Elecrick

I am trying to upgrade from an ISY-26 to an ISY-99i Pro. I have not replaced my 2412S PLM. The cable from the PLM to the ISY-26 has a serial female connector to plug in the male jack on the ISY-26. My new ISY-99i Pro has a serial female jack which is not compatible with the female cable connector. I connected the PLM to the ISY-99i Pro with a cat5 cable. The unit powers up and I was able to restore my devices; however, the unit does not see status or communicate with the devices. I have swapped out cables, but the problem remains. I have also tried powering the unit separately. Is the ISY-99i compatible with the 2412S when using the RJ45 port? If so, any suggestions as to the cause of my problem?