Can a reed switch be shared between KAM & M1?

fleetz

Active Member
Doing some planning. Have a door that will have a reed switch and also will have a door strike. Have to use the M1KAM access module.

Wondering if I can use the one reed switch which would be wired in parallel going to a zone input on the M1 and also the door open sense input on the KAM?

I assume that both inputs are high impedance and should work fine.

When the M1 is armed away the reed would be used monitor the door and activate an alarm should the door be forced open. When M1 is in disarmed mode it will monitor door status on the KAM.

The M1 and KAM are going to be mounted in the same 28" housing so cabling the reed to both inputs will be a breeze.

Can not see any catch in doing this but thought it worth floating it past you guys.

Regards,

Fleetz
 
You do not need any additional contacts or wiring. Wiring points in parallel will cause errant zone statuses.
 
The KAM provides a zone for this which is referenced by the KP address you program the KAM as. You land the DSM contact on the KAM and this is reported as that zone number. DSM timing is performed by the KAM (shunted when access granted) and a force is reported to the system as a burglary on that zone if the system is armed. A propped door is not reported to the system other than a local output at the KAM or if the M1 is armed and the shunt time expires.

A REX is necessary if you are intending on leaving the M1 armed and only granting access. The downside is if you use a REX PIR, the circuit is NC, so any system component failure would render the door unlocked (big design error by Elk here).
 
If you truly want to see 2 independent points trip, buy a DPDT contact, but it's unnecessary.
 
The open collectors on the KAM should be connected to the reader green/red LED's OR you would drive them via rules and other outputs to mimic a normal access control system (red=locked, green=unlocked).
 
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