ElanScan is a piece of software which interfaces with the Elan's ECU and can retrieve various real-time stats.
ElanScan is available for download from [ESM's website], information on obtaining or building suitable interfaces is also available at the same place.
The error log will report bad communications between the pc/ES and then car/ECU :
Comm port inactive - The wrong communications port has been selected for ElanScan. Check in the pc hardware configuration to see which ports are present. From bitter experience, this may also indicate a broken serial port!
Bad echo (sent: F4 56 01 B5: received: XXXXX)