Open port for one device

Occasionally I need to open a port to one device on my network so a programmer has access to a home automation controller. Previosly I was using the RVS4000 with no problems. I would just put my port number in and tell the router what IP address the  automation controller was at. I now have the RV180W and I've tried averything I can think of at this point. Any help would be gretaly appreciated!
Thank in advance

How did you do it on the rvs4000?
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