Hi im having a problem with my MCB900 board. The program i am trying to run on it will not work correctly unless the board is connected to the pc via the serial connection. Is this a grounding issue and if so how do i fix it?
"Is this a grounding issue"
From the information given, it is impossible to say!
"how do i fix it?"
First, you need to identify exactly what "it" is!
If it is to do with grounding, you should get the same effect by using a cable with just the ground connected and no other signals. Do you?