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The RPS System provides an absolute location of RPS-equipped rolling stock.
JMRI can use that to set Sensors when a RPS transmitter is in a specific area, which can in turn be used to control other JMRI functions such as Signals, Routes and Logix.
An RPS Sensor is associated with an area bounded by a series of points and the lines
between those points.
There are two ways to create an RPS Sensor and define the area on the layout that it covers.
(0,0,0) (1,0,0) (1,1,0) (0,1,0)If you use the Sensor Table's "Add..." button to create a Sensor with the System Name
RS(0,0,0);(1,0,0);(1,1,0);(0,1,0)you'll get an RPS Sensor that shows "ACTIVE" when a Transmitter is present in that area, and "INACTIVE" otherwise.
The "R" means the RPS system, "S" means you're defining a Sensor, and the rest of the name defines the coordinates of the corners of the region to include in the Sensor. Each corner is specified by its X, Y and Z values, all grouped together with parentheses. The corners should be separated by semicolons; see the example above.
Once you've defined your Sensor, you can use the Tracking display to see if it's in the right place on your layout.
More information is available on the RPS Web Site.