• The return value consists of 32 bits of unspecified data. This can be used by the sensor to indicate error states, sensor IDs, and so on. The data range is 0x00000000 to 0xFFFFFFFB inclusive. The value 0xFFFFFFFF specifies a sensor error. Values from 0xFFFFFFFC to 0xFFFFFFFE are not used.
• FRC 4-byte: FRC return value is the return value +4.