Hello,
I am needing help regarding the Arduino UNO. I am trying to send functions to a controller and then receive the data back from the controller to my Arduino UNO. The problem is my controller has an DB9 RS232 connection that uses (TX, RX, CTS, & RTS). So how exactly should I connect the Arduino UNO to my controller. My ultimate goal is to automate my controller by using the Arduino UNO. The Arduino UNO will automatically send functions (i.e The functions are: 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#) to my controller and my controller will automatically send back to the Arduino UNO with its responding data to that function (i.e. By sending 1# to the controller, the controller should respond back with it's voltage). Im very new to coding in Ardunio language. I originally wrote my code in C# and it worked fine but now I have to use an Arduino which isnt compatible with C#. Also, are there any additional code that I may need to add since I am trying to connect a DB9 RS232 to my Arduino UNO?
Thanks