Cabling RS-485 bus
If the remote devices have been installed correctly, all the bus communication LEDs on each device should flash . If some of them
don't flash, it means that the device has not been installed and programmed correctly (check cabling, address and programming in the
control unit) .
TRADITIONAL CABLING (ENTRY-EXIT)
CABLING WITH BRANCHING
The branching consists of a cable with 3 pairs, 2 of which are twisted (each pair is made up of conductors A and B) .
Analysing the circuit made in this way, you can see that the structure of the RS-485 bus is still linear (entry-exit) .