The ODW-621 is a fiber optic modem designed for point to point fiber optic applications between devices with an RS-232 interface.The ODW-621 is designed for harsh industrial usage as well as road or railway installations meeting industrial level EMC specifications and having a wide operating temperature range.The maximum distance of the fiber link depends on selected transceiver and fibertype.Fiber distances up to 80 km (50 miles) are possible using singlemode fiber.The unit has a retiming function that eliminates the problem of jitter and hence ensures reliable communications in all situations.It is possible to use the ODW-621 in conjunction with the ODW-631 to provide protocol conversion from RS-232 to RS-422/485 at either end of the optical link.


  • Retiming
  • Data rate up to 250 kbit/s
  • 9-position D-sub connector
  • Redundant power supply inputs
  • Status interface for fault indication
  • LED fault indication (Red)
  • Design for harsh environments
  • –40°C to +70°C operating temperature
  • Bi-di transceivers (MM)LC-2, (SM)LC20, LC-40, LC-60
  • LC-2 Multimode LC connectors, 5 km
  • LC-15 Singlemode LC connectors, 15 km
  • LC-40 Singlemode LC connectors, 40 km
  • LC-80 Singlemode LC connectors, 80 km

ODW-621 Diagram