... Modem, can extend the distance of RS232 device, easy to use, plug and play 1 Auto sense serial signal rate, zero delay ... : IN, OUT, GND Fiber signal:IN, OUT Working Asynchronism, point to point Adopt automatic send data control ,auto distinguish and control ... /SC/ST connector Working temperature: -25 to 70 Storage temperature: -40 to 85 Humidity: Reality humidity 5% to 95% Input power: 5-40VAC ...