990-66229A-001

Connect the Modbus Cables

NOTE: For cyber security protection, strict access control to the installation room must be exerted at all times.
  1. Connect the Modbus cables to the terminal RS485 of the UPS(s). Use a 2-wire connection.
    • All Modbus signal cables shall be double insulated/jacket cable and minimum rated for 30 VDC.

    • Wiring should be done in accordance with local wiring codes.

    • Route signal cables separately from power cables to ensure sufficient isolation.

    2-Wire Connection with Two UPSs

  2. Install 150 Ohm termination resistors at each end of each bus if the buses are very long and operate at high data rates. Buses under 610 meters at 9600 baud or under 305 meters at 19200 baud should not require termination resistors.
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