RS232/485 over Fiber

RS232/485 over Fiber


The FRM220-Serial provides a fiber modem solution to extend asynchronous RS-232, RS-422 or RS-485 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 RS485/422 (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 RS485/422. When the FRM220-Serial/485 card is placed in the FRM220 rack with SNMP management, in-band management allows configuring and viewing the card and remote converter's status, type, version, fiber link status, data link status and alarms. When placed in a single slot chassis and used standalone without management, the card may be configured by DIP switches.


  • Extend asynchronous serial transmission up 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 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
  • Software selectable two wires (half duplex) or four wires (full duplex) RS-485

  PDF Download      Where To Buy

Contact Us

8F No. 60 Zhouzi St., Neihu District, Taipei 114, Taiwan
Tel : +886-2-2659-1021
Email :