The FR-A840-22K-1: The serial port supports RS-232/422/485, which in practice means a two-wire RS-485 multi-drop for building management system (BMS) polling. Set the termination resistor and node address via the parameter bank; no external converter needed if the BAS speaks Modbus RTU over RS-485.
Certification and compliance
The drive carries CE, UL, and CUL markings and meets RoHS 6. That satisfies the common requirements for North American and European installations. The UL listing is specifically the file number for variable-speed drives; confirm the marking on the nameplate matches your local AHJ requirement.