By saying devices and ports I would have to ask if you are trying to run things with IR flashers.
I have both wired 2 flashers to one port and also used a premade cable with 2 flashers on it with no problems.
If you are using serial control on any of the devices they each need their own port.
2 quick things off the top of my head is one try adjusting the flasher output on the NC-50
the other is to go into programming and on the nevo ecosystem tab click on the nc-50. this will pop up a grey box and make sure configure connections is checked and click next. Then you will see the list of all your devices. Make sure that both of those devices are assigned to a port.
One thing I have learned in this industry. It is easier to pull a wire than it is to push one.
