rs485 communication

[Millman]

Hi, now it works fine with only 2 tools, but when I connect another 2 addresses crazy.
In the attached diagram, maybe some wrong connection.
thank you

[Millman]

if I try to do a reset all communicate, maybe there is a problem as they are questioned?
I hope someone can help
thank you

[Millman]

RS485

[Millman]

Hi WoB I tried today everything worked perfectly, your suggestions are always valuable.
Thank you so much