The WCS2A/WCS3A PosiTrak™ Position Tracking System from Pepperl+Fuchs (Twinsburg, OH) consists of a U-shaped read head, a code rail and support hardware, and network and control interfaces. The read head optically scans a coded rail to determine a carrier mechanism's position. An internal microprocessor translates a 48 sender/receiver LED array status into a 19-bit code, providing 0.8-mm positional resolution over travel distances to 1,070 feet. Read heads require no calibration. The code rail is available in fiber-laminate or stainless steel, and provides a unique positional code every 0.8 mm of read head travel. Both are sold in customer-specified lengths. All rail types can be horizontally curved; fiber-laminate rails can be flexed for vertical bends. Control interfaces are available to convert R5-485 signals to most standard network protocols.