Rs485 addresses for KC868-A6 relays

[Yuriy]

Hello everyone!
Please, help me, what are the Rs485 addresses (for ESPhome firmware) of the KC868-A6 relays?

Code:

switch:
- platform: modbus_controller
  modbus_controller_id: modbus_device
  name: "Relay rs485"
  register_type: coil
  address: ???????????????
  bitmask: 1

Thank you in advance.