Thank you very much for the links. They were extremly helpful. I have been working with DAQ's for instrumentation. I had to re design an ESS oven with a new controler and SCRS. Then came the software. Modbus was my hardest challenge to communicate to the Wat low controller. The lab wanted speacial features. And I was asked to write in Lab View. I have had less than one year experience with lab view. Coming from C to lab view was a little bit confusing.