ESPHome Modbus config for KC868-A6

ESPHome Modbus config for KC868-A6 - Printable Version

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ESPHome Modbus config for KC868-A6 - aucirc - 10-04-2024

Is this the correct ESPHome configuration for RS-485 Modbus on KC-868 A6?

Code:
uart:

  id: mbus

  tx_pin: GPIO12

  rx_pin: GPIO13

  baud_rate: 9600

modbus:

  id: modbus1

  uart_id: mbus

  send_wait_time: 500ms

modbus_controller:

- id: wp3082adam1

  address: 1

  modbus_id: modbus1

  update_interval: 5s

I'm trying to use this with WellPro WP3082ADAM:

Code:
text_sensor:

- name: "analoginputs"

  platform: modbus_controller

  modbus_controller_id: wp3082adam1

  id: test

  # internal: true

  register_type: holding

  address: 0x0000

  register_count: 8

  raw_encode: HEXBYTES

  response_size: 10

This is sending correct command to the wp3082adam, but ESPHome it never receives a response:

Code:
Modbus command to device=1 register=0x00 no response received - removed from send queue

The frustrating this is I can see the holding register request from the A6 and the response from the WP3082ADAM when monitoring the wire, everything seems to be working perfectly, but A6 can't "hear" the modbus response.

sent from A6:
{01}{03}{00}{00}{00}{08}{44}{0C}
response from wp3082adam:
{01}{03}{10}{00}{00}{00}{00}{00}{00}{00}{00}{03}{34}{00}{00}{00}{00}{00}{00}{D1}{8F}

I would appreciate any suggestions

RE: ESPHome Modbus config for KC868-A6 - admin - 10-05-2024

sorry, i don't know the "WP3082ADAM". maybe you can use USB-RS485 adapter to test firstly. when you send command manually and check whether have feedback. if OK, then test with ESPHome.

RE: ESPHome Modbus config for KC868-A6 - aucirc - 10-05-2024

(10-05-2024, 12:45 AM)admin Wrote: sorry, i don't know the "WP3082ADAM". maybe you can use USB-RS485 adapter to test firstly. when you send command manually and check whether have feedback. if OK, then test with ESPHome.

Yes have already done this - sending the same command and seeing the same response:

[Image: 98O6odA.png]

Just having issues getting ESPHome to hear the response. Can you confirm if I have the correct GPIO pin assignment for RS-485 on the KC868-A6?

uart:
id: mbus
tx_pin: GPIO12
rx_pin: GPIO13
baud_rate: 9600

I couldn't find this information for A6 anywhere and referred to the schematic.

RE: ESPHome Modbus config for KC868-A6 - aucirc - 10-05-2024

(10-05-2024, 12:45 AM)admin Wrote: sorry, i don't know the "WP3082ADAM". maybe you can use USB-RS485 adapter to test firstly. when you send command manually and check whether have feedback. if OK, then test with ESPHome.

Hey I just realised I was reading the schematic incorrectly.

The correct GPIO pins for RS485 on A6 are described here:
https://devices.esphome.io/devices/KinCony-KC868-A6

In case this is helpful for anyone else, I now have RS485 working on A6 using following ESPHome config:

Code:
uart:

  - id: rs485

    tx_pin: GPIO27

    rx_pin: GPIO14

    baud_rate: 9600

  - id: rs232

    tx_pin: GPIO17

    rx_pin: GPIO16

    baud_rate: 9600

modbus:

  id: modbus1

  uart_id: rs485

  send_wait_time: 200ms

modbus_controller:

- id: wp3082adam1

  address: 1

  modbus_id: modbus1

  update_interval: 2s

Now receiving data correctly in ESPHome:
[14:15:20][D][text_sensor:064]: 'analoginputs': Sending state '00000000000000000334'

RE: ESPHome Modbus config for KC868-A6 - admin - 10-05-2024

ok, good.