The Allen-Bradley 1769-ECL is a left-end cap designed to terminate the communication bus of 1769 controllers, compatible with both Micrologix 1500 and Compactlogix systems. With a minimal bus current draw of 5 mA at 5V DC, the unit operates efficiently at altitudes up to 6562 feet and within temperatures ranging from 32 to 140 °F. Offering robust environmental resilience, it endures a non-operating temperature span of -40 to 185 °F, while maintaining a non-condensing relative humidity of 5 to 95%, and withstands vibrations up to 5 g and shock levels of 20 g when mounted.