your syntax

modbus: 
     name: HubName   
     type: tcp    
     host: 192.168.20.60    
     port: 502    

- platform: modbus    
  coils:     
     - name: Register1MB 
       hub: HubName 
       slave: 0    
       register: 1    
       command_on: 1    
       command_off: 2