The WWP-IIRO-8 model features a pair of intelligent 16-channel digitalI/O units that communicate directly with each other. Each unit contains 8 Form C (SPDT) electromechanical relays and 8 optically isolated digital inputs. When an isolated input is toggled on one of the units it will cause the corresponding relay to switch on the other unit. No software or PC connection is required as this solution is self-contained and operates autonomously. The units are packaged in small, rugged,NEMA4 enclosures; suitable for remote installations in harsh atmospheric or industrial applications. The units can operate at distances up to 11.2km line-of-sight via a 900MHz wireless connection (up to 32km with optional high-gain antenna). The 8 isolated inputs can be driven by either DC sources of 3-31V or AC sources at frequencies of 40Hz to 10kHz and are not polarity sensitive. The device is useful for monitoring controllers and equipment status without needing an available auxiliary contact.