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EOL resistor specification for RS-485 bus and input configuration

EOL resistor specification for RS-485 bus and input configuration

Issue

Tolerances for resistors when used for RS485 bus termination and EOL for double balanced inputs.

Product Line

Security Expert

Environment

Wiring

Cause

Resistor specification required for ordering purposes.

Resolution

330 ohm EOL resistors are required for the RS-485 bus and 1K ohm resistors for EOL zone (input) configuration.

  • 330 ohm = 5% tolerance, Metal film
  • 1000 ohm = 1% tolerance, Metal Film
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