The Navionics WiSTAR RTU is an expandable, field-programmable industrial controller. Because the WiSTAR RTU is "software-intensive", the overall control system complexity is vastly reduced - featuring far fewer auxilliary devices along with simplified installation and wiring procedures. And as your control requirements evolve over time, additional analog, digital, and pulse inputs and outputs can be easily added, along with the programming logic needed to control them. In most cases, logic upgrades can be transmitted via modem from our facility to yours. Because each RTU has a single processor, the control and wireless communication processes are very tightly integrated. For example, at Jersey County (IL) Rural Water Company, the Grafton booster pump station bases its pump control decisions upon the water level in the remote Grafton Elevated Tank. However, when an extended power outage at the tank exceeded its battery backup reserve in June of 1999, the pump station had to "fly blind" for approximately 8 hours. Because the control process was always "aware" of the communication status, the pump station was able to automatically fail over smoothly into a "local pressure" control strategy - and thereby maintain water storage in the system.