I am trying to control the Relay board ER-16 in Labwindows/cvi , I have made a task in MAX but cannot call it to perform the desired function, I want to turn on and off the relay, I think it is not big of a task once you know how to do it and I am a novice. Any help will be really appreciated. I have one more question I need to send the following string "Atest Equipment" through the comport. It has to follow with a carriage return (x0d) Will string concetanate help? How to concetanate a CR with a string. One more thing when I need to read it will give me bytes and I need to read it for certain information. Any help is really appreciated