Model 4149 high speed, ruggedized Fiber-to-RS485/422/232 interface converter offers operating speeds of 1.5 Mbps for RS232 to fiber conversion and 20 Mbps for RS485/422 to fiber conversion. Operating from -40 to +85°C, it has protection circuitry on all receivers and transmitters for both RS232 and RS485/422 interfaces. Unit can be powered from wide input range of 9–36 Vdc, and from 4.5–9 and 18–72 Vdc voltage ranges for other models.