Thanks a lot for your reply. I dont have the name (modbus / profibus, etc) but the parameters are as mentioned. I thought this description 8 bits, odd parity, 1 stop, and 19.2 k baud would be sufficient to make the communication. The one thing that is not clear is addresses of the memory location and the header of the data. If I get this information would it be possible for the PLDuino (Atmega 2560) to act as a master and initiate the communication with the Lift controller which is a slave. I was thinking a code in the Atmega would do the job. Please advise. Thanks and best regards.