I built a serial test setup to add the code to handle tcp and http serial control, using a cheap serial board (http://www.amazon.com/uxcell®-MAX232CSE-Transfer-Converter-Module/dp/B00EJ9NAKA). I haven't hooked it to an actual device yet (don't have many left with serial ports, except for a TI103 X10 interface which is still working well and will eventually be switched from Homeseer to this device). It appears to working fine when connected to a USB-Serial COM port.