problem with xset

[jd]

Dear all,
I have been trying to change the KB autorepeat
to a very slow rate, but does not work.
To wit:

$ xset r 2 500      
xset:  unknown option 500

usage: .....etc.....

So, the man page says the options for rate setting are:
[-r [keycode]]  [r [keycode]] [r {on|off}] [r rate delay [rate]]

So, I tried

$ xset r 2 delay 500                                       
xset:  unknown option delay

usage: .....etc.....

The Usage massage says:

    To turn auto-repeat off or on:
	-r [keycode]        r off
	 r [keycode]        r on
	 r rate [delay [rate]] <<<<<<< This is what I chose

So, a rate of 2 and a delay of 500
is not working!