Understand Configuration For Own Software

[Dm81]

Hello everyone
I would like to understand the correct configuration to control your devices
I want to write my own home automation program, I will use lazarus (freepascal)
I bought the following modules:

•  KC868-H16B
  
• KC868-H32B
  
• KC868-COLB
  
• KC868-D8
  
• Push button switch module
  

my questions are these:
I thought about connecting:

• Pushbutton switch module with KC868-COLB through RS232
  
• KC868-COLB with KC868-H32B through RS232
  
• KC868-COLB, KC868-D8 and KC868-H16B through the LAN network to PC
  

My goal is to control each input and through the software activate the output
Is the configuration correct?
I have other questiones but I don't have space enought in thi post
thank you very  much for any help