I also use ACT, personally I prefer the ACT 2000 Access Control panel as it is so versitile easily upgraded at any time.
I enjoy the ACTwinpro2 software sooooo much, Virtually foolproof for the user and sometimes the installer

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How many other Access Control panels have an LCD Display and a slimline metal case and keys?.
If You had one demonstrated to You undoubtedly You would want one, Well it depends on taste and budget really, At a mere £550 exc VAT 17.5% their not cheap like cardlock or a surface mounted keypad ie: Bewator K42.
Using this example, Most surface mounted keypads could quite easily be comprimised using a screwdriver (flathead) to rip the housing from the faceplate and then apply a "U" shaped impliment such as a bent paperclip over the relay terminals to bridge the circuit, This of course could not be done with the independant controller positioned elsewhere on the secure side of the door.
If You have one of the cheap keypads You could always connect Your alarm system up to the "Tamper" teminals of Your keypad on the "Tamp" circuit or a NC alarm circuit and then by installing a 12v trigger relay module inside Your panel or a spare AUX programmable Relay, By connecting the "door relay" 12v + supply to the relay inside the alarm panel.
So in theory, when joe burgler removes the keypad from the faceplate; a tamper alarm condition occurs in the alarm panel which activates the bellbox in turn fires the relay module (as they are receiving the same 12v supply) which disconnect's the 12v power supply to the electric release therefore thwarting the attempts of the "EVIL Do'er"
in this I mean that joe burgler has left the premises in fear of being caught by onlookers attracted by the sound of the alarm being activated combined with the fact that the door remains secure.
I know what You are all thinking "how do You get in if the alarm is sounding?", Well, You wait 20 minutes until the bell cutout timer expires which release's the relay from NO to NC status; connecting the 12v circuit.
You may also have the added benefit of having an autodialler installed to your alarm to contact You if an alarm event does occur, Chances are You will return to Your property before the bell cutout timer expires!.
Remember to Always have a mechanical lock override on the system, After all, You would'nt want to get locked out would You?! in the event of a full power failure.
Imagine that!
That could only occur if You connected the relay to the strobe output and had no mechanical backup and had no other way into the property.
Or You could just fit a metal housed keyswitch to override the alarm panel's relay, But You would have to know what to do with all that stuff.

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Can You find a Flaw with this configuration?.
happy picking!
Kit Bear