When the tenant grants access to the visitor, the ERU relays are not changing state. The communication is only RS485 and USB?

• USB/RS485 module and Rs485 bus is connected together. The USB/RS485 Module connection to the PC should be one-to-one connected and not mutually connected to the main RS485 BUS;
  • Separate the two RS485 lines;

RS485 BUS is separate from the USB/RS485óPC connection.