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The FRM220-Serial provides a fiber converter solution to extend asynchronous RS-485 or RS-232 transmission distance up to 2km over multimode fiber or up to 120km over single mode fiber. The converter is equipped with multiple interface circuits for connection to RS-232 or RS485 (2 or 4 wire, full or half duplex). The FRM220-Serial secures data transmission over EMI resistant fiber at speeds up to 256kbps for RS-232 or up to 1024kbps for RS485. When the FRM220-Serial/485 card is placed in the FRM220 rack with SNMP management, in-band management allows viewing the card and remote converter's status, type, version, fiber link status, data link status and alarms. Both card and remote can be configured to enable or disable the port, reset the port and set the interface type.

Data Sheet


  • Extend asynchronous serial transmission from 2km to 120km over fiber
  • In-band network management via terminal, web or SNMP in FRM220-CH20 chassis
  • Software selectable data interface for RS-232/ 485
  • Software selectable two wires (half duplex) or four wires (full duplex) RS-485
  • Software selectable three or five wires RS-232
  • Speeds up to 256kbps for RS-232 (Async. mode)
  • Speeds up to 1Mbps for RS-485
  • Standalone RS232 console management via CH01M

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