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Overview

 
Always Observe local health, safety building and electrical code requirements and guidelines for manual material handling and installation!
 
The Proxitrol Multiplexed (Mux) Door monitoring and alarm system is, a very simple system.  Its task is to monitor the position of the door contacts.  Open, or Closed.    Whenever a change of state takes place - ie the door contact changes from Open -> Closed or Closed -> Open, the Mux reports that change of state to the Controlling device via its communication medium.  The defualt communcation medium is RS485. 
 
Globals Proxitrol Mux can be utilized with legacy  MSTC equipment allowing the new Mux must to co-exist with the legacy products.  Thankfully, the Axcys Software and the supporting electronics has been designed to be tolerant of these needs.  Thus, allowing a facility owner to grow their facility by adding alarmed units or update existing infrastructure when older equipment fails.
 
The Proxitrol Mux is available in 16 Channel (Door) increments, from 16 to 128 - making the maximum doors which can be monitored by a single mux 128 units.  Connecting the Mux to each door is accomplished by connecting a single wire from Channel x on the mux to one of the two wires on the door contact.  The second wire of the door contact becomes a Return for the door contact switch.  Any number of contact switches may be connected to a single return, however for debugging, it generally makes sense to limit this.  Normally 25 pair cable is used allowing up to 24 doors to be on one cable and a single Return wire, or 22 doors, utilizing two separate Return wires - one for each 11 doors.
 
In the case of a 128 Channel Mux, on the main board of the Proxitrol Mux there are 8 rows of 16 channels plus provision for 4 Returns.  These are contained in two 10 position pluggable connectors as shown in the the image below.    See subsequent sections of this subject for complete installation and wiring information.
 
Always plan the installiom to allow for extra channels on the multiplexer and extra conductors in the trunk line for service. These extra channels can be used when the drawings and *as-built* are not the same.  They can also be used to monitor man doors, emergency exits and other such areas you wish to monitor, but decided late in the game.