Unlike the RFS6000/7000 controllers, the NX5500 does not have a dedicated management port/interface (me1). By default, IP address 192.168.0.1 is configured on VLAN 1 (management VLAN) for easy access after which you can change to DHCP or whatever IP address you'd like. You can also configure the zeroconfig IP address as a secondary IP address and/or add a secondary IP address to the controller.
There is no 'management' IP address for this controller per se.
Do you need help configuring an IP on a VLAN or assigning a secondary IP address?
Christoph S.