Why not connect a console cable directly to the switch and view the config ? trying to guess the IP would be difficult especially if someone has changed the config.
By default Cisco Switches do not have an IP address to begin with.
1 stop bit
Use the Serial console cable provided by Cisco..
will allow you to connect directly to the Switch using the serial port on your laptop via the shell
is a X11 based communications package that should work as well
From a windows machine I would use terraterm Pro as the application