query about monitor expression

Hi,
I am very new to snmp. I have an urgent query.

Please let me know how monitor [OPTIONS] NAME EXPRESSION works. I have an
object systemVoltage which when get gets the value of system voltage. How do
I use this to send a trap whenever it falls outside 5 and +12V?

I guess the monitor expression will be

monitor -r 60 OID 5 12

I have a question about the same if the above holds. If voltage goes above
12, then after some time comes back within the range and goes back to above
12 again, will the trap be sent again?
I think it wont be sent, as in man page, its written that it has to cross
lower threshold before firing again. Can somebody please confirm this.

If it does not work this way, what should I do to make it fire this way as
below?
I want it this way:
OID value > 12---send trap, val--->8(value comes within range),
val--->14(more than 12) send trap
val > 12--->send trap, val ---->2(less than 5) --->send trap

Can I send different messages when it goes below and when it goes above?

Thanks a lot,
zix

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