The maximum cable length supported by the ST485ABDR is 1200 meters, but it depends on the baud rate and the cable characteristics.
To ensure reliable data transmission over long distances, use a shielded twisted pair cable, keep the transmitter and receiver grounds connected, and use a common mode choke or ferrite bead to reduce electromagnetic interference.
The ST485ABDR supports data rates up to 10 Mbps, but the maximum data rate depends on the specific application and cable characteristics.
To handle bus contention and collisions, implement a collision detection and arbitration mechanism, such as a token-passing protocol or a master-slave architecture, to ensure only one device transmits at a time.
Key considerations include cable selection, termination, and grounding, as well as ensuring proper signal integrity, noise reduction, and electromagnetic compatibility.
ST485ABDR datasheet
by STMicroelectronics
