I've set up an RS485 network with 4 nodes + my computer, which communicates via a USB-to-RS485 unit. The nodes are PIC16F345 processors, each with a MAX485 transceiver chip. It all works well in master-slave mode, with the computer as master, initiating every exchange. Now I'm wondering how difficult it would be to run the network as a token-passing system not requiring a computer. I've tried to find out whether anyone has done this before, in a minimal manner. It seems that token-passing...
Minimal token-passing network via RS485?
Minimal token-passing network via RS485?