Multi LX200V30 on a PLC line

Hello, on my setup I need 3 PLC (LX200V30):
  

  Windows PC
           |
        PLC1
           |
           |
 │-------------------- │
PLC3                PLC2
   |                          |
   Switch              LAN Device (CSE-M53)
|                |
RPI      Camera

I got a communication with the Windows PC and RPI/Camera, Windows PC and my CSE-M53. But I don’t have the communication between my RPI and my CSE-M53.

I read that the PLC works as master/slave, and slave are communicating with the master but not between slave.

So I beleive that the PLC1 is the master and the other are the slave.

I need the PLC2 to be the master and the other slave, how to do this ? I donwloaded Avitar, but there is no documentation