The invention relates to the use of an IO link for linking a field device to a master assembly. The method includes monitoring for an occurrence of a shake in a user equipment, detecting a shake, comparing the detected shake with a threshold value, evaluating characters within a pre-determined distance of a character entered by the user during the shake, selecting a replacement character from the evaluated characters and replacing the entered character with the replacement character. A multi-port extractive FTIR system is located in the factory to collect and detect gas sample of local area air using pipelines located in different areas and transmits the result of gas composition to the data server through the communication network.