Calsense CS-2W-2ST 2-Wire 2‐Station Decoder. The Calsense 2-Wire 2‐Station Decoder, model CS-2W-2ST, operates up to 2‐solenoids using uniquely colored wires for each station. A single controller can operate up to 128 2‐wire stations, spread across a maximum of 70 physical Calsense 2‐Station Decoders. It is recommended that all wire runs between valves and Calsense 2‐Wire Decoders be direct pulls and have no splices, except at the Calsense 2-Wire Decoder location.