make sure your system spits on com2
see e.g. xen and kvm slackware guests.
reach com2
vsp
get back to the ilo prompt
ESC-(
https://stivesso.blogspot.com/2012/02/hp-ilolinux-output-to-vsp-for-linux.html
http://blog.chrysocome.net/2013/05/proliant-virtual-serial-port.html