Serial Communication
RS485 Communication in Factory Automation
Understand topology, termination, grounding and signal-conversion considerations for stable RS485 networks on the factory floor.
Technical Guide
Build a predictable bus topology
RS485 networks are generally most stable when devices are connected along a controlled bus with short branch connections. Record cable length, device count and baud rate before deciding the topology.
Control termination, biasing and grounding
Termination and biasing should follow the equipment and system design. Grounding and shielding practices must account for the electrical environment and potential differences between locations.
- Avoid unnecessary long stubs.
- Keep polarity and terminal naming consistent across devices.
- Verify communication at the intended baud rate under real operating conditions.
Use isolation where the environment requires it
Isolation can help protect connected equipment and reduce the effect of ground-potential differences and industrial interference. Select converters and device servers using verified isolation and power specifications.