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Klemm-nummer Power 24 V AC/DC 93, 94 Important: The common power connection (terminal 33) must be connected to Earth. ABB Cylon recommend that this is done at the 24 V AC transformer. 95, 96 RS-485 Port 1 (BACnet® MS/TP or Modbus RTU) screw terminal MS/TP subnet terminator switch is located beside the port.