Help routing

[warren maxwell]

Im setting up a serial line connection and i am unable to ping because it says no host. How do i set up my base local address to be 192.168.2.1? The commands i am running are as follows,
slattach -h -l -n -s 19200 /dev/cuaa0
ifconfig sl0 192.168.2.2 192.168.2.3 up

Do i need to add a route command like this?
route add -net 192.168.2 192.168.2.0 255.255.255.0

Thanks for all the help in advance guys, much appreciated.
Bryan