Well on my portable, I have the PL set on both TX and RX(you always want to TX PL, to connect to the repeater). And if I turn the radio on, it will be silent until the correct tones are recieved. I can bypass the silent mode by pressing the monitor button, which allows me to hear all traffic from FC 911.
Basically its like this
Monitor off: Selective call
Monitor on: Monitor Mode
I'm sure this is confusing, because i get confused reading it myself.
But there has to be an AND/OR setting somewhere, but it probably isnt called that because its a Kenwood, I will look this up.