As you know the RS422 / RS485 standard requires the cabling of equipment in a daisy chain.

However, sometimes especially in buildings, this constraint complicates the routing of the cables when all the control devices are grouped together in a central technical room.

This board makes it possible to resolve this difficulty with one incoming connection and 4 outgoing in star topology while respecting the recommendations of the standards.

This circuit uses only logic circuits and does not require any software development.