The WiSI wireless sensor interface from Rugid Computer Inc., Olympia, WA, is a wireless, self-powered device that combines a radio and DA and control and is designed for rapid deployment to monitor and control remote sensors. There are three low-power models: one with an integrated solar panel and maintenance-free energy storage that can communicate for up to 1 week without sunlight; the other two run from an external 12 VDC power source. The WiSI comes standard with a 2.4 GHz radio, antenna or RP-SMA connector, 4 analog inputs, 4 digital inputs, 4 digital outputs, and 5 and 18 VDC instrument supplies that can source up to 25 mA for powering several sensors or a 4–20 mA loop. Standard features include a 0.25µA supply for powering RTDs and an RS-232 port.
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