If additional xdata-compatible sensor is connected to OIF411, it receives data from the additional xdata sensor, increments instrument number by 1, and sends this data immediately after receiving the CR.
Additional sensor data can be in any order (except that the OIF411 data always comes first), meaning that the instrument numbers are not in an ascending order. For example:
If additional sensor CFH is connected to OIF411, OIF411 sends
where LF = line feed, CR = carriage return.