Hello everybody,

I want to build a full duplex RS485 network.

I also want to distribute the supply voltage of my microcontrollers over additional twisted pairs of the RS485 cable (at a level of 24 V).

I think I have to use galvanically isolated interfaces due to a rough environment with long cables.

1. Wich DC/DC converter (24 V to 5 V) can you recommend?

2. Whats the best interface chip: 75ALS180 (with external optocouplers, etc.), LTC1535, MAX1490B or another one, I don't know?

Thank you, Michael