E-DI2-1W: ENVIROMUX digital input expander 

used to connect two dry contact sensors to ENVIROMUX 1W 1-wire daisy-chain configuration 

• Each E-DI2-1W counts as two single reading sensors
• Up to 12 E-DI2-1W can be connected to the E-1W
• Maximum cable length: 600 feet (183 m)
• Distance between dry contact sensors and E-DI2-1W does not count toward the 600 feet 1-wire daisy-chain limitation
• Sensors can be extended up to 1,000 feet from an E-DI2-1W
• Compatible with and powered by ENVIROMUX 1W