Thank you Andrew and Ken. I cobbled up an RJ11-to-RS232 (DB-9) cable and then with an USB-to-RS232 (DB-9) adapter updated the firmware to 3.39.
Ken, I did not get USB-to-Synscan cable with the mount, only the Synscan-to-mount cable. That's why I built one.
Now just need to add another power connector to the mount, the original is cracked as someone stepped on the power cable
