test if cc2531 is present on uart port

[npreiser]

Im using the cc2531 as a coordinator, and would like my application
to find the uart port the cc2531 by scanning all the com ports, and sending out a known
command to determine if its present on a given uart port.

Is this possible, is there a simple command I can send out, to determine if its on a port.
Like a ping... etc.

thanks

Nick,