Ranch Systems LLC - Novato, CA -   The RX300 Remote Sensor and Relay Expansion Unit allows connection of a large number of remote sensors and controls to a single RM210 base stationor RS210 node via RS485 or RS232 cabling. It provides the flexibility to add sensing and control capability in a modular way - and when required –providing virtually unlimited room for expansion in any installation.

The RX300 unit also incorporates unique circuitry developed in partnership with the Irrometer Company to support the popular Watermark Soil Moisture Sensor. Each RX300 can connect 3 Watermark sensors.

For more information click here: http://www.ranchsystems.com/ssite/rs-datasheet-RX300-Aug2011.pdf