RS-485 Bus Topology (Multi-drop)
Master
(FPGA)
RS-485
A (+)
B (−)
120Ω
Term.
120Ω
Term.
Node 1
Sensor / PLC
Node 2
Sensor / PLC
Node 3
Sensor / PLC
···
Node 32
Sensor / PLC
Up to 32 nodes on a single bus (max 1,200 m)