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RS-485 Termination, Bias & Node-Load Calculator

Check termination loading, fail-safe bias voltage, resistor dissipation and transceiver unit-load capacity.

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RS-485 physical-layer planning

Check termination, bias and node loading

DC fail-safe estimate

Bias supply voltage

Pull-up resistor

Pull-down resistor

Termination resistor

Number of terminations Transceiver unit load Connected transceivers Target idle differential

Effective termination60.0 Ωtwo 120 Ω resistors in parallel

Estimated idle differential0.211 VMeets 0.200 V target

Bias current3.52 mAPull-up/down 8.4 mW each

Node capacity128 nodes8.0 of 32 unit loads used

Terminate only the two physical ends of a linear trunk. Confirm transceiver input resistance, internal bias networks and receiver thresholds from the actual datasheets.

Technology insights

Professional engineering articles

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

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

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