Finally have the solution....
Was told that SmartHome in their "lack of" wisdom, used an ethernet cable for their PLMs but it's not ethernet at all, it is serial. So UDevices jerry-rigged an ethernet port on their 994 so it would accept the serial data from what looks like an ethernet cable.
The solution is to buy the (total=$38) serial adapter from UD which I will do. Not happy about it but I guess the only thing I can fault UD on is that this is not blatantly stated in the instructions. Yes, they do mention that a serial PLM needs the adapter but I never bothered to check the model number of my PLM since I was looking at an ethernet cable.