The RPI-32 is capable of monitoring a total of 32 alarm points with a current as low as .001 Amperes and as high as .50 Amperes.  It provides the conversion of an analog alarm signal into the proper format to be processed by the System 3505 Prism LX.  It also provides screw terminals to which the alarm pairs may be connected. A ribbon cable of up to 25 feet connects the first RPI-32 with the System 3505 Prism LX.  The System 3505 Prism LX can accommodate up to 15 additional RPI-32 interfaces, for a total of 512 alarm points. The second RPI-32 is connected to the first via a six-inch ribbon cable. The third RPI-32 is connected to the second, and so on, up to 16 in a daisy chain for a total of 512 inputs.  The System 3505 Prism LX can accommodate up to 64 RPI-32 interfaces corresponding to 2,048 alarm points.  

This expansion is possible at any time. The RPI-32 may be used within a chain of interfaces, in groups of 32 zones.  Interfaces may be mixed: EOL, Reverse Polarity, and Dry Contact inputs.