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Baud Rate & Cable Length

Estimate a practical RS-485 cable-length envelope from baud rate, cable conditions and network topology.

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PracticalBuilt for industrial workflows

RS-485 planning estimator

Estimate baud rate and cable length

Planning envelope · not a compliance limit

Baud rate Required cable length Length unit Cable / environment

Network topology Serial framing

Estimated maximum length694 mfor the entered baud rate

Estimated maximum baud640 kbpsfor the required cable length

Suggested standard rate500 kbpshighest common rate below the estimate

Character time86.8 µsBit time 8.68 µs

Verify the final network on the actual installation. Transceiver characteristics, cable impedance and capacitance, termination, stubs, grounding, isolation, surge protection and electromagnetic noise can materially change the usable distance.

Technology insights

Professional engineering articles

Practical guidance derived from the current PyXis and Titania technical material.

Article Professional 2214 Rs485 Modbus Network Engineering

Technology article

RS-485 Modbus Network Engineering for Industrial Devices

Topology, addressing, baud rate, termination, bias, response delay and commissioning practices for reliable Modbus RTU.

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