The example below demonstrates two serial ports connected to two arduino boards or xbee(s).
The Arduino on COM12 is running a program that transmits the text "Blink2". The Arduino on COM34 is running a program that transmits any text that is sent to it.
We see in the picture that COM34 is transmitting "sending back to visual studio" the text "Blink2" that it received from the Arduino on COM12
Note: Only ASCII data can be used with the "Serial Echo" facility. Future versions of the addin will support binary structures and instrument/graphing controls