ctrl-alt-del in serial console

[Darren]

I have several PE1650s with serial consoles attached.  According to the
docs, I should be able to send it an <ESC>R<ESC>r<ESC>R over the serial
line to deliver a ctrl-alt-del.  Has anyone been able to get this to work?

My escape key seems to do the correct thing in this terminal as <ESC>2
simulates the <F2> key, but I've not been able to get the c-a-d sequence
to work once.

Thanks.

--d