run /usr/sbin/pcp2sh and do this:
> help(Switch_0027)
Switch_0027 help:
-------
METHODS
get_state
set_state
-------
ERRORS
switch_failure
> Switch_0027[1]:set_state(0,0)
switch_0027:state_change fired at peripheral address 0x0408
0
{error_id=0}
> Switch_0027[1]:set_state(0,1)
switch_0027:state_change fired at peripheral address 0x0408
0
{error_id=0}
>