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  4*TTL to F/O Converter SM
  4*TTL to F/O Converter MM
  Rugged, industrial-grade, Transistor-Transistor Logic (TTL) to Fiber Modems are professionally designed to interface with both commercial and industrial equipment, such as computers, PLC, RTU, SCADA and HMI. Whether your environment is in the field, factory, or fire command center, CLR Networks industry-proven TTL to fiber optiv-cal converter, CLR-TTL-4S, provides safe, reliable, simple, and cost-effective solutions for your distance-extension and device-protection applications