Michel and BrianH,
Thanks for your help with confirming my suspicion about the PLM. After much more tinkering and jiggling of cables, I have given up. The PLM never gave a green light indication when plugged in with or without the cables attached. Only a brief red flash and then nothing. I have communicated the defect to Smarthome and have a replacement PLM on the way. Hopefully I can get past this first hurdle for home automation with a replacement PLM. And I hope that the reliability of the PLM device is actually good and not representative of the item I received.
Best regards,
Jim