Thank you Sir, this is exactly what I wanted to know. My worry was do I have to make any additional codes to establish the communication itself. Just to reassure my self your advise is the standard examples for communication would do the job. all that I need to know now is the format of the data in the lift controller. I hope this is correct. Thanks and best regards. By the way, the lift parametes are updated pereodically, for some it is 1 hour while for some others it is 1 minute