I greatly appreciate your response, but I am still having no luck. This is Trendnet TU-S9 dongle (Prolific PL2303 chipset). This is the dongle I have used successfully with SX-20 previously.
Hi, I am a Crestron certified programmer, and like you have worked seemlessly using the SX-20 previously by connecting a USB to serial port adapter, and simply controlling via RS232 as with any device. I now have a Cisco Spark in front of me right no...