Assistance with RS485 Communication via KC868-A16 & Wemos D1

[Bastn]

Hi,
I currently have the following setup:

• Wemos D1 (ESP8266) connected to the Wi-Fi network.
  
• KC868-A16 connected to the Wi-Fi network, running KCS firmware V2.
  
• RS485 I/O module (25IOB16) connected to the KC868-A16 via RS485 (A/B).
  

I want to be able to read and write the inputs and outputs of the RS485 I/O module (25IOB16) using:

• or IFTTT through the KC868-A16.
  
• orA Wemos D1 (ESP8266) running Arduino code, connected to the same Wi-Fi network as the KC868-A16.
  

Issues I’m Facing:

• I am unable to send or receive RS485 commands via IFTTT on the KC868-A16. (not supported by software?)
  
• I am unable to send or receive RS485 commands from a small web UI on the Wemos D1 to the RS485 I/O module (25IOB16).
  

Objective:
I am looking to replace my current PLC, which simply toggles outputs based on input signals in my house.
Could you provide guidance on how to achieve this?
Thanks!