The R302 is a Modbus mixed-signal remote terminal unit (RTU). It’s ideal for demanding field and industrial relay-based applications requiring remote sensing, relay configuration, monitoring, and control with a high degree of input and output isolation and high-current output control capabilities.

Based on the Silicon Laboratories C8051F206 System-on-a-Chip processor, the Modbus mixed-signal RTU provides a low-cost complete solution for remote sensing and high-speed remote relay control with its integrated optoisolated digital inputs, analog inputs, Modbus communications protocol, high-power relay outputs, and serial communications options.

The R302 features eight high-speed optically isolated digital inputs with pulse counting, two analog inputs, and eight form 1C SPDT relay outputs. Digital input voltage levels can range from 3 to 40 V AC or DC. The output relay contacts are rated at 10 A/120 VAC and have snubber circuit protection. Field wiring is made easy with 5-mm pluggable screw terminal blocks.

The R302 operates at a supply voltage of 9 to 30 VDC. You can use it in a stand-alone mode as a programmable relay controller or connected via an RS-485 port to other RTUs to create an expanded remote network environment. The industrial I/O is accessed via 56 pluggable screw terminals and standard DE9 serial connectors.

The R302 Modbus mixed-signal RTU costs $269.

R2 Controls
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