BACKGROUND I have been pleased with my ISY994i ZW IR PRO running 4.9.0.  I managed to purchase a used ZW+ 500 module and upgraded my ISY to the latest 5.3.4 firmware.  Hopefully, this will provide me a better future upgrade path to an eISY.   SERIAL PLM TO USB ADAPTER I have not had any issues with my 2412S (knock on wood), but I thought I would try to connect to a USB to Serial adapter.   I had a USB to Cisco Serial console cable I could repurpose.  It contains the FTDI FT232 chip, sup