Security Communications: Practical Intercom Applications

by Tim O'Leary
Created:

One-on-one authentication by means of verbal communication and often visual confirmation are the basis of high end security management.


No, it can only be programmed to dial one number after the six seconds of simulated dial tone has expired.  If someone needed to dial more than one number (in case of busy or no answer), we could use the K-1900-3 or C-4000 along with one of our “smart” dialers (model K-1900-30).

 

Once the call is placed, what happens? Can the person called remotely unlock the door?

Yes, once a visitor has called through to the “inside” person, the person inside can dial a one- or two-digit touch tone command to let the visitor in (and the command is programmable).

 

What are the other functional differences between the two controllers?

Both controllers operate in the same fashion with the main difference being in the number of entry points.  The K-1900-3 can only support one entry phone and the C-4000 supports up to four entry points and provides a separate door strike relay for each entry.  As mentioned earlier, the C-4000 also has an option for PC programming versus touch tone programming (K-1900-3 must be touch tone programmed).  The C-4000 can also support a card reader at each entry point for apartment building applications but card readers would not normally apply to this application.

 

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