G3 Technologies in Louisburg, Kansas has a line of remote I/O that looks interesting.  The entry level product is a the Model G301, which provides 36 I/O points in a bare-board package.

From the web site: The Model G301 RIO (Remote I/O) is a low cost solution for I/O expansion and remote I/O requirements in SCADA and Process Control applications.  It provides 24 Digital Inputs, 4 Analog Inputs, and 8 Digital (FET) Outputs.  See pdf data sheet for details, and call G3 Technologies for pricing.

The G301 uses standard RS485 serial data communications with Modbus Slave protocol.  It is especially suited for applications requiring low power and/or environmental tolerance, including SOLAR applications.  It also makes a great local or remote “Modbus End Device” to gather data for a PLC or RTU acting as a Data Concentrator.

M2M Data Corporations’s new Aquavx water/waste water services and hardware are now available for sale online through its eCommerce store

Aquavx is an alternative to traditional SCADA. We use cellular and satellite based communication technologies instead of using expensive private radio networks. Generally it costs less than the phone line for a traditional autodialer and provides reports, notifications, and analytics without pricey customization.

EnOcean (Boston, MA) provides technology for what they call self-powered, green, smart, wireless sensors. The basic idea is to use the energy associated with say a mechanical movement such as a switch position change to transmit wireless signals over a distance of up to 1000 feet. From the web site: “EnOcean’™s unique combination of miniaturized energy harvesting modules with ultra low power radio technology is the basis for innovative maintenance free wireless sensors. EnOcean technology adds unparalleled flexibility at lowest investment and operational cost.”