7.2.2.2 RS485 link configuration for 2 wires connexion

Set the SA2 switches like below to set the RS485 mode:

Set the SA1 switches to select the two wires configuration with no termination:

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Network Management Card – User Manual

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MGE UPS Systems 66103, 66102 user manual 2.2 RS485 link configuration for 2 wires connexion