DCS Bios RS485 Issue

[Alburg]

Good morning everyone,

 

I've been playing around with DCS Bios and the RS485 bus lately,

but I can't get it to work.

 

Ian already suggested that I load the sketeches onto the Arduinos using a ISP so I bought a USBTinyISP.

It loads the Master and Slave sketches on the Mega2560s but the communication doesn't work when connected to a MAX485 board.

 

Then I read that all MAX485 have to share GND, tried that still doesn't work.

 

Anyone have an idea?

 

Thanks and cheers

Sven