Electro Standards Laboratories announces its new Model 4149 high speed ruggedized Fiber to RS485/422/232 interface converter. Typical operating speeds are 1.5 Mbps for RS232 to fiber conversion and 20 Mbps for RS485/422 to copper conversion. Model 4149 is designed to operate from -40°C to +85°C and features protection circuitry on all receivers and transmitters for both RS232 and RS485/422 interfaces.