Questions about KinCony String Protocol over RS485 for ESPHome Integration

[itzek]

Hello KinCony Admin
I want to send activation commands from 1 KC868-A to 2 different H32B PRO controllers.
I'm integrating a KC868-AK ESP32 board (as an input controller) with other KinCony relay boards (as slaves) using RS485 and your String Protocol. I've seen the KC868-A-series-protocol-String_firmware_V2-2.pdf document and understand that the String Protocol is supported over RS485.

1. String Protocol DEV_ID: How is the DEV_ID (e.g., "255" in RELAY-KEY-255,id,1) set/configured on KinCony relay boards for RS485 String Protocol? Is there a default, and can it be changed?
   
2. RS485 Settings: What are the exact default/recommended RS485 settings (Baud Rate, Stop Bits, Parity) for KinCony boards using the String Protocol?
   
3. RTS Pin for KC868-AK RS485: Is an RTS pin required for RS485 communicationon the KC868-AK ESP32 with the String Protocol? If so, which GPIO pin and is it active HIGH/LOW?
   
4. Relay ID Mapping:  Does the id in RELAY-KEY-DEV_ID,id,1 directly correspond to the physical relay number (e.g., id=1 for Relay 1, id=16 for Relay 16)?
   

Thank you for your help