Rs485 addresses for KC868-A6 relays

Rs485 addresses for KC868-A6 relays - Printable Version

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+--- Thread: Rs485 addresses for KC868-A6 relays (/showthread.php?tid=9066)

Rs485 addresses for KC868-A6 relays - Yuriy - 02-21-2026

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.

RE: Rs485 addresses for KC868-A6 relays - admin - 02-21-2026

this is RS485 modbus protocol document: https://www.kincony.com/forum/showthread.php?tid=2528

RE: Rs485 addresses for KC868-A6 relays - Yuriy - 02-22-2026

(02-21-2026, 10:27 PM)admin Wrote: this is RS485 modbus protocol document: https://www.kincony.com/forum/showthread.php?tid=2528

Thank you for your answer.
But in that document relays addresses described in the different format.

Example from modbus_controller documentation esphome

Code:
switch:

- platform: modbus_controller

  ...

  address: 0x15

If i am not mistaken, it's register addresses of relays

RE: Rs485 addresses for KC868-A6 relays - Yuriy - 02-22-2026

Addition

KC868-A6 don’t get response by different requests (address scan, slave scan, write single coil, etc) - Timeout error, by Modbus Poll software

Am I right, that

Code:
uart:

  - id: rs485

    tx_pin: GPIO27

    rx_pin: GPIO14

    baud_rate: 9600

    stop_bits: 1

    parity: NONE

modbus:

  id: modbus1

  uart_id: rs485

modbus_controller:

- id: modbus_device

  address: 0x1 

  modbus_id: modbus1

  setup_priority: -10

in ESPhome firmware enough to enable modbus for KC868-A6 and it must give back response for example for request 01 05 00 00 FF 00 8C 3A by Modbus Poll?

RE: Rs485 addresses for KC868-A6 relays - admin - 02-22-2026

yes, if you download KCS v2 firmware for A6 board, then enable RS485 modbus protocol, you can control relay by modbus.
if you want config by ESPHome, you need config all modbus by yourself.
you can see this video tour: https://youtu.be/xmBWzVGpggo

RE: Rs485 addresses for KC868-A6 relays - Yuriy - 02-23-2026

(02-22-2026, 10:58 PM)admin Wrote: yes, if you download KCS v2 firmware for A6 board, then enable RS485 modbus protocol, you can control relay by modbus.
if you want config by ESPHome, you need config all modbus by yourself.
you can see this video tour: https://youtu.be/xmBWzVGpggo

Thank you for your answer.

But in your video there is no ESPhome firmwere as client.

If anybody know, tell me please, how can i enable modbus in clinet ESPhome firmware.

Thank you in advance.