I am trying to implement this, but there are a few problems I am facing..
- Should I connect PIN 5 of DB9 to Earth ground or the negative pin of the source.
- When the serial Rx and Tx cables are attached to the MAX232, loopback in occurring. I have checked, there is no short in the breadboard. How is the data coming back? Yes the 'echo' is off in hyperterminal.